- 增加 FreeSql.Provider.Dameng 基于 DmProvider Ado.net 访问达梦数据库；#155

Examples/orm_vs/Program.cs

@@ -46,8 +46,23 @@ namespace orm_vs
             }
         }
 
+        static Lazy<IFreeSql> damengLazy = new Lazy<IFreeSql>(() => new FreeSql.FreeSqlBuilder()
+            .UseConnectionString(FreeSql.DataType.Dameng, "server=127.0.0.1;port=5236;user id=2user;password=123456789;database=2user")
+             //.UseConnectionFactory(FreeSql.DataType.Dameng, () => new Dm.DmConnection("data source=127.0.0.1:5236;user id=2user;password=123456789;Pooling=true;Max Pool Size=2"))
+             .UseAutoSyncStructure(true)
+            .UseNameConvert(FreeSql.Internal.NameConvertType.ToUpper)
+            //.UseNoneCommandParameter(true)
+
+            .UseMonitorCommand(
+                cmd => Trace.WriteLine(cmd.CommandText), //监听SQL命令对象，在执行前
+                (cmd, traceLog) => Console.WriteLine(traceLog))
+            .Build());
+        public static IFreeSql dameng => damengLazy.Value;
+
         static void Main(string[] args)
         {
+            dameng.Select<Song>().ToList();
+
             var testlist1 = fsql.Select<Song>().OrderBy(a => a.Id).ToList();
             var testlist2 = new List<Song>();
             fsql.Select<Song>().OrderBy(a => a.Id).ToChunk(0, list =>

Examples/orm_vs/orm_vs.csproj

@@ -13,6 +13,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\..\FreeSql\FreeSql.csproj" />
+    <ProjectReference Include="..\..\Providers\FreeSql.Provider.Dameng\FreeSql.Provider.Dameng.csproj" />
     <ProjectReference Include="..\..\Providers\FreeSql.Provider.MySql\FreeSql.Provider.MySql.csproj" />
     <ProjectReference Include="..\..\Providers\FreeSql.Provider.SqlServer\FreeSql.Provider.SqlServer.csproj" />
   </ItemGroup>

Examples/orm_vs_net40/Program.cs

@@ -33,8 +33,24 @@ namespace orm_vs
         //    });
         //}
 
+        static Lazy<IFreeSql> damengLazy = new Lazy<IFreeSql>(() => new FreeSql.FreeSqlBuilder()
+            .UseConnectionString(FreeSql.DataType.Dameng, "server=127.0.0.1;port=5236;user id=2user;password=123456789;database=2user")
+             //.UseConnectionFactory(FreeSql.DataType.Dameng, () => new Dm.DmConnection("data source=127.0.0.1:5236;user id=2user;password=123456789;Pooling=true;Max Pool Size=2"))
+             .UseAutoSyncStructure(true)
+            .UseNameConvert(FreeSql.Internal.NameConvertType.ToUpper)
+            //.UseNoneCommandParameter(true)
+
+            .UseMonitorCommand(
+                cmd => Trace.WriteLine(cmd.CommandText), //监听SQL命令对象，在执行前
+                (cmd, traceLog) => Console.WriteLine(traceLog))
+            .Build());
+        public static IFreeSql dameng => damengLazy.Value;
+
         static void Main(string[] args)
         {
+            dameng.Select<Song>().ToList();
+
+
             fsql.CodeFirst.SyncStructure(typeof(Song), typeof(Song_tag), typeof(Tag));
             //sugar.CodeFirst.InitTables(typeof(Song), typeof(Song_tag), typeof(Tag));
             //sugar创建表失败：SqlSugar.SqlSugarException: Sequence contains no elements

Examples/orm_vs_net40/orm_vs_net40.csproj

@@ -49,6 +49,10 @@
       <Project>{af9c50ec-6eb6-494b-9b3b-7edba6fd0ebb}</Project>
       <Name>FreeSql</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\Providers\FreeSql.Provider.Dameng\FreeSql.Provider.Dameng.csproj">
+      <Project>{e74d90e8-1cbc-4677-817b-1ca05ab97937}</Project>
+      <Name>FreeSql.Provider.Dameng</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\Providers\FreeSql.Provider.MySql\FreeSql.Provider.MySql.csproj">
       <Project>{28c6a39c-7ae7-4210-b7b0-0970216637a8}</Project>
       <Name>FreeSql.Provider.MySql</Name>

FreeSql.DbContext/FreeSql.DbContext.xml

@@ -120,13 +120,6 @@
             清空状态数据
             </summary>
         </member>
-        <member name="M:FreeSql.DbSet`1.RemoveAsync(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">
-            <summary>
-            根据 lambda 条件删除数据
-            </summary>
-            <param name="predicate"></param>
-            <returns></returns>
-        </member>
         <member name="M:FreeSql.DbSet`1.Add(`0)">
             <summary>
             添加
@@ -221,15 +214,6 @@
             </summary>
             <returns></returns>
         </member>
-        <member name="M:FreeSql.FreeSqlRepositoryDependencyInjection.AddFreeRepository(Microsoft.Extensions.DependencyInjection.IServiceCollection,System.Action{FreeSql.FluentDataFilter},System.Reflection.Assembly[])">
-            <summary>
-            批量注入 Repository，可以参考代码自行调整
-            </summary>
-            <param name="services"></param>
-            <param name="globalDataFilter"></param>
-            <param name="assemblies"></param>
-            <returns></returns>
-        </member>
         <member name="M:FreeSql.IBaseRepository.AsType(System.Type)">
             <summary>
             动态Type，在使用 Repository&lt;object&gt; 后使用本方法，指定实体类型

FreeSql.Tests/FreeSql.Tests/Dameng/Curd/DamengDeleteTest.cs

@@ -0,0 +1,106 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.Dameng
+{
+    public class DamengDeleteTest
+    {
+
+        IDelete<Topic> delete => g.dameng.Delete<Topic>(); //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+        [Table(Name = "tb_topic22211")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int? Clicks { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+
+        [Fact]
+        public void Dywhere()
+        {
+            Assert.Null(g.dameng.Delete<Topic>().ToSql());
+            var sql = g.dameng.Delete<Topic>(new[] { 1, 2 }).ToSql();
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (\"ID\" = 1 OR \"ID\" = 2)", sql);
+
+            sql = g.dameng.Delete<Topic>(new Topic { Id = 1, Title = "test" }).ToSql();
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (\"ID\" = 1)", sql);
+
+            sql = g.dameng.Delete<Topic>(new[] { new Topic { Id = 1, Title = "test" }, new Topic { Id = 2, Title = "test" } }).ToSql();
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (\"ID\" = 1 OR \"ID\" = 2)", sql);
+
+            sql = g.dameng.Delete<Topic>(new { id = 1 }).ToSql();
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (\"ID\" = 1)", sql);
+
+            sql = g.dameng.Delete<MultiPkTopic>(new[] { new { Id1 = 1, Id2 = 10 }, new { Id1 = 2, Id2 = 20 } }).ToSql();
+            Assert.Equal("DELETE FROM \"MULTIPKTOPIC\" WHERE (\"ID1\" = 1 AND \"ID2\" = 10 OR \"ID1\" = 2 AND \"ID2\" = 20)", sql);
+        }
+        class MultiPkTopic
+        {
+            [Column(IsPrimary = true)]
+            public int Id1 { get; set; }
+            [Column(IsPrimary = true)]
+            public int Id2 { get; set; }
+            public int Clicks { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+
+        [Fact]
+        public void Where()
+        {
+            var sql = delete.Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (\"ID\" = 1)", sql);
+
+            sql = delete.Where("id = :id", new { id = 1 }).ToSql().Replace("\r\n", "");
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (id = :id)", sql);
+
+            var item = new Topic { Id = 1, Title = "newtitle" };
+            sql = delete.Where(item).ToSql().Replace("\r\n", "");
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (\"ID\" = 1)", sql);
+
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100 });
+
+            sql = delete.Where(items).ToSql().Replace("\r\n", "");
+            Assert.Equal("DELETE FROM \"TB_TOPIC22211\" WHERE (\"ID\" IN (1,2,3,4,5,6,7,8,9,10))", sql);
+        }
+        [Fact]
+        public void ExecuteAffrows()
+        {
+
+            var id = g.dameng.Insert<Topic>(new Topic { Title = "xxxx", CreateTime = DateTime.Now }).ExecuteIdentity();
+            Assert.Equal(1, delete.Where(a => a.Id == id).ExecuteAffrows());
+        }
+        [Fact]
+        public void ExecuteDeleted()
+        {
+
+            //var item = g.dameng.Insert<Topic>(new Topic { Title = "xxxx", CreateTime = DateTime.Now }).ExecuteInserted();
+            //Assert.Equal(item[0].Id, delete.Where(a => a.Id == item[0].Id).ExecuteDeleted()[0].Id);
+        }
+
+        [Fact]
+        public void AsTable()
+        {
+            Assert.Null(g.dameng.Delete<Topic>().ToSql());
+            var sql = g.dameng.Delete<Topic>(new[] { 1, 2 }).AsTable(a => "TopicAsTable").ToSql();
+            Assert.Equal("DELETE FROM \"TOPICASTABLE\" WHERE (\"ID\" = 1 OR \"ID\" = 2)", sql);
+
+            sql = g.dameng.Delete<Topic>(new Topic { Id = 1, Title = "test" }).AsTable(a => "TopicAsTable").ToSql();
+            Assert.Equal("DELETE FROM \"TOPICASTABLE\" WHERE (\"ID\" = 1)", sql);
+
+            sql = g.dameng.Delete<Topic>(new[] { new Topic { Id = 1, Title = "test" }, new Topic { Id = 2, Title = "test" } }).AsTable(a => "TopicAsTable").ToSql();
+            Assert.Equal("DELETE FROM \"TOPICASTABLE\" WHERE (\"ID\" = 1 OR \"ID\" = 2)", sql);
+
+            sql = g.dameng.Delete<Topic>(new { id = 1 }).AsTable(a => "TopicAsTable").ToSql();
+            Assert.Equal("DELETE FROM \"TOPICASTABLE\" WHERE (\"ID\" = 1)", sql);
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/Curd/DamengInsertTest.cs

@@ -0,0 +1,278 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.Dameng
+{
+    public class DamengInsertTest
+    {
+
+        IInsert<Topic> insert => g.dameng.Insert<Topic>(); //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+        [Table(Name = "tb_topic_insert")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int? Clicks { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+
+        [Fact]
+        public void AppendData()
+        {
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100, CreateTime = DateTime.Parse("2019-09-19 22:25:38.697071") });
+
+            var data = new List<object>();
+            var sql = insert.AppendData(items.First()).ToSql();
+            Assert.Equal("INSERT INTO \"TB_TOPIC_INSERT\"(\"CLICKS\", \"TITLE\", \"CREATETIME\") VALUES(0, 'newtitle0', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+
+            sql = insert.AppendData(items).ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(0, 'newtitle0', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(100, 'newtitle1', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(200, 'newtitle2', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(300, 'newtitle3', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(400, 'newtitle4', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(500, 'newtitle5', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(600, 'newtitle6', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(700, 'newtitle7', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(800, 'newtitle8', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(900, 'newtitle9', to_timestamp('2019-09-19 22:25:38.697071','YYYY-MM-DD HH24:MI:SS.FF6'))
+ SELECT 1 FROM DUAL", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+
+            sql = insert.AppendData(items).InsertColumns(a => a.Title).ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle0')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle1')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle2')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle3')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle4')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle5')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle6')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle7')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle8')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle9')
+ SELECT 1 FROM DUAL", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+
+            sql = insert.AppendData(items).IgnoreColumns(a => a.CreateTime).ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(0, 'newtitle0')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(100, 'newtitle1')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(200, 'newtitle2')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(300, 'newtitle3')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(400, 'newtitle4')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(500, 'newtitle5')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(600, 'newtitle6')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(700, 'newtitle7')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(800, 'newtitle8')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(900, 'newtitle9')
+ SELECT 1 FROM DUAL", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+        }
+
+        [Fact]
+        public void InsertColumns()
+        {
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100, CreateTime = DateTime.Now });
+
+            var data = new List<object>();
+            var sql = insert.AppendData(items).InsertColumns(a => a.Title).ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle0')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle1')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle2')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle3')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle4')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle5')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle6')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle7')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle8')
+INTO ""TB_TOPIC_INSERT""(""TITLE"") VALUES('newtitle9')
+ SELECT 1 FROM DUAL", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+
+            sql = insert.AppendData(items).InsertColumns(a => new { a.Title, a.Clicks }).ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(0, 'newtitle0')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(100, 'newtitle1')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(200, 'newtitle2')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(300, 'newtitle3')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(400, 'newtitle4')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(500, 'newtitle5')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(600, 'newtitle6')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(700, 'newtitle7')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(800, 'newtitle8')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(900, 'newtitle9')
+ SELECT 1 FROM DUAL", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+        }
+        [Fact]
+        public void IgnoreColumns()
+        {
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100, CreateTime = DateTime.Now });
+
+            var data = new List<object>();
+            var sql = insert.AppendData(items).IgnoreColumns(a => a.CreateTime).ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(0, 'newtitle0')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(100, 'newtitle1')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(200, 'newtitle2')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(300, 'newtitle3')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(400, 'newtitle4')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(500, 'newtitle5')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(600, 'newtitle6')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(700, 'newtitle7')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(800, 'newtitle8')
+INTO ""TB_TOPIC_INSERT""(""CLICKS"", ""TITLE"") VALUES(900, 'newtitle9')
+ SELECT 1 FROM DUAL", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+
+            sql = insert.AppendData(items).IgnoreColumns(a => new { a.Title, a.CreateTime }).ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(0)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(100)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(200)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(300)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(400)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(500)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(600)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(700)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(800)
+INTO ""TB_TOPIC_INSERT""(""CLICKS"") VALUES(900)
+ SELECT 1 FROM DUAL", sql);
+            data.Add(insert.AppendData(items.First()).ExecuteIdentity());
+
+            g.dameng.Delete<TopicIgnore>().Where("1=1").ExecuteAffrows();
+            var itemsIgnore = new List<TopicIgnore>();
+            for (var a = 0; a < 2072; a++) itemsIgnore.Add(new TopicIgnore { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100, CreateTime = DateTime.Now });
+            g.dameng.Insert<TopicIgnore>().AppendData(itemsIgnore).IgnoreColumns(a => new { a.Title }).ExecuteAffrows();
+            Assert.Equal(2072, itemsIgnore.Count);
+            Assert.Equal(2072, g.dameng.Select<TopicIgnore>().Where(a => a.Title == null).Count());
+        }
+        [Table(Name = "tb_topicICs")]
+        class TopicIgnore
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int Clicks { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+        [Fact]
+        public void ExecuteAffrows()
+        {
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100, CreateTime = DateTime.Now });
+
+            Assert.Equal(1, insert.AppendData(items.First()).ExecuteAffrows());
+            Assert.Equal(10, insert.AppendData(items).ExecuteAffrows());
+        }
+        [Fact]
+        public void ExecuteIdentity()
+        {
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100, CreateTime = DateTime.Now });
+
+            Assert.NotEqual(0, insert.AppendData(items.First()).ExecuteIdentity());
+        }
+        [Fact]
+        public void ExecuteInserted()
+        {
+            //var items = new List<Topic>();
+            //for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100, CreateTime = DateTime.Now });
+
+            //var items2 = insert.AppendData(items).ExecuteInserted();
+        }
+
+        [Fact]
+        public void AsTable()
+        {
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newTitle{a}", Clicks = a * 100 });
+
+            var sql = insert.AppendData(items.First()).AsTable(a => "Topic_InsertAsTable").ToSql();
+            Assert.Equal("INSERT INTO \"TOPIC_INSERTASTABLE\"(\"CLICKS\", \"TITLE\", \"CREATETIME\") VALUES(0, 'newTitle0', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))", sql);
+
+            sql = insert.AppendData(items).AsTable(a => "Topic_InsertAsTable").ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(0, 'newTitle0', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(100, 'newTitle1', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(200, 'newTitle2', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(300, 'newTitle3', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(400, 'newTitle4', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(500, 'newTitle5', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(600, 'newTitle6', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(700, 'newTitle7', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(800, 'newTitle8', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"", ""CREATETIME"") VALUES(900, 'newTitle9', to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+ SELECT 1 FROM DUAL", sql);
+
+            sql = insert.AppendData(items).IgnoreColumns(a => a.Title).AsTable(a => "Topic_InsertAsTable").ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(0, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(100, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(200, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(300, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(400, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(500, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(600, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(700, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(800, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""CREATETIME"") VALUES(900, to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6'))
+ SELECT 1 FROM DUAL", sql);
+
+            sql = insert.AppendData(items).IgnoreColumns(a => new { a.Clicks, a.CreateTime }).AsTable(a => "Topic_InsertAsTable").ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle0')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle1')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle2')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle3')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle4')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle5')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle6')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle7')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle8')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle9')
+ SELECT 1 FROM DUAL", sql);
+
+            sql = insert.AppendData(items).InsertColumns(a => a.Title).AsTable(a => "Topic_InsertAsTable").ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle0')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle1')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle2')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle3')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle4')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle5')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle6')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle7')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle8')
+INTO ""TOPIC_INSERTASTABLE""(""TITLE"") VALUES('newTitle9')
+ SELECT 1 FROM DUAL", sql);
+
+            sql = insert.AppendData(items).InsertColumns(a => new { a.Title, a.Clicks }).AsTable(a => "Topic_InsertAsTable").ToSql();
+            Assert.Equal(@"INSERT ALL
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(0, 'newTitle0')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(100, 'newTitle1')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(200, 'newTitle2')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(300, 'newTitle3')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(400, 'newTitle4')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(500, 'newTitle5')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(600, 'newTitle6')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(700, 'newTitle7')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(800, 'newTitle8')
+INTO ""TOPIC_INSERTASTABLE""(""CLICKS"", ""TITLE"") VALUES(900, 'newTitle9')
+ SELECT 1 FROM DUAL", sql);
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/Curd/DamengUpdateTest.cs

@@ -0,0 +1,173 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using Xunit;
+
+namespace FreeSql.Tests.Dameng
+{
+    public class DamengUpdateTest
+    {
+        IUpdate<Topic> update => g.dameng.Update<Topic>();
+
+        [Table(Name = "tb_topic")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int? Clicks { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+
+        [Fact]
+        public void Dywhere()
+        {
+            Assert.Null(g.dameng.Update<Topic>().ToSql());
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='test' \r\nWHERE (\"ID\" = 1 OR \"ID\" = 2)", g.dameng.Update<Topic>(new[] { 1, 2 }).SetRaw("title='test'").ToSql());
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='test1' \r\nWHERE (\"ID\" = 1)", g.dameng.Update<Topic>(new Topic { Id = 1, Title = "test" }).SetRaw("title='test1'").ToSql());
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='test1' \r\nWHERE (\"ID\" = 1 OR \"ID\" = 2)", g.dameng.Update<Topic>(new[] { new Topic { Id = 1, Title = "test" }, new Topic { Id = 2, Title = "test" } }).SetRaw("title='test1'").ToSql());
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='test1' \r\nWHERE (\"ID\" = 1)", g.dameng.Update<Topic>(new { id = 1 }).SetRaw("title='test1'").ToSql());
+        }
+
+        [Fact]
+        public void SetSource()
+        {
+            var sql = update.SetSource(new Topic { Id = 1, Title = "newtitle" }).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = NULL, \"TITLE\" = 'newtitle', \"CREATETIME\" = to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHERE (\"ID\" = 1)", sql);
+
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100 });
+            items[0].Clicks = null;
+
+            sql = update.SetSource(items).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = CASE \"ID\" WHEN 1 THEN NULL WHEN 2 THEN 100 WHEN 3 THEN 200 WHEN 4 THEN 300 WHEN 5 THEN 400 WHEN 6 THEN 500 WHEN 7 THEN 600 WHEN 8 THEN 700 WHEN 9 THEN 800 WHEN 10 THEN 900 END, \"TITLE\" = CASE \"ID\" WHEN 1 THEN 'newtitle0' WHEN 2 THEN 'newtitle1' WHEN 3 THEN 'newtitle2' WHEN 4 THEN 'newtitle3' WHEN 5 THEN 'newtitle4' WHEN 6 THEN 'newtitle5' WHEN 7 THEN 'newtitle6' WHEN 8 THEN 'newtitle7' WHEN 9 THEN 'newtitle8' WHEN 10 THEN 'newtitle9' END, \"CREATETIME\" = CASE \"ID\" WHEN 1 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 2 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 3 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 4 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 5 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 6 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 7 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 8 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 9 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHEN 10 THEN to_timestamp('0001-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') END WHERE (\"ID\" IN (1,2,3,4,5,6,7,8,9,10))", sql);
+
+            sql = update.SetSource(items).IgnoreColumns(a => new { a.Clicks, a.CreateTime }).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"TITLE\" = CASE \"ID\" WHEN 1 THEN 'newtitle0' WHEN 2 THEN 'newtitle1' WHEN 3 THEN 'newtitle2' WHEN 4 THEN 'newtitle3' WHEN 5 THEN 'newtitle4' WHEN 6 THEN 'newtitle5' WHEN 7 THEN 'newtitle6' WHEN 8 THEN 'newtitle7' WHEN 9 THEN 'newtitle8' WHEN 10 THEN 'newtitle9' END WHERE (\"ID\" IN (1,2,3,4,5,6,7,8,9,10))", sql);
+
+            sql = update.SetSource(items).Set(a => a.CreateTime, new DateTime(2020, 1, 1)).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CREATETIME\" = to_timestamp('2020-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHERE (\"ID\" IN (1,2,3,4,5,6,7,8,9,10))", sql);
+
+            if (g.dameng.Select<ts_source_mpk>().Where(a => a.id1 == 1 && a.id2 == 7).Any() == false)
+                g.dameng.Insert(new ts_source_mpk { id1 = 1, id2 = 7 }).ExecuteAffrows();
+            if (g.dameng.Select<ts_source_mpk>().Where(a => a.id1 == 1 && a.id2 == 8).Any() == false)
+                g.dameng.Insert(new ts_source_mpk { id1 = 1, id2 = 8 }).ExecuteAffrows();
+
+            sql = g.dameng.Update<ts_source_mpk>().SetSource(new[] {
+                new ts_source_mpk { id1 = 1, id2 = 7, xx = "a1" },
+                new ts_source_mpk { id1 = 1, id2 = 8, xx = "b122" }
+            }).NoneParameter().ToSql().Replace("\r\n", "");
+            g.dameng.Update<ts_source_mpk>().SetSource(new[] {
+                new ts_source_mpk { id1 = 1, id2 = 7, xx = "a1" },
+                new ts_source_mpk { id1 = 1, id2 = 8, xx = "b122" }
+            }).NoneParameter().ExecuteAffrows();
+            var testlist = g.dameng.Select<ts_source_mpk>().ToList();
+        }
+        public class ts_source_mpk
+        {
+            [Column(IsPrimary = true)]
+            public int id1 { get; set; }
+            [Column(IsPrimary = true)]
+            public int id2 { get; set; }
+            public string xx { get; set; }
+        }
+        [Fact]
+        public void IgnoreColumns()
+        {
+            var sql = update.SetSource(new Topic { Id = 1, Title = "newtitle" }).IgnoreColumns(a => new { a.Clicks, a.CreateTime }).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"TITLE\" = 'newtitle' WHERE (\"ID\" = 1)", sql);
+        }
+        [Fact]
+        public void UpdateColumns()
+        {
+            var sql = update.SetSource(new Topic { Id = 1, Title = "newtitle" }).UpdateColumns(a => a.Title).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"TITLE\" = 'newtitle' WHERE (\"ID\" = 1)", sql);
+        }
+        [Fact]
+        public void Set()
+        {
+            var sql = update.Where(a => a.Id == 1).Set(a => a.Title, "newtitle").ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"TITLE\" = 'newtitle' WHERE (\"ID\" = 1)", sql);
+
+            sql = update.Where(a => a.Id == 1).Set(a => a.Title, "newtitle").Set(a => a.CreateTime, new DateTime(2020, 1, 1)).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"TITLE\" = 'newtitle', \"CREATETIME\" = to_timestamp('2020-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') WHERE (\"ID\" = 1)", sql);
+
+            sql = update.Set(a => a.Clicks * 10 / 1).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = trunc(nvl(\"CLICKS\", 0) * 10 / 1) WHERE (\"ID\" = 1)", sql);
+
+            sql = update.Set(a => a.Id - 10).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"ID\" = (\"ID\" - 10) WHERE (\"ID\" = 1)", sql);
+
+            int incrv = 10;
+            sql = update.Set(a => a.Clicks * incrv / 1).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = trunc(nvl(\"CLICKS\", 0) * 10 / 1) WHERE (\"ID\" = 1)", sql);
+
+            sql = update.Set(a => a.Id - incrv).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"ID\" = (\"ID\" - 10) WHERE (\"ID\" = 1)", sql);
+
+            sql = update.Set(a => a.Clicks == a.Clicks * 10 / 1).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = trunc(\"CLICKS\" * 10 / 1) WHERE (\"ID\" = 1)", sql);
+
+            var dt2000 = DateTime.Parse("2000-01-01");
+            sql = update.Set(a => a.Clicks == (a.CreateTime > dt2000 ? 1 : 2)).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = case when \"CREATETIME\" > to_timestamp('2000-01-01 00:00:00.000000','YYYY-MM-DD HH24:MI:SS.FF6') then 1 else 2 end WHERE (\"ID\" = 1)", sql);
+
+            sql = update.Set(a => a.Id == 10).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"ID\" = 10 WHERE (\"ID\" = 1)", sql);
+        }
+        [Fact]
+        public void SetRaw()
+        {
+            var sql = update.Where(a => a.Id == 1).SetRaw("clicks = clicks + ?", new { incrClick = 1 }).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET clicks = clicks + ? WHERE (\"ID\" = 1)", sql);
+        }
+        [Fact]
+        public void SetDto()
+        {
+            var sql = update.SetDto(new { clicks = 1, title = "xxx" }).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = 1, \"TITLE\" = 'xxx' WHERE (\"ID\" = 1)", sql);
+
+            sql = update.SetDto(new Dictionary<string, object> { ["clicks"] = 1, ["title"] = "xxx" }).Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET \"CLICKS\" = 1, \"TITLE\" = 'xxx' WHERE (\"ID\" = 1)", sql);
+        }
+        [Fact]
+        public void Where()
+        {
+            var sql = update.Where(a => a.Id == 1).SetRaw("title='newtitle'").ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='newtitle' WHERE (\"ID\" = 1)", sql);
+
+            sql = update.Where("id = ?", new { id = 1 }).SetRaw("title='newtitle'").ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='newtitle' WHERE (id = ?)", sql);
+
+            var item = new Topic { Id = 1, Title = "newtitle" };
+            sql = update.Where(item).SetRaw("title='newtitle'").ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='newtitle' WHERE (\"ID\" = 1)", sql);
+
+            var items = new List<Topic>();
+            for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100 });
+            sql = update.Where(items).SetRaw("title='newtitle'").ToSql().Replace("\r\n", "");
+            Assert.Equal("UPDATE \"TB_TOPIC\" SET title='newtitle' WHERE (\"ID\" IN (1,2,3,4,5,6,7,8,9,10))", sql);
+        }
+        [Fact]
+        public void ExecuteAffrows()
+        {
+
+        }
+        [Fact]
+        public void ExecuteUpdated()
+        {
+
+        }
+
+        [Fact]
+        public void AsTable()
+        {
+            Assert.Null(g.dameng.Update<Topic>().ToSql());
+            Assert.Equal("UPDATE \"TB_TOPICASTABLE\" SET title='test' \r\nWHERE (\"ID\" = 1 OR \"ID\" = 2)", g.dameng.Update<Topic>(new[] { 1, 2 }).SetRaw("title='test'").AsTable(a => "tb_topicAsTable").ToSql());
+            Assert.Equal("UPDATE \"TB_TOPICASTABLE\" SET title='test1' \r\nWHERE (\"ID\" = 1)", g.dameng.Update<Topic>(new Topic { Id = 1, Title = "test" }).SetRaw("title='test1'").AsTable(a => "tb_topicAsTable").ToSql());
+            Assert.Equal("UPDATE \"TB_TOPICASTABLE\" SET title='test1' \r\nWHERE (\"ID\" = 1 OR \"ID\" = 2)", g.dameng.Update<Topic>(new[] { new Topic { Id = 1, Title = "test" }, new Topic { Id = 2, Title = "test" } }).SetRaw("title='test1'").AsTable(a => "tb_topicAsTable").ToSql());
+            Assert.Equal("UPDATE \"TB_TOPICASTABLE\" SET title='test1' \r\nWHERE (\"ID\" = 1)", g.dameng.Update<Topic>(new { id = 1 }).SetRaw("title='test1'").AsTable(a => "tb_topicAsTable").ToSql());
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengAdo/DamengAdoTest.cs

@@ -0,0 +1,66 @@
+using FreeSql.DataAnnotations;
+using System;
+using Xunit;
+
+namespace FreeSql.Tests.Dameng
+{
+    public class DamengAdoTest
+    {
+        [Fact]
+        public void Pool()
+        {
+            var t1 = g.dameng.Ado.MasterPool.StatisticsFullily;
+        }
+
+        [Fact]
+        public void SlavePools()
+        {
+            var t2 = g.dameng.Ado.SlavePools.Count;
+        }
+
+        [Fact]
+        public void ExecuteReader()
+        {
+
+        }
+        [Fact]
+        public void ExecuteArray()
+        {
+
+        }
+        [Fact]
+        public void ExecuteNonQuery()
+        {
+
+        }
+        [Fact]
+        public void ExecuteScalar()
+        {
+
+        }
+
+        [Fact]
+        public void Query()
+        {
+
+            var t3 = g.dameng.Ado.Query<xxx>("select * from \"TB_TOPIC\"");
+
+            var t4 = g.dameng.Ado.Query<(int, string, string)>("select * from \"TB_TOPIC\"");
+
+            var t5 = g.dameng.Ado.Query<dynamic>("select * from \"TB_TOPIC\"");
+        }
+
+        [Fact]
+        public void QueryMultipline()
+        {
+            //var t3 = g.dameng.Ado.Query<xxx, (int, string, string), dynamic>("select * from \"TB_TOPIC\"; select * from \"TB_TOPIC\"; select * from \"TB_TOPIC\"");
+        }
+
+        class xxx
+        {
+            public int Id { get; set; }
+            public string Path { get; set; }
+            public string Title2 { get; set; }
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengAopTest.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+using Xunit;
+
+namespace FreeSql.Tests.Dameng
+{
+    public class DamengAopTest
+    {
+
+        class TestAuditValue
+        {
+            public Guid id { get; set; }
+            [Now]
+            public DateTime createtime { get; set; }
+        }
+        class NowAttribute: Attribute { }
+
+        [Fact]
+        public void AuditValue()
+        {
+            var date = DateTime.Now.Date;
+            var item = new TestAuditValue();
+
+            EventHandler<Aop.AuditValueEventArgs> audit = (s, e) =>
+             {
+                 if (e.Property.GetCustomAttribute<NowAttribute>(false) != null)
+                     e.Value = DateTime.Now.Date;
+             };
+            g.dameng.Aop.AuditValue += audit;
+
+            g.dameng.Insert(item).ExecuteAffrows();
+
+            g.dameng.Aop.AuditValue -= audit;
+
+            Assert.Equal(item.createtime, date);
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs

@@ -0,0 +1,352 @@
+using FreeSql.DataAnnotations;
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Xunit;
+
+namespace FreeSql.Tests.Dameng
+{
+    public class DamengCodeFirstTest
+    {
+        [Fact]
+        public void StringLength()
+        {
+            var dll = g.dameng.CodeFirst.GetComparisonDDLStatements<TS_SLTB>();
+            g.dameng.CodeFirst.SyncStructure<TS_SLTB>();
+        }
+        class TS_SLTB
+        {
+            public Guid Id { get; set; }
+            [Column(StringLength = 50)]
+            public string Title { get; set; }
+
+            [Column(IsNullable = false, StringLength = 50)]
+            public string TitleSub { get; set; }
+        }
+
+        [Fact]
+        public void 数字表_字段()
+        {
+            var sql = g.dameng.CodeFirst.GetComparisonDDLStatements<测试数字表>();
+            g.dameng.CodeFirst.SyncStructure<测试数字表>();
+
+            var item = new 测试数字表
+            {
+                标题 = "测试标题",
+                创建时间 = DateTime.Now
+            };
+            Assert.Equal(1, g.dameng.Insert<测试数字表>().AppendData(item).ExecuteAffrows());
+            Assert.NotEqual(Guid.Empty, item.编号);
+            var item2 = g.dameng.Select<测试数字表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+
+            item.标题 = "测试标题更新";
+            Assert.Equal(1, g.dameng.Update<测试数字表>().SetSource(item).ExecuteAffrows());
+            item2 = g.dameng.Select<测试数字表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+
+            item.标题 = "测试标题更新_repo";
+            var repo = g.dameng.GetRepository<测试数字表>();
+            Assert.Equal(1, repo.Update(item));
+            item2 = g.dameng.Select<测试数字表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+
+            item.标题 = "测试标题更新_repo22";
+            Assert.Equal(1, repo.Update(item));
+            item2 = g.dameng.Select<测试数字表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+        }
+        [Table(Name = "123测试数字表")]
+        class 测试数字表
+        {
+            [Column(IsPrimary = true, Name = "123编号")]
+            public Guid 编号 { get; set; }
+
+            [Column(Name = "123标题")]
+            public string 标题 { get; set; }
+
+            [Column(Name = "123创建时间")]
+            public DateTime 创建时间 { get; set; }
+        }
+
+        [Fact]
+        public void 中文表_字段()
+        {
+            var sql = g.dameng.CodeFirst.GetComparisonDDLStatements<测试中文表>();
+            g.dameng.CodeFirst.SyncStructure<测试中文表>();
+
+            var item = new 测试中文表
+            {
+                标题 = "测试标题",
+                创建时间 = DateTime.Now
+            };
+            Assert.Equal(1, g.dameng.Insert<测试中文表>().AppendData(item).ExecuteAffrows());
+            Assert.NotEqual(Guid.Empty, item.编号);
+            var item2 = g.dameng.Select<测试中文表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+
+            item.标题 = "测试标题更新";
+            Assert.Equal(1, g.dameng.Update<测试中文表>().SetSource(item).ExecuteAffrows());
+            item2 = g.dameng.Select<测试中文表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+
+            item.标题 = "测试标题更新_repo";
+            var repo = g.dameng.GetRepository<测试中文表>();
+            Assert.Equal(1, repo.Update(item));
+            item2 = g.dameng.Select<测试中文表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+
+            item.标题 = "测试标题更新_repo22";
+            Assert.Equal(1, repo.Update(item));
+            item2 = g.dameng.Select<测试中文表>().Where(a => a.编号 == item.编号).First();
+            Assert.NotNull(item2);
+            Assert.Equal(item.编号, item2.编号);
+            Assert.Equal(item.标题, item2.标题);
+        }
+        class 测试中文表
+        {
+            [Column(IsPrimary = true)]
+            public Guid 编号 { get; set; }
+
+            public string 标题 { get; set; }
+
+            public DateTime 创建时间 { get; set; }
+        }
+
+        [Fact]
+        public void AddUniques()
+        {
+            var sql = g.dameng.CodeFirst.GetComparisonDDLStatements<AddUniquesInfo>();
+            g.dameng.CodeFirst.SyncStructure<AddUniquesInfo>();
+        }
+        [Table(Name = "AddUniquesInfo", OldName = "AddUniquesInfo2")]
+        [Index("uk_phone", "phone", true)]
+        [Index("uk_group_index", "group,index", true)]
+        [Index("uk_group_index22", "group, index22", true)]
+        class AddUniquesInfo
+        {
+            public Guid id { get; set; }
+            public string phone { get; set; }
+
+            public string group { get; set; }
+            public int index { get; set; }
+            public string index22 { get; set; }
+        }
+        [Fact]
+        public void AddField()
+        {
+            var sql = g.dameng.CodeFirst.GetComparisonDDLStatements<TopicAddField>();
+
+            var id = g.dameng.Insert<TopicAddField>().AppendData(new TopicAddField { }).ExecuteIdentity();
+
+            //var inserted = g.dameng.Insert<TopicAddField>().AppendData(new TopicAddField { }).ExecuteInserted();
+        }
+
+        [Table(Name = "TopicAddField", OldName = "xxxtb.TopicAddField")]
+        public class TopicAddField
+        {
+            [Column(IsIdentity = true)]
+            public int Id { get; set; }
+
+            public string name { get; set; }
+
+            [Column(DbType = "varchar2(200) not null", OldName = "title")]
+            public string title2 { get; set; } = "10";
+
+            [Column(IsIgnore = true)]
+            public DateTime ct { get; set; } = DateTime.Now;
+        }
+
+        [Fact]
+        public void GetComparisonDDLStatements()
+        {
+
+            var sql = g.dameng.CodeFirst.GetComparisonDDLStatements<TableAllType>();
+            if (string.IsNullOrEmpty(sql) == false)
+            {
+                Assert.Equal(@"CREATE TABLE IF NOT EXISTS `cccddd`.`tb_alltype` ( 
+  `Id` INT(11) NOT NULL AUTO_INCREMENT, 
+  `Bool` BIT(1) NOT NULL, 
+  `SByte` TINYINT(3) NOT NULL, 
+  `Short` SMALLINT(6) NOT NULL, 
+  `Int` INT(11) NOT NULL, 
+  `Long` BIGINT(20) NOT NULL, 
+  `Byte` TINYINT(3) UNSIGNED NOT NULL, 
+  `UShort` SMALLINT(5) UNSIGNED NOT NULL, 
+  `UInt` INT(10) UNSIGNED NOT NULL, 
+  `ULong` BIGINT(20) UNSIGNED NOT NULL, 
+  `Double` DOUBLE NOT NULL, 
+  `Float` FLOAT NOT NULL, 
+  `Decimal` DECIMAL(10,2) NOT NULL, 
+  `TimeSpan` TIME NOT NULL, 
+  `DateTime` DATETIME NOT NULL, 
+  `Bytes` VARBINARY(255), 
+  `String` VARCHAR(255), 
+  `Guid` VARCHAR(36), 
+  `BoolNullable` BIT(1), 
+  `SByteNullable` TINYINT(3), 
+  `ShortNullable` SMALLINT(6), 
+  `IntNullable` INT(11), 
+  `testFielLongNullable` BIGINT(20), 
+  `ByteNullable` TINYINT(3) UNSIGNED, 
+  `UShortNullable` SMALLINT(5) UNSIGNED, 
+  `UIntNullable` INT(10) UNSIGNED, 
+  `ULongNullable` BIGINT(20) UNSIGNED, 
+  `DoubleNullable` DOUBLE, 
+  `FloatNullable` FLOAT, 
+  `DecimalNullable` DECIMAL(10,2), 
+  `TimeSpanNullable` TIME, 
+  `DateTimeNullable` DATETIME, 
+  `GuidNullable` VARCHAR(36), 
+  `Point` POINT, 
+  `LineString` LINESTRING, 
+  `Polygon` POLYGON, 
+  `MultiPoint` MULTIPOINT, 
+  `MultiLineString` MULTILINESTRING, 
+  `MultiPolygon` MULTIPOLYGON, 
+  `Enum1` ENUM('E1','E2','E3') NOT NULL, 
+  `Enum1Nullable` ENUM('E1','E2','E3'), 
+  `Enum2` SET('F1','F2','F3') NOT NULL, 
+  `Enum2Nullable` SET('F1','F2','F3'), 
+  PRIMARY KEY (`Id`)
+) Engine=InnoDB;
+", sql);
+            }
+
+            //sql = g.dameng.CodeFirst.GetComparisonDDLStatements<Tb_alltype>();
+        }
+
+        IInsert<TableAllType> insert => g.dameng.Insert<TableAllType>();
+        ISelect<TableAllType> select => g.dameng.Select<TableAllType>();
+
+        [Fact]
+        public void CurdAllField()
+        {
+            var item = new TableAllType { };
+            item.Id = (int)insert.AppendData(item).ExecuteIdentity();
+
+            var newitem = select.Where(a => a.Id == item.Id).ToOne();
+
+            var item2 = new TableAllType
+            {
+                Bool = true,
+                BoolNullable = true,
+                Byte = 255,
+                ByteNullable = 127,
+                Bytes = Encoding.UTF8.GetBytes("我是中国人"),
+                DateTime = DateTime.Now,
+                DateTimeNullable = DateTime.Now.AddHours(-1),
+                Decimal = 99.99M,
+                DecimalNullable = 99.98M,
+                Double = 999.99,
+                DoubleNullable = 999.98,
+                Enum1 = TableAllTypeEnumType1.e5,
+                Enum1Nullable = TableAllTypeEnumType1.e3,
+                Enum2 = TableAllTypeEnumType2.f2,
+                Enum2Nullable = TableAllTypeEnumType2.f3,
+                Float = 19.99F,
+                FloatNullable = 19.98F,
+                Guid = Guid.NewGuid(),
+                GuidNullable = Guid.NewGuid(),
+                Int = int.MaxValue,
+                IntNullable = int.MinValue,
+                SByte = 100,
+                SByteNullable = 99,
+                Short = short.MaxValue,
+                ShortNullable = short.MinValue,
+                String = "我是中国人string'\\?!@#$%^&*()_+{}}{~?><<>",
+                TimeSpan = TimeSpan.FromSeconds(999),
+                TimeSpanNullable = TimeSpan.FromSeconds(60),
+                UInt = uint.MaxValue,
+                UIntNullable = uint.MinValue,
+                ULong = ulong.MaxValue,
+                ULongNullable = ulong.MinValue,
+                UShort = ushort.MaxValue,
+                UShortNullable = ushort.MinValue,
+                testFielLongNullable = long.MinValue
+            };
+            var sqlPar = insert.AppendData(item2).ToSql();
+            var sqlText = insert.AppendData(item2).NoneParameter().ToSql();
+            var item3NP = insert.AppendData(item2).NoneParameter().ExecuteIdentity();
+
+            item2.Id = (int)insert.AppendData(item2).ExecuteIdentity();
+            var newitem2 = select.Where(a => a.Id == item2.Id).ToOne();
+            Assert.Equal(item2.String, newitem2.String);
+
+            item2.Id = (int)insert.NoneParameter().AppendData(item2).ExecuteIdentity();
+            newitem2 = select.Where(a => a.Id == item2.Id).ToOne();
+            Assert.Equal(item2.String, newitem2.String);
+
+            var items = select.ToList();
+        }
+
+        [Table(Name = "tb_alltype")]
+        class TableAllType
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+
+            public string id2 { get; set; } = "id2=10";
+
+            public bool Bool { get; set; }
+            public sbyte SByte { get; set; }
+            public short Short { get; set; }
+            public int Int { get; set; }
+            public long Long { get; set; }
+            public byte Byte { get; set; }
+            public ushort UShort { get; set; }
+            public uint UInt { get; set; }
+            public ulong ULong { get; set; }
+            public double Double { get; set; }
+            public float Float { get; set; }
+            public decimal Decimal { get; set; }
+            public TimeSpan TimeSpan { get; set; }
+            public DateTime DateTime { get; set; }
+            public DateTime DateTimeOffSet { get; set; }
+            public byte[] Bytes { get; set; }
+            public string String { get; set; }
+            public Guid Guid { get; set; }
+
+            public bool? BoolNullable { get; set; }
+            public sbyte? SByteNullable { get; set; }
+            public short? ShortNullable { get; set; }
+            public int? IntNullable { get; set; }
+            public long? testFielLongNullable { get; set; }
+            public byte? ByteNullable { get; set; }
+            public ushort? UShortNullable { get; set; }
+            public uint? UIntNullable { get; set; }
+            public ulong? ULongNullable { get; set; }
+            public double? DoubleNullable { get; set; }
+            public float? FloatNullable { get; set; }
+            public decimal? DecimalNullable { get; set; }
+            public TimeSpan? TimeSpanNullable { get; set; }
+            public DateTime? DateTimeNullable { get; set; }
+            public DateTime? DateTimeOffSetNullable { get; set; }
+            public Guid? GuidNullable { get; set; }
+
+            public TableAllTypeEnumType1 Enum1 { get; set; }
+            public TableAllTypeEnumType1? Enum1Nullable { get; set; }
+            public TableAllTypeEnumType2 Enum2 { get; set; }
+            public TableAllTypeEnumType2? Enum2Nullable { get; set; }
+        }
+
+        public enum TableAllTypeEnumType1 { e1, e2, e3, e5 }
+        [Flags] public enum TableAllTypeEnumType2 { f1, f2, f3 }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengDbFirstTest.cs

@@ -0,0 +1,25 @@
+using FreeSql.DataAnnotations;
+using System;
+using Xunit;
+
+namespace FreeSql.Tests.Dameng
+{
+    public class DamengDbFirstTest
+    {
+        [Fact]
+        public void GetDatabases()
+        {
+
+            var t1 = g.dameng.DbFirst.GetDatabases();
+
+        }
+
+        [Fact]
+        public void GetTablesByDatabase()
+        {
+
+            var t2 = g.dameng.DbFirst.GetTablesByDatabase();
+            //var tb = g.dameng.Ado.ExecuteArray(System.Data.CommandType.Text, "select * from \"tb_dbfirst\"");
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengExpression/ConvertTest.cs

@@ -0,0 +1,169 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.DamengExpression
+{
+    public class ConvertTest
+    {
+
+        ISelect<Topic> select => g.dameng.Select<Topic>();
+
+        [Table(Name = "tb_topic")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int Clicks { get; set; }
+            public int TypeGuid { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+        class TestTypeInfo
+        {
+            public int Guid { get; set; }
+            public int ParentId { get; set; }
+            public TestTypeParentInfo Parent { get; set; }
+            public string Name { get; set; }
+        }
+        class TestTypeParentInfo
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+
+            public List<TestTypeInfo> Types { get; set; }
+        }
+
+        [Fact]
+        public void ToBoolean()
+        {
+            var data = new List<object>();
+            //data.Add(select.Where(a => (Convert.ToBoolean(a.Clicks) ? 1 : 0) > 0).ToList());
+            //data.Add(select.Where(a => (bool.Parse(a.Clicks.ToString()) ? 1 : 0) > 0).ToList());
+        }
+        [Fact]
+        public void ToByte()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToByte(a.Clicks % 255) > 0).ToList());
+            data.Add(select.Where(a => byte.Parse((a.Clicks % 255).ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToChar()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToChar(a.Clicks) == '1').ToList());
+            data.Add(select.Where(a => char.Parse(a.Clicks.ToString()) == '1').ToList());
+        }
+        [Fact]
+        public void ToDateTime()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToDateTime(a.CreateTime.ToString()).Year > 0).ToList());
+            data.Add(select.Where(a => DateTime.Parse(a.CreateTime.ToString()).Year > 0).ToList());
+        }
+        [Fact]
+        public void ToDecimal()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToDecimal(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => decimal.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToDouble()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToDouble(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => double.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToInt16()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToInt16(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => short.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToInt32()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => (int)a.Clicks > 0).ToList());
+            data.Add(select.Where(a => Convert.ToInt32(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => int.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToInt64()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToInt64(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => long.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToSByte()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToSByte(a.Clicks % 128) > 0).ToList());
+            data.Add(select.Where(a => sbyte.Parse((a.Clicks % 128).ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToSingle()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToSingle(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => float.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void this_ToString()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToString(a.Clicks).Equals("")).ToList());
+            data.Add(select.Where(a => a.Clicks.ToString().Equals("")).ToList());
+        }
+        [Fact]
+        public void ToUInt16()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToUInt16(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => ushort.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToUInt32()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToUInt32(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => uint.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+        [Fact]
+        public void ToUInt64()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Convert.ToUInt64(a.Clicks) > 0).ToList());
+            data.Add(select.Where(a => ulong.Parse(a.Clicks.ToString()) > 0).ToList());
+        }
+
+        [Fact]
+        public void Guid_Parse()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Guid.Parse(Guid.Empty.ToString()) == Guid.Empty).ToList());
+        }
+
+        [Fact]
+        public void Guid_NewGuid()
+        {
+            var data = new List<object>();
+            //data.Add(select.OrderBy(a => Guid.NewGuid()).Limit(10).ToList());
+        }
+
+        [Fact]
+        public void Random()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => new Random().Next() > a.Clicks).Limit(10).ToList());
+            data.Add(select.Where(a => new Random().NextDouble() > a.Clicks).Limit(10).ToList());
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengExpression/DateTimeTest.cs

@@ -0,0 +1,706 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.DamengExpression
+{
+    public class DateTimeTest
+    {
+
+        ISelect<Topic> select => g.dameng.Select<Topic>();
+
+        [Table(Name = "tb_topic111333")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int Clicks { get; set; }
+            public int TypeGuid { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+        [Table(Name = "TestTypeInfo333")]
+        class TestTypeInfo
+        {
+            [Column(IsIdentity = true)]
+            public int Guid { get; set; }
+            public int ParentId { get; set; }
+            public TestTypeParentInfo Parent { get; set; }
+            public string Name { get; set; }
+            public DateTime Time { get; set; }
+        }
+        [Table(Name = "TestTypeParentInf1")]
+        class TestTypeParentInfo
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+
+            public List<TestTypeInfo> Types { get; set; }
+            public DateTime Time2 { get; set; }
+        }
+        [Fact]
+        public void Now()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Date == DateTime.Now.Date).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (cast(date_format(a.`CreateTime`, '%Y-%m-%d') as datetime) = cast(date_format(now(), '%Y-%m-%d') as datetime))
+        }
+        [Fact]
+        public void UtcNow()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Date == DateTime.UtcNow.Date).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (cast(date_format(a.`CreateTime`, '%Y-%m-%d') as datetime) = cast(date_format(utc_timestamp(), '%Y-%m-%d') as datetime))
+        }
+        [Fact]
+        public void MinValue()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Date == DateTime.MinValue.Date).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (cast(date_format(a.`CreateTime`, '%Y-%m-%d') as datetime) = cast(date_format(cast('0001/1/1 0:00:00' as datetime), '%Y-%m-%d') as datetime))
+        }
+        [Fact]
+        public void MaxValue()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Date == DateTime.MaxValue.Date).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (cast(date_format(a.`CreateTime`, '%Y-%m-%d') as datetime) = cast(date_format(cast('9999/12/31 23:59:59' as datetime), '%Y-%m-%d') as datetime))
+        }
+        [Fact]
+        public void Date()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Date == DateTime.Now.Date).ToList());
+            data.Add(select.Where(a => a.Type.Time.Date > DateTime.Now.Date).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Date > DateTime.Now.Date).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (cast(date_format(a.`CreateTime`, '%Y-%m-%d') as datetime) = cast(date_format(now(), '%Y-%m-%d') as datetime));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (cast(date_format(a__Type.`Time`, '%Y-%m-%d') as datetime) > cast(date_format(now(), '%Y-%m-%d') as datetime));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (cast(date_format(a__Type__Parent.`Time2`, '%Y-%m-%d') as datetime) > cast(date_format(now(), '%Y-%m-%d') as datetime));
+            data.Add(select.Where(a => DateTime.Now.Subtract(a.CreateTime.Date).TotalSeconds > 0).ToList());
+            data.Add(select.Where(a => DateTime.Now.Subtract(a.Type.Time.Date).TotalSeconds > 0).ToList());
+            data.Add(select.Where(a => DateTime.Now.Subtract(a.Type.Parent.Time2.Date).TotalSeconds > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (((timestampdiff(microsecond, cast(date_format(a.`CreateTime`, '%Y-%m-%d') as datetime), now())) / 1000000) > 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (((timestampdiff(microsecond, cast(date_format(a__Type.`Time`, '%Y-%m-%d') as datetime), now())) / 1000000) > 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (((timestampdiff(microsecond, cast(date_format(a__Type__Parent.`Time2`, '%Y-%m-%d') as datetime), now())) / 1000000) > 0)
+        }
+        [Fact]
+        public void TimeOfDay()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay == DateTime.Now.TimeOfDay).ToList());
+            data.Add(select.Where(a => a.Type.Time.TimeOfDay > DateTime.Now.TimeOfDay).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.TimeOfDay > DateTime.Now.TimeOfDay).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (timestampdiff(microsecond, date_format(now(), '1970-1-1 %H:%i:%s.%f'), now()) + 62135596800000000));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE ((timestampdiff(microsecond, date_format(a__Type.`Time`, '1970-1-1 %H:%i:%s.%f'), a__Type.`Time`) + 62135596800000000) > (timestampdiff(microsecond, date_format(now(), '1970-1-1 %H:%i:%s.%f'), now()) + 62135596800000000));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE ((timestampdiff(microsecond, date_format(a__Type__Parent.`Time2`, '1970-1-1 %H:%i:%s.%f'), a__Type__Parent.`Time2`) + 62135596800000000) > (timestampdiff(microsecond, date_format(now(), '1970-1-1 %H:%i:%s.%f'), now()) + 62135596800000000))
+        }
+        [Fact]
+        public void DayOfWeek()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.DayOfWeek > DateTime.Now.DayOfWeek).ToList());
+            data.Add(select.Where(a => a.Type.Time.DayOfWeek > DateTime.Now.DayOfWeek).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.DayOfWeek > DateTime.Now.DayOfWeek).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE ((dayofweek(a.`CreateTime`) - 1) > (dayofweek(now()) - 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE ((dayofweek(a__Type.`Time`) - 1) > (dayofweek(now()) - 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE ((dayofweek(a__Type__Parent.`Time2`) - 1) > (dayofweek(now()) - 1))
+        }
+        [Fact]
+        public void Day()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Day > DateTime.Now.Day).ToList());
+            data.Add(select.Where(a => a.Type.Time.Day > DateTime.Now.Day).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Day > DateTime.Now.Day).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (dayofmonth(a.`CreateTime`) > dayofmonth(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (dayofmonth(a__Type.`Time`) > dayofmonth(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (dayofmonth(a__Type__Parent.`Time2`) > dayofmonth(now()))
+        }
+        [Fact]
+        public void DayOfYear()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.DayOfYear > DateTime.Now.DayOfYear).ToList());
+            data.Add(select.Where(a => a.Type.Time.DayOfYear > DateTime.Now.DayOfYear).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.DayOfYear > DateTime.Now.DayOfYear).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (dayofyear(a.`CreateTime`) > dayofyear(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (dayofyear(a__Type.`Time`) > dayofyear(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (dayofyear(a__Type__Parent.`Time2`) > dayofyear(now()))
+        }
+        [Fact]
+        public void Month()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Month > DateTime.Now.Month).ToList());
+            data.Add(select.Where(a => a.Type.Time.Month > DateTime.Now.Month).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Month > DateTime.Now.Month).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (month(a.`CreateTime`) > month(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (month(a__Type.`Time`) > month(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (month(a__Type__Parent.`Time2`) > month(now()))
+        }
+        [Fact]
+        public void Year()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Year > DateTime.Now.Year).ToList());
+            data.Add(select.Where(a => a.Type.Time.Year > DateTime.Now.Year).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Year > DateTime.Now.Year).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (year(a.`CreateTime`) > year(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (year(a__Type.`Time`) > year(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (year(a__Type__Parent.`Time2`) > year(now()))
+        }
+        [Fact]
+        public void Hour()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Hour > DateTime.Now.Hour).ToList());
+            data.Add(select.Where(a => a.Type.Time.Hour > DateTime.Now.Hour).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Hour > DateTime.Now.Hour).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (hour(a.`CreateTime`) > hour(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (hour(a__Type.`Time`) > hour(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (hour(a__Type__Parent.`Time2`) > hour(now()))
+        }
+        [Fact]
+        public void Minute()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Minute > DateTime.Now.Minute).ToList());
+            data.Add(select.Where(a => a.Type.Time.Minute > DateTime.Now.Minute).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Minute > DateTime.Now.Minute).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (minute(a.`CreateTime`) > minute(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (minute(a__Type.`Time`) > minute(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (minute(a__Type__Parent.`Time2`) > minute(now()))
+        }
+        [Fact]
+        public void Second()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Second > DateTime.Now.Second).ToList());
+            data.Add(select.Where(a => a.Type.Time.Second > DateTime.Now.Second).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Second > DateTime.Now.Second).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (second(a.`CreateTime`) > second(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (second(a__Type.`Time`) > second(now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (second(a__Type__Parent.`Time2`) > second(now()))
+        }
+        [Fact]
+        public void Millisecond()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Millisecond > DateTime.Now.Millisecond).ToList());
+            data.Add(select.Where(a => a.Type.Time.Millisecond > DateTime.Now.Millisecond).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Millisecond > DateTime.Now.Millisecond).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (floor(microsecond(a.`CreateTime`) / 1000) > floor(microsecond(now()) / 1000));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (floor(microsecond(a__Type.`Time`) / 1000) > floor(microsecond(now()) / 1000));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (floor(microsecond(a__Type__Parent.`Time2`) / 1000) > floor(microsecond(now()) / 1000))
+        }
+        [Fact]
+        public void Ticks()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Ticks > DateTime.Now.Ticks).ToList());
+            data.Add(select.Where(a => a.Type.Time.Ticks > DateTime.Now.Ticks).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Ticks > DateTime.Now.Ticks).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE ((timestampdiff(microsecond, '1970-1-1', a.`CreateTime`) * 10 + 621355968000000000) > (timestampdiff(microsecond, '1970-1-1', now()) * 10 + 621355968000000000));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE ((timestampdiff(microsecond, '1970-1-1', a__Type.`Time`) * 10 + 621355968000000000) > (timestampdiff(microsecond, '1970-1-1', now()) * 10 + 621355968000000000));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE ((timestampdiff(microsecond, '1970-1-1', a__Type__Parent.`Time2`) * 10 + 621355968000000000) > (timestampdiff(microsecond, '1970-1-1', now()) * 10 + 621355968000000000))
+        }
+        [Fact]
+        public void Add()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Add(TimeSpan.FromDays(1)) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.Add(TimeSpan.FromDays(1)) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Add(TimeSpan.FromDays(1)) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval ((1 * 86400000000)) microsecond) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval ((1 * 86400000000)) microsecond) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval ((1 * 86400000000)) microsecond) > now())
+        }
+        [Fact]
+        public void AddDays()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddDays(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddDays(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddDays(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) day) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) day) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) day) > now())
+        }
+        [Fact]
+        public void AddHours()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddHours(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddHours(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddHours(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) hour) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) hour) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) hour) > now())
+        }
+        [Fact]
+        public void AddMilliseconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddMilliseconds(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddMilliseconds(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddMilliseconds(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) * 1000 microsecond) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) * 1000 microsecond) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) * 1000 microsecond) > now())
+        }
+        [Fact]
+        public void AddMinutes()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddMinutes(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddMinutes(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddMinutes(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) minute) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) minute) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) minute) > now())
+        }
+        [Fact]
+        public void AddMonths()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddMonths(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddMonths(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddMonths(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) month) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) month) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) month) > now())
+        }
+        [Fact]
+        public void AddSeconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddSeconds(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddSeconds(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddSeconds(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) second) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) second) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) second) > now())
+        }
+        [Fact]
+        public void AddTicks()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddTicks(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddTicks(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddTicks(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) / 10 microsecond) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) / 10 microsecond) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) / 10 microsecond) > now())
+        }
+        [Fact]
+        public void AddYears()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddYears(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddYears(1) > DateTime.Now).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddYears(1) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (date_add(a.`CreateTime`, interval (1) year) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (date_add(a__Type.`Time`, interval (1) year) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (date_add(a__Type__Parent.`Time2`, interval (1) year) > now())
+        }
+        [Fact]
+        public void Subtract()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.Subtract(DateTime.Now).TotalSeconds > 0).ToList());
+            data.Add(select.Where(a => a.Type.Time.Subtract(DateTime.Now).TotalSeconds > 0).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Subtract(DateTime.Now).TotalSeconds > 0).ToList());
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //WHERE ((extract(day from (systimestamp-a."CREATETIME"))*86400+extract(hour from (systimestamp-a."CREATETIME"))*3600+extract(minute from (systimestamp-a."CREATETIME"))*60+extract(second from (systimestamp-a."CREATETIME"))) > 0)
+
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //WHERE ((extract(day from (systimestamp-a__Type."TIME"))*86400+extract(hour from (systimestamp-a__Type."TIME"))*3600+extract(minute from (systimestamp-a__Type."TIME"))*60+extract(second from (systimestamp-a__Type."TIME"))) > 0)
+
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //LEFT JOIN "TESTTYPEPARENTINF1" a__Type__Parent ON a__Type__Parent."ID" = a__Type."PARENTID" 
+            //WHERE ((extract(day from (systimestamp-a__Type__Parent."TIME2"))*86400+extract(hour from (systimestamp-a__Type__Parent."TIME2"))*3600+extract(minute from (systimestamp-a__Type__Parent."TIME2"))*60+extract(second from (systimestamp-a__Type__Parent."TIME2"))) > 0)
+            data.Add(select.Where(a => a.CreateTime.Subtract(TimeSpan.FromDays(1)) > a.CreateTime).ToList());
+            data.Add(select.Where(a => a.Type.Time.Subtract(TimeSpan.FromDays(1)) > a.CreateTime).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.Subtract(TimeSpan.FromDays(1)) > a.CreateTime).ToList());
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //WHERE ((a."CREATETIME"-numtodsinterval((1)*86400,'second')) > a."CREATETIME")
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //WHERE ((a__Type."TIME"-numtodsinterval((1)*86400,'second')) > a."CREATETIME")
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //LEFT JOIN "TESTTYPEPARENTINF1" a__Type__Parent ON a__Type__Parent."ID" = a__Type."PARENTID" 
+            //WHERE ((a__Type__Parent."TIME2"-numtodsinterval((1)*86400,'second')) > a."CREATETIME")
+        }
+        [Fact]
+        public void Á½¸öÈÕÆÚÏà¼õ_Ч¹ûͬSubtract()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => (a.CreateTime - DateTime.Now).TotalSeconds > 0).ToList());
+            data.Add(select.Where(a => (a.Type.Time - DateTime.Now).TotalSeconds > 0).ToList());
+            data.Add(select.Where(a => (a.Type.Parent.Time2 - DateTime.Now).TotalSeconds > 0).ToList());
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //WHERE ((extract(day from (systimestamp-a."CREATETIME"))*86400+extract(hour from (systimestamp-a."CREATETIME"))*3600+extract(minute from (systimestamp-a."CREATETIME"))*60+extract(second from (systimestamp-a."CREATETIME"))) > 0)
+
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //WHERE ((extract(day from (systimestamp-a__Type."TIME"))*86400+extract(hour from (systimestamp-a__Type."TIME"))*3600+extract(minute from (systimestamp-a__Type."TIME"))*60+extract(second from (systimestamp-a__Type."TIME"))) > 0)
+
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //LEFT JOIN "TESTTYPEPARENTINF1" a__Type__Parent ON a__Type__Parent."ID" = a__Type."PARENTID" 
+            //WHERE ((extract(day from (systimestamp-a__Type__Parent."TIME2"))*86400+extract(hour from (systimestamp-a__Type__Parent."TIME2"))*3600+extract(minute from (systimestamp-a__Type__Parent."TIME2"))*60+extract(second from (systimestamp-a__Type__Parent."TIME2"))) > 0)
+            data.Add(select.Where(a => (a.CreateTime - TimeSpan.FromDays(1)) > a.CreateTime).ToList());
+            data.Add(select.Where(a => (a.Type.Time - TimeSpan.FromDays(1)) > a.CreateTime).ToList());
+            data.Add(select.Where(a => (a.Type.Parent.Time2 - TimeSpan.FromDays(1)) > a.CreateTime).ToList());
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a."TITLE", a."CREATETIME" 
+            //FROM "TB_TOPIC111333" a 
+            //WHERE ((a."CREATETIME"-numtodsinterval((1)*86400,'second')) > a."CREATETIME")
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //WHERE ((a__Type."TIME"-numtodsinterval((1)*86400,'second')) > a."CREATETIME")
+            //SELECT a."ID", a."CLICKS", a."TYPEGUID", a__Type."GUID", a__Type."PARENTID", a__Type."NAME", a__Type."TIME", a."TITLE", a."CREATETIME" 
+
+            //FROM "TB_TOPIC111333" a 
+            //LEFT JOIN "TESTTYPEINFO333" a__Type ON a__Type."GUID" = a."TYPEGUID" 
+            //LEFT JOIN "TESTTYPEPARENTINF1" a__Type__Parent ON a__Type__Parent."ID" = a__Type."PARENTID" 
+            //WHERE ((a__Type__Parent."TIME2"-numtodsinterval((1)*86400,'second')) > a."CREATETIME")
+        }
+        [Fact]
+        public void this_Equals()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.AddYears(1).Equals(DateTime.Now)).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddYears(1).Equals(DateTime.Now)).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddYears(1).Equals(DateTime.Now)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE ((date_add(a.`CreateTime`, interval (1) year) = now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE ((date_add(a__Type.`Time`, interval (1) year) = now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE ((date_add(a__Type__Parent.`Time2`, interval (1) year) = now()))
+        }
+        [Fact]
+        public void this_ToString()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.ToString().Equals(DateTime.Now)).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddYears(1).ToString().Equals(DateTime.Now)).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddYears(1).ToString().Equals(DateTime.Now)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE ((date_format(a.`CreateTime`, '%Y-%m-%d %H:%i:%s.%f') = now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE ((date_format(date_add(a__Type.`Time`, interval (1) year), '%Y-%m-%d %H:%i:%s.%f') = now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE ((date_format(date_add(a__Type__Parent.`Time2`, interval (1) year), '%Y-%m-%d %H:%i:%s.%f') = now()))
+        }
+
+        [Fact]
+        public void DateTime_Compare()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.CompareTo(DateTime.Now) == 0).ToList());
+            data.Add(select.Where(a => a.Type.Time.AddYears(1).CompareTo(DateTime.Now) == 0).ToList());
+            data.Add(select.Where(a => a.Type.Parent.Time2.AddYears(1).CompareTo(DateTime.Now) == 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (((a.`CreateTime`) - (now())) = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (((date_add(a__Type.`Time`, interval (1) year)) - (now())) = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (((date_add(a__Type__Parent.`Time2`, interval (1) year)) - (now())) = 0)
+        }
+        [Fact]
+        public void DateTime_DaysInMonth()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => DateTime.DaysInMonth(a.CreateTime.Year, a.CreateTime.Month) > 30).ToList());
+            data.Add(select.Where(a => DateTime.DaysInMonth(a.Type.Time.Year, a.Type.Time.Month) > 30).ToList());
+            data.Add(select.Where(a => DateTime.DaysInMonth(a.Type.Parent.Time2.Year, a.Type.Parent.Time2.Month) > 30).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (dayofmonth(last_day(concat(year(a.`CreateTime`), month(a.`CreateTime`), '-01'))) > 30);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (dayofmonth(last_day(concat(year(a__Type.`Time`), month(a__Type.`Time`), '-01'))) > 30);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (dayofmonth(last_day(concat(year(a__Type__Parent.`Time2`), month(a__Type__Parent.`Time2`), '-01'))) > 30)
+        }
+        [Fact]
+        public void DateTime_Equals()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => DateTime.Equals(a.CreateTime.AddYears(1), DateTime.Now)).ToList());
+            data.Add(select.Where(a => DateTime.Equals(a.Type.Time.AddYears(1), DateTime.Now)).ToList());
+            data.Add(select.Where(a => DateTime.Equals(a.Type.Parent.Time2.AddYears(1), DateTime.Now)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE ((date_add(a.`CreateTime`, interval (1) year) = now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE ((date_add(a__Type.`Time`, interval (1) year) = now()));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE ((date_add(a__Type__Parent.`Time2`, interval (1) year) = now()))
+        }
+        [Fact]
+        public void DateTime_IsLeapYear()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => DateTime.IsLeapYear(a.CreateTime.Year)).ToList());
+            data.Add(select.Where(a => DateTime.IsLeapYear(a.Type.Time.AddYears(1).Year)).ToList());
+            data.Add(select.Where(a => DateTime.IsLeapYear(a.Type.Parent.Time2.AddYears(1).Year)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (((year(a.`CreateTime`)) % 4 = 0 AND (year(a.`CreateTime`)) % 100 <> 0 OR (year(a.`CreateTime`)) % 400 = 0));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (((year(date_add(a__Type.`Time`, interval (1) year))) % 4 = 0 AND (year(date_add(a__Type.`Time`, interval (1) year))) % 100 <> 0 OR (year(date_add(a__Type.`Time`, interval (1) year))) % 400 = 0));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (((year(date_add(a__Type__Parent.`Time2`, interval (1) year))) % 4 = 0 AND (year(date_add(a__Type__Parent.`Time2`, interval (1) year))) % 100 <> 0 OR (year(date_add(a__Type__Parent.`Time2`, interval (1) year))) % 400 = 0))
+        }
+        [Fact]
+        public void DateTime_Parse()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => DateTime.Parse(a.CreateTime.ToString()) > DateTime.Now).ToList());
+            data.Add(select.Where(a => DateTime.Parse(a.Type.Time.AddYears(1).ToString()) > DateTime.Now).ToList());
+            data.Add(select.Where(a => DateTime.Parse(a.Type.Parent.Time2.AddYears(1).ToString()) > DateTime.Now).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic111333` a 
+            //WHERE (cast(date_format(a.`CreateTime`, '%Y-%m-%d %H:%i:%s.%f') as datetime) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type 
+            //WHERE (cast(date_format(date_add(a__Type.`Time`, interval (1) year), '%Y-%m-%d %H:%i:%s.%f') as datetime) > now());
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a__Type.`Time` as7, a.`Title` as8, a.`CreateTime` as9 
+            //FROM `tb_topic111333` a, `TestTypeInfo333` a__Type, `TestTypeParentInfo23123` a__Type__Parent 
+            //WHERE (cast(date_format(date_add(a__Type__Parent.`Time2`, interval (1) year), '%Y-%m-%d %H:%i:%s.%f') as datetime) > now())
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengExpression/MathTest.cs

@@ -0,0 +1,156 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.DamengExpression
+{
+    public class MathTest
+    {
+
+        ISelect<Topic> select => g.dameng.Select<Topic>();
+
+        [Table(Name = "tb_topic")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int Clicks { get; set; }
+            public int TypeGuid { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+        class TestTypeInfo
+        {
+            public int Guid { get; set; }
+            public int ParentId { get; set; }
+            public TestTypeParentInfo Parent { get; set; }
+            public string Name { get; set; }
+        }
+        class TestTypeParentInfo
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+
+            public List<TestTypeInfo> Types { get; set; }
+        }
+
+        [Fact]
+        public void PI()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.PI + a.Clicks > 0).ToList());
+        }
+        [Fact]
+        public void Abs()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Abs(-a.Clicks) > 0).ToList());
+        }
+        [Fact]
+        public void Sign()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Sign(-a.Clicks) > 0).ToList());
+        }
+        [Fact]
+        public void Floor()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Floor(a.Clicks + 0.5) == a.Clicks).ToList());
+        }
+        [Fact]
+        public void Ceiling()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Ceiling(a.Clicks + 0.5) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Round()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Round(a.Clicks + 0.5) == a.Clicks).ToList());
+            data.Add(select.Where(a => Math.Round(a.Clicks + 0.5, 1) > a.Clicks).ToList());
+        }
+        [Fact]
+        public void Exp()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Exp(1) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Log()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Log(a.Clicks + 0.5) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Log10()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Log10(a.Clicks + 0.5) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Pow()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Pow(2, a.Clicks % 5) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Sqrt()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Sqrt(Math.Pow(2, a.Clicks % 5)) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Cos()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Cos(Math.Pow(2, a.Clicks % 5)) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Sin()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Sin(Math.Pow(2, a.Clicks % 5)) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Tan()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Tan(Math.Pow(2, a.Clicks % 5)) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Acos()
+        {
+            var data = new List<object>();
+            //data.Add(select.Where(a => Math.Acos(Math.Pow(2, a.Clicks % 5)) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Asin()
+        {
+            var data = new List<object>();
+            //data.Add(select.Where(a => Math.Asin(Math.Pow(2, a.Clicks % 5)) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Atan()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Atan(Math.Pow(2, a.Clicks % 5)) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Atan2()
+        {
+            var data = new List<object>();
+            //data.Add(select.Where(a => Math.Atan2(2, a.Clicks) == a.Clicks + 1).ToList());
+        }
+        [Fact]
+        public void Truncate()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => Math.Truncate(a.Clicks * 1.0 / 3) == a.Clicks + 1).ToList());
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengExpression/OtherTest.cs

@@ -0,0 +1,165 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.DamengExpression
+{
+    public class OtherTest
+    {
+
+        ISelect<TableAllType> select => g.dameng.Select<TableAllType>();
+
+        public OtherTest()
+        {
+        }
+
+        [Fact]
+        public void Div()
+        {
+            var t1 = select.Where(a => a.Int / 3 > 3).Limit(10).ToList();
+            var t2 = select.Where(a => a.Long / 3 > 3).Limit(10).ToList();
+            var t3 = select.Where(a => a.Short / 3 > 3).Limit(10).ToList();
+
+            var t4 = select.Where(a => a.Int / 3.0 > 3).Limit(10).ToList();
+            var t5 = select.Where(a => a.Long / 3.0 > 3).Limit(10).ToList();
+            var t6 = select.Where(a => a.Short / 3.0 > 3).Limit(10).ToList();
+
+            var t7 = select.Where(a => a.Double / 3 > 3).Limit(10).ToList();
+            var t8 = select.Where(a => a.Decimal / 3 > 3).Limit(10).ToList();
+            var t9 = select.Where(a => a.Float / 3 > 3).Limit(10).ToList();
+        }
+
+        [Fact]
+        public void Boolean()
+        {
+            var t1 = select.Where(a => a.Bool == true).ToList();
+            var t2 = select.Where(a => a.Bool != true).ToList();
+            var t3 = select.Where(a => a.Bool == false).ToList();
+            var t4 = select.Where(a => !a.Bool).ToList();
+            var t5 = select.Where(a => a.Bool).ToList();
+            var t51 = select.WhereCascade(a => a.Bool).Limit(10).ToList();
+
+            var t11 = select.Where(a => a.BoolNullable == true).ToList();
+            var t22 = select.Where(a => a.BoolNullable != true).ToList();
+            var t33 = select.Where(a => a.BoolNullable == false).ToList();
+            var t44 = select.Where(a => !a.BoolNullable.Value).ToList();
+            var t55 = select.Where(a => a.BoolNullable.Value).ToList();
+
+            var t111 = select.Where(a => a.Bool == true && a.Id > 0).ToList();
+            var t222 = select.Where(a => a.Bool != true && a.Id > 0).ToList();
+            var t333 = select.Where(a => a.Bool == false && a.Id > 0).ToList();
+            var t444 = select.Where(a => !a.Bool && a.Id > 0).ToList();
+            var t555 = select.Where(a => a.Bool && a.Id > 0).ToList();
+
+            var t1111 = select.Where(a => a.BoolNullable == true && a.Id > 0).ToList();
+            var t2222 = select.Where(a => a.BoolNullable != true && a.Id > 0).ToList();
+            var t3333 = select.Where(a => a.BoolNullable == false && a.Id > 0).ToList();
+            var t4444 = select.Where(a => !a.BoolNullable.Value && a.Id > 0).ToList();
+            var t5555 = select.Where(a => a.BoolNullable.Value && a.Id > 0).ToList();
+
+            var t11111 = select.Where(a => a.Bool == true && a.Id > 0 && a.Bool == true).ToList();
+            var t22222 = select.Where(a => a.Bool != true && a.Id > 0 && a.Bool != true).ToList();
+            var t33333 = select.Where(a => a.Bool == false && a.Id > 0 && a.Bool == false).ToList();
+            var t44444 = select.Where(a => !a.Bool && a.Id > 0 && !a.Bool).ToList();
+            var t55555 = select.Where(a => a.Bool && a.Id > 0 && a.Bool).ToList();
+
+            var t111111 = select.Where(a => a.BoolNullable == true && a.Id > 0 && a.BoolNullable == true).ToList();
+            var t222222 = select.Where(a => a.BoolNullable != true && a.Id > 0 && a.BoolNullable != true).ToList();
+            var t333333 = select.Where(a => a.BoolNullable == false && a.Id > 0 && a.BoolNullable == false).ToList();
+            var t444444 = select.Where(a => !a.BoolNullable.Value && a.Id > 0 && !a.BoolNullable.Value).ToList();
+            var t555555 = select.Where(a => a.BoolNullable.Value && a.Id > 0 && a.BoolNullable.Value).ToList();
+        }
+
+        [Fact]
+        public void Array()
+        {
+            IEnumerable<int> testlinqlist = new List<int>(new[] { 1, 2, 3 });
+            var testlinq = select.Where(a => testlinqlist.Contains(a.Int)).ToList();
+
+            //in not in
+            var sql111 = select.Where(a => new[] { 1, 2, 3 }.Contains(a.Int)).ToList();
+            //var sql112 = select.Where(a => new[] { 1, 2, 3 }.Contains(a.Int) == false).ToList();
+            var sql113 = select.Where(a => !new[] { 1, 2, 3 }.Contains(a.Int)).ToList();
+
+            var inarray = new[] { 1, 2, 3 };
+            var sql1111 = select.Where(a => inarray.Contains(a.Int)).ToList();
+            //var sql1122 = select.Where(a => inarray.Contains(a.Int) == false).ToList();
+            var sql1133 = select.Where(a => !inarray.Contains(a.Int)).ToList();
+
+
+            //in not in
+            var sql11111 = select.Where(a => new List<int>() { 1, 2, 3 }.Contains(a.Int)).ToList();
+            //var sql11222 = select.Where(a => new List<int>() { 1, 2, 3 }.Contains(a.Int) == false).ToList();
+            var sql11333 = select.Where(a => !new List<int>() { 1, 2, 3 }.Contains(a.Int)).ToList();
+
+            var sql11111a = select.Where(a => new List<int>(new[] { 1, 2, 3 }).Contains(a.Int)).ToList();
+            //var sql11222b = select.Where(a => new List<int>(new[] { 1, 2, 3 }).Contains(a.Int) == false).ToList();
+            var sql11333c = select.Where(a => !new List<int>(new[] { 1, 2, 3 }).Contains(a.Int)).ToList();
+
+            var inarray2 = new List<int>() { 1, 2, 3 };
+            var sql111111 = select.Where(a => inarray.Contains(a.Int)).ToList();
+            //var sql112222 = select.Where(a => inarray.Contains(a.Int) == false).ToList();
+            var sql113333 = select.Where(a => !inarray.Contains(a.Int)).ToList();
+
+            var inarray2n = Enumerable.Range(1, 3333).ToArray();
+            var sql1111111 = select.Where(a => inarray2n.Contains(a.Int)).ToList();
+            var sql1122222 = select.Where(a => inarray2n.Contains(a.Int) == false).ToList();
+            var sql1133333 = select.Where(a => !inarray2n.Contains(a.Int)).ToList();
+        }
+
+        [Table(Name = "tb_alltype")]
+        class TableAllType
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+
+            public string id2 { get; set; } = "id2=10";
+
+            public bool Bool { get; set; }
+            public sbyte SByte { get; set; }
+            public short Short { get; set; }
+            public int Int { get; set; }
+            public long Long { get; set; }
+            public byte Byte { get; set; }
+            public ushort UShort { get; set; }
+            public uint UInt { get; set; }
+            public ulong ULong { get; set; }
+            public double Double { get; set; }
+            public float Float { get; set; }
+            public decimal Decimal { get; set; }
+            public TimeSpan TimeSpan { get; set; }
+            public DateTime DateTime { get; set; }
+            public DateTime DateTimeOffSet { get; set; }
+            public byte[] Bytes { get; set; }
+            public string String { get; set; }
+            public Guid Guid { get; set; }
+
+            public bool? BoolNullable { get; set; }
+            public sbyte? SByteNullable { get; set; }
+            public short? ShortNullable { get; set; }
+            public int? IntNullable { get; set; }
+            public long? testFielLongNullable { get; set; }
+            public byte? ByteNullable { get; set; }
+            public ushort? UShortNullable { get; set; }
+            public uint? UIntNullable { get; set; }
+            public ulong? ULongNullable { get; set; }
+            public double? DoubleNullable { get; set; }
+            public float? FloatNullable { get; set; }
+            public decimal? DecimalNullable { get; set; }
+            public TimeSpan? TimeSpanNullable { get; set; }
+            public DateTime? DateTimeNullable { get; set; }
+            public DateTime? DateTimeOffSetNullable { get; set; }
+            public Guid? GuidNullable { get; set; }
+
+            public TableAllTypeEnumType1 Enum1 { get; set; }
+            public TableAllTypeEnumType1? Enum1Nullable { get; set; }
+            public TableAllTypeEnumType2 Enum2 { get; set; }
+            public TableAllTypeEnumType2? Enum2Nullable { get; set; }
+        }
+
+        public enum TableAllTypeEnumType1 { e1, e2, e3, e5 }
+        [Flags] public enum TableAllTypeEnumType2 { f1, f2, f3 }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengExpression/StringTest.cs

@@ -0,0 +1,726 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.DamengExpression
+{
+    public class StringTest
+    {
+
+        ISelect<Topic> select => g.dameng.Select<Topic>();
+
+        [Table(Name = "tb_topic")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int Clicks { get; set; }
+            public int TypeGuid { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+        class TestTypeInfo
+        {
+            [Column(IsIdentity = true)]
+            public int Guid { get; set; }
+            public int ParentId { get; set; }
+            public TestTypeParentInfo Parent { get; set; }
+            public string Name { get; set; }
+        }
+        class TestTypeParentInfo
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+
+            public List<TestTypeInfo> Types { get; set; }
+        }
+        class TestEqualsGuid
+        {
+            public Guid id { get; set; }
+        }
+
+        [Fact]
+        public void Equals__()
+        {
+            var list = new List<object>();
+            list.Add(select.Where(a => a.Title.Equals("aaa")).ToList());
+            list.Add(g.dameng.Select<TestEqualsGuid>().Where(a => a.id.Equals(Guid.Empty)).ToList());
+        }
+
+
+        [Fact]
+        public void Empty()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => (a.Title ?? "") == string.Empty).ToSql());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (ifnull(a.`Title`, '') = '')
+        }
+
+        [Fact]
+        public void StartsWith()
+        {
+            var list = new List<object>();
+            list.Add(select.Where(a => a.Title.StartsWith("aaa")).ToList());
+            list.Add(select.Where(a => a.Title.StartsWith(a.Title)).ToList());
+            list.Add(select.Where(a => a.Title.StartsWith(a.Title + 1)).ToList());
+            list.Add(select.Where(a => a.Title.StartsWith(a.Type.Name)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE '%aaa')
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE concat('%', a.`Title`))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE concat('%', concat(a.`Title`, 1)))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE((a.`Title`) LIKE concat('%', a__Type.`Name`))
+            list.Add(select.Where(a => (a.Title + "aaa").StartsWith("aaa")).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").StartsWith(a.Title)).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").StartsWith(a.Title + 1)).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").StartsWith(a.Type.Name)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE '%aaa')
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat('%', a.`Title`))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat('%', concat(a.`Title`, 1)))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat('%', a__Type.`Name`))
+        }
+        [Fact]
+        public void EndsWith()
+        {
+            var list = new List<object>();
+            list.Add(select.Where(a => a.Title.EndsWith("aaa")).ToList());
+            list.Add(select.Where(a => a.Title.EndsWith(a.Title)).ToList());
+            list.Add(select.Where(a => a.Title.EndsWith(a.Title + 1)).ToList());
+            list.Add(select.Where(a => a.Title.EndsWith(a.Type.Name)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE 'aaa%')
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE concat(a.`Title`, '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE concat(concat(a.`Title`, 1), '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE((a.`Title`) LIKE concat(a__Type.`Name`, '%'))
+            list.Add(select.Where(a => (a.Title + "aaa").EndsWith("aaa")).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").EndsWith(a.Title)).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").EndsWith(a.Title + 1)).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").EndsWith(a.Type.Name)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE 'aaa%')
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat(a.`Title`, '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat(concat(a.`Title`, 1), '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat(a__Type.`Name`, '%'))
+        }
+        [Fact]
+        public void Contains()
+        {
+            var list = new List<object>();
+            list.Add(select.Where(a => a.Title.Contains("aaa")).ToList());
+            list.Add(select.Where(a => a.Title.Contains(a.Title)).ToList());
+            list.Add(select.Where(a => a.Title.Contains(a.Title + 1)).ToList());
+            list.Add(select.Where(a => a.Title.Contains(a.Type.Name)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE '%aaa%')
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE concat('%', a.`Title`, '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((a.`Title`) LIKE concat('%', a.`Title` +1, '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE((a.`Title`) LIKE concat('%', a__Type.`Name`, '%'))
+            list.Add(select.Where(a => (a.Title + "aaa").Contains("aaa")).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").Contains(a.Title)).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").Contains(a.Title + 1)).ToList());
+            list.Add(select.Where(a => (a.Title + "aaa").Contains(a.Type.Name)).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE '%aaa%')
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat('%', a.`Title`, '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat('%', concat(a.`Title`, 1), '%'))
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE((concat(a.`Title`, 'aaa')) LIKE concat('%', a__Type.`Name`, '%'))
+        }
+        [Fact]
+        public void ToLower()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.ToLower() == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.ToLower() == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.ToLower() == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.ToLower() == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE(lower(a.`Title`) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE(lower(a.`Title`) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE(lower(a.`Title`) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE(lower(a.`Title`) = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.ToLower() + "aaa").ToLower() == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.ToLower() + "aaa").ToLower() == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.ToLower() + "aaa").ToLower() == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.ToLower() + "aaa").ToLower() == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE(lower(concat(lower(a.`Title`), 'aaa')) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE(lower(concat(lower(a.`Title`), 'aaa')) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5
+            //FROM `tb_topic` a
+            //WHERE(lower(concat(lower(a.`Title`), 'aaa')) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type
+            //WHERE(lower(concat(lower(a.`Title`), 'aaa')) = a__Type.`Name`)
+        }
+        [Fact]
+        public void ToUpper()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.ToUpper() == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.ToUpper() == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.ToUpper() == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.ToUpper() == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (upper(a.`Title`) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (upper(a.`Title`) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (upper(a.`Title`) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (upper(a.`Title`) = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.ToUpper() + "aaa").ToUpper() == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.ToUpper() + "aaa").ToUpper() == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.ToUpper() + "aaa").ToUpper() == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.ToUpper() + "aaa").ToUpper() == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (upper(concat(upper(a.`Title`), 'aaa')) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (upper(concat(upper(a.`Title`), 'aaa')) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (upper(concat(upper(a.`Title`), 'aaa')) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (upper(concat(upper(a.`Title`), 'aaa')) = a__Type.`Name`)
+        }
+        [Fact]
+        public void Substring()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.Substring(0) == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.Substring(0) == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.Substring(0) == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.Substring(0) == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (substr(a.`Title`, 1) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (substr(a.`Title`, 1) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (substr(a.`Title`, 1) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (substr(a.`Title`, 1) = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.Substring(0) + "aaa").Substring(a.Title.Length) == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.Substring(0) + "aaa").Substring(0, a.Title.Length) == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.Substring(0) + "aaa").Substring(0, 3) == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.Substring(0) + "aaa").Substring(1, 2) == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (substr(concat(substr(a.`Title`, 1), 'aaa'), char_length(a.`Title`) + 1) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (substr(concat(substr(a.`Title`, 1), 'aaa'), 1, char_length(a.`Title`)) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (substr(concat(substr(a.`Title`, 1), 'aaa'), 1, 3) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (substr(concat(substr(a.`Title`, 1), 'aaa'), 2, 2) = a__Type.`Name`)
+        }
+        [Fact]
+        public void Length()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.Length == 0).ToList());
+            data.Add(select.Where(a => a.Title.Length == 1).ToList());
+            data.Add(select.Where(a => a.Title.Length == a.Title.Length + 1).ToList());
+            data.Add(select.Where(a => a.Title.Length == a.Type.Name.Length).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (char_length(a.`Title`) = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (char_length(a.`Title`) = 1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (char_length(a.`Title`) = char_length(a.`Title`) + 1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (char_length(a.`Title`) = char_length(a__Type.`Name`));
+            data.Add(select.Where(a => (a.Title + "aaa").Length == 0).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").Length == 1).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").Length == a.Title.Length + 1).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").Length == a.Type.Name.Length).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (char_length(concat(a.`Title`, 'aaa')) = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (char_length(concat(a.`Title`, 'aaa')) = 1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (char_length(concat(a.`Title`, 'aaa')) = char_length(a.`Title`) + 1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (char_length(concat(a.`Title`, 'aaa')) = char_length(a__Type.`Name`))
+        }
+        [Fact]
+        public void IndexOf()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.IndexOf("aaa") == -1).ToList());
+            data.Add(select.Where(a => a.Title.IndexOf("aaa", 2) == -1).ToList());
+            data.Add(select.Where(a => a.Title.IndexOf("aaa", 2) == (a.Title.Length + 1)).ToList());
+            data.Add(select.Where(a => a.Title.IndexOf("aaa", 2) == a.Type.Name.Length + 1).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((locate(a.`Title`, 'aaa') - 1) = -1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((locate(a.`Title`, 'aaa', 3) - 1) = -1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((locate(a.`Title`, 'aaa', 3) - 1) = char_length(a.`Title`) + 1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE ((locate(a.`Title`, 'aaa', 3) - 1) = char_length(a__Type.`Name`) + 1);
+            data.Add(select.Where(a => (a.Title + "aaa").IndexOf("aaa") == -1).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").IndexOf("aaa", 2) == -1).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").IndexOf("aaa", 2) == (a.Title.Length + 1)).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").IndexOf("aaa", 2) == a.Type.Name.Length + 1).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((locate(concat(a.`Title`, 'aaa'), 'aaa') - 1) = -1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((locate(concat(a.`Title`, 'aaa'), 'aaa', 3) - 1) = -1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((locate(concat(a.`Title`, 'aaa'), 'aaa', 3) - 1) = char_length(a.`Title`) + 1);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE ((locate(concat(a.`Title`, 'aaa'), 'aaa', 3) - 1) = char_length(a__Type.`Name`) + 1)
+        }
+        [Fact]
+        public void PadLeft()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.PadLeft(10, 'a') == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.PadLeft(10, 'a') == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.PadLeft(10, 'a') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.PadLeft(10, 'a') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (lpad(a.`Title`, 10, 'a') = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (lpad(a.`Title`, 10, 'a') = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (lpad(a.`Title`, 10, 'a') = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (lpad(a.`Title`, 10, 'a') = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.PadLeft(10, 'a') + "aaa").PadLeft(20, 'b') == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.PadLeft(10, 'a') + "aaa").PadLeft(20, 'b') == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.PadLeft(10, 'a') + "aaa").PadLeft(20, 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.PadLeft(10, 'a') + "aaa").PadLeft(20, 'b') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (lpad(concat(lpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (lpad(concat(lpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (lpad(concat(lpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (lpad(concat(lpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = a__Type.`Name`)
+        }
+        [Fact]
+        public void PadRight()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.PadRight(10, 'a') == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.PadRight(10, 'a') == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.PadRight(10, 'a') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.PadRight(10, 'a') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rpad(a.`Title`, 10, 'a') = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rpad(a.`Title`, 10, 'a') = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rpad(a.`Title`, 10, 'a') = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (rpad(a.`Title`, 10, 'a') = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.PadRight(10, 'a') + "aaa").PadRight(20, 'b') == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.PadRight(10, 'a') + "aaa").PadRight(20, 'b') == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.PadRight(10, 'a') + "aaa").PadRight(20, 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.PadRight(10, 'a') + "aaa").PadRight(20, 'b') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rpad(concat(rpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rpad(concat(rpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rpad(concat(rpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (rpad(concat(rpad(a.`Title`, 10, 'a'), 'aaa'), 20, 'b') = a__Type.`Name`)
+        }
+        [Fact]
+        public void Trim()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.Trim() == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.Trim('a') == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.Trim('a', 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.Trim('a', 'b', 'c') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(a.`Title`) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim('a' from a.`Title`) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim('b' from trim('a' from a.`Title`)) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (trim('c' from trim('b' from trim('a' from a.`Title`))) = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.Trim() + "aaa").Trim() == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.Trim('a') + "aaa").Trim('a') == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.Trim('a', 'b') + "aaa").Trim('a', 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.Trim('a', 'b', 'c') + "aaa").Trim('a', 'b', 'c') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(concat(trim(a.`Title`), 'aaa')) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim('a' from concat(trim('a' from a.`Title`), 'aaa')) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim('b' from trim('a' from concat(trim('b' from trim('a' from a.`Title`)), 'aaa'))) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (trim('c' from trim('b' from trim('a' from concat(trim('c' from trim('b' from trim('a' from a.`Title`))), 'aaa')))) = a__Type.`Name`)
+        }
+        [Fact]
+        public void TrimStart()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.TrimStart() == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.TrimStart('a') == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.TrimStart('a', 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.TrimStart('a', 'b', 'c') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (ltrim(a.`Title`) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'a' from trim(leading 'a' from a.`Title`)) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'b' from trim(leading 'b' from trim(trailing 'a' from trim(leading 'a' from a.`Title`)))) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (trim(trailing 'c' from trim(leading 'c' from trim(trailing 'b' from trim(leading 'b' from trim(trailing 'a' from trim(leading 'a' from a.`Title`)))))) = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.TrimStart() + "aaa").TrimStart() == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.TrimStart('a') + "aaa").TrimStart('a') == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.TrimStart('a', 'b') + "aaa").TrimStart('a', 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.TrimStart('a', 'b', 'c') + "aaa").TrimStart('a', 'b', 'c') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (ltrim(concat(ltrim(a.`Title`), 'aaa')) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'a' from trim(leading 'a' from concat(trim(trailing 'a' from trim(leading 'a' from a.`Title`)), 'aaa'))) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'b' from trim(leading 'b' from trim(trailing 'a' from trim(leading 'a' from concat(trim(trailing 'b' from trim(leading 'b' from trim(trailing 'a' from trim(leading 'a' from a.`Title`)))), 'aaa'))))) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (trim(trailing 'c' from trim(leading 'c' from trim(trailing 'b' from trim(leading 'b' from trim(trailing 'a' from trim(leading 'a' from concat(trim(trailing 'c' from trim(leading 'c' from trim(trailing 'b' from trim(leading 'b' from trim(trailing 'a' from trim(leading 'a' from a.`Title`)))))), 'aaa'))))))) = a__Type.`Name`)
+        }
+        [Fact]
+        public void TrimEnd()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.TrimEnd() == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.TrimEnd('a') == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.TrimEnd('a', 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.TrimEnd('a', 'b', 'c') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rtrim(a.`Title`) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'a' from a.`Title`) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'b' from trim(trailing 'a' from a.`Title`)) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (trim(trailing 'c' from trim(trailing 'b' from trim(trailing 'a' from a.`Title`))) = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.TrimEnd() + "aaa").TrimEnd() == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.TrimEnd('a') + "aaa").TrimEnd('a') == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.TrimEnd('a', 'b') + "aaa").TrimEnd('a', 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.TrimEnd('a', 'b', 'c') + "aaa").TrimEnd('a', 'b', 'c') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (rtrim(concat(rtrim(a.`Title`), 'aaa')) = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'a' from concat(trim(trailing 'a' from a.`Title`), 'aaa')) = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (trim(trailing 'b' from trim(trailing 'a' from concat(trim(trailing 'b' from trim(trailing 'a' from a.`Title`)), 'aaa'))) = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (trim(trailing 'c' from trim(trailing 'b' from trim(trailing 'a' from concat(trim(trailing 'c' from trim(trailing 'b' from trim(trailing 'a' from a.`Title`))), 'aaa')))) = a__Type.`Name`)
+        }
+        [Fact]
+        public void Replace()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.Replace("a", "b") == "aaa").ToList());
+            data.Add(select.Where(a => a.Title.Replace("a", "b").Replace("b", "c") == a.Title).ToList());
+            data.Add(select.Where(a => a.Title.Replace("a", "b").Replace("b", "c").Replace("c", "a") == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => a.Title.Replace("a", "b").Replace("b", "c").Replace(a.Type.Name, "a") == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (replace(a.`Title`, 'a', 'b') = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (replace(replace(a.`Title`, 'a', 'b'), 'b', 'c') = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (replace(replace(replace(a.`Title`, 'a', 'b'), 'b', 'c'), 'c', 'a') = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (replace(replace(replace(a.`Title`, 'a', 'b'), 'b', 'c'), a__Type.`Name`, 'a') = a__Type.`Name`);
+            data.Add(select.Where(a => (a.Title.Replace("a", "b") + "aaa").TrimEnd() == "aaa").ToList());
+            data.Add(select.Where(a => (a.Title.Replace("a", "b").Replace("b", "c") + "aaa").TrimEnd('a') == a.Title).ToList());
+            data.Add(select.Where(a => (a.Title.Replace("a", "b").Replace("b", "c").Replace("c", "a") + "aaa").TrimEnd('a', 'b') == (a.Title + 1)).ToList());
+            data.Add(select.Where(a => (a.Title.Replace("a", "b").Replace("b", "c").Replace(a.Type.Name, "a") + "aaa").TrimEnd('a', 'b', 'c') == a.Type.Name).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (concat(replace(a.`Title`, 'a', 'b'), 'aaa') = 'aaa');
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (concat(replace(replace(a.`Title`, 'a', 'b'), 'b', 'c'), 'aaa') = a.`Title`);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (concat(replace(replace(replace(a.`Title`, 'a', 'b'), 'b', 'c'), 'c', 'a'), 'aaa') = concat(a.`Title`, 1));
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (concat(replace(replace(replace(a.`Title`, 'a', 'b'), 'b', 'c'), a__Type.`Name`, 'a'), 'aaa') = a__Type.`Name`)
+        }
+        [Fact]
+        public void CompareTo()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.Title.CompareTo(a.Title) == 0).ToList());
+            data.Add(select.Where(a => a.Title.CompareTo(a.Title) > 0).ToList());
+            data.Add(select.Where(a => a.Title.CompareTo(a.Title + 1) == 0).ToList());
+            data.Add(select.Where(a => a.Title.CompareTo(a.Title + a.Type.Name) == 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (strcmp(a.`Title`, a.`Title`) = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (strcmp(a.`Title`, a.`Title`) > 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (strcmp(a.`Title`, concat(a.`Title`, 1)) = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (strcmp(a.`Title`, concat(a.`Title`, a__Type.`Name`)) = 0);
+            data.Add(select.Where(a => (a.Title + "aaa").CompareTo("aaa") == 0).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").CompareTo(a.Title) > 0).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").CompareTo(a.Title + 1) == 0).ToList());
+            data.Add(select.Where(a => (a.Title + "aaa").CompareTo(a.Type.Name) == 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (strcmp(concat(a.`Title`, 'aaa'), 'aaa') = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (strcmp(concat(a.`Title`, 'aaa'), a.`Title`) > 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (strcmp(concat(a.`Title`, 'aaa'), concat(a.`Title`, 1)) = 0);
+
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 
+            //FROM `tb_topic` a, `TestTypeInfo` a__Type 
+            //WHERE (strcmp(concat(a.`Title`, 'aaa'), a__Type.`Name`) = 0)
+        }
+
+        [Fact]
+        public void string_IsNullOrEmpty()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => string.IsNullOrEmpty(a.Title)).ToList());
+            data.Add(select.Where(a => !string.IsNullOrEmpty(a.Title)).ToList());
+        }
+
+        [Fact]
+        public void string_IsNullOrWhiteSpace()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => string.IsNullOrWhiteSpace(a.Title)).ToList());
+            data.Add(select.Where(a => !string.IsNullOrWhiteSpace(a.Title)).ToList());
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/DamengExpression/TimeSpanTest.cs

@@ -0,0 +1,293 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.DamengExpression
+{
+    public class TimeSpanTest
+    {
+
+        ISelect<Topic> select => g.dameng.Select<Topic>();
+
+        [Table(Name = "tb_topic")]
+        class Topic
+        {
+            [Column(IsIdentity = true, IsPrimary = true)]
+            public int Id { get; set; }
+            public int Clicks { get; set; }
+            public int TypeGuid { get; set; }
+            public TestTypeInfo Type { get; set; }
+            public string Title { get; set; }
+            public DateTime CreateTime { get; set; }
+        }
+        class TestTypeInfo
+        {
+            public int Guid { get; set; }
+            public int ParentId { get; set; }
+            public TestTypeParentInfo Parent { get; set; }
+            public string Name { get; set; }
+        }
+        class TestTypeParentInfo
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+
+            public List<TestTypeInfo> Types { get; set; }
+        }
+        [Fact]
+        public void Zero()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay > TimeSpan.Zero).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) > 0)
+        }
+        [Fact]
+        public void MinValue()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay > TimeSpan.MinValue).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) > -922337203685477580)
+        }
+        [Fact]
+        public void MaxValue()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay < TimeSpan.MaxValue).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) < 922337203685477580)
+        }
+        [Fact]
+        public void Days()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Days == 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) div 86400000000) = 0)
+        }
+        [Fact]
+        public void Hours()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Hours > 0).ToSql());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) div 3600000000) mod 24 > 0)
+        }
+        [Fact]
+        public void Milliseconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Milliseconds > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) div 1000 mod 1000) > 0)
+        }
+        [Fact]
+        public void Minutes()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Minutes > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) div 60000000 mod 60) > 0)
+        }
+        [Fact]
+        public void Seconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Seconds > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) div 1000000 mod 60) > 0)
+        }
+        [Fact]
+        public void Ticks()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Ticks > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) * 10) > 0)
+        }
+        [Fact]
+        public void TotalDays()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.TotalDays > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) / 86400000000) > 0)
+        }
+        [Fact]
+        public void TotalHours()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.TotalHours > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) / 3600000000) > 0)
+        }
+        [Fact]
+        public void TotalMilliseconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.TotalMilliseconds > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) / 1000) > 0)
+        }
+        [Fact]
+        public void TotalMinutes()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.TotalMinutes > 0).ToSql());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) / 60000000) > 0)
+        }
+        [Fact]
+        public void TotalSeconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.TotalSeconds > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) / 1000000) > 0)
+        }
+        [Fact]
+        public void Add()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Add(TimeSpan.FromDays(1)) > TimeSpan.Zero).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) + (1 * 86400000000)) > 0)
+        }
+        [Fact]
+        public void Subtract()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Subtract(TimeSpan.FromDays(1)) > TimeSpan.Zero).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) - (1 * 86400000000)) > 0)
+        }
+        [Fact]
+        public void CompareTo()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.CompareTo(TimeSpan.FromDays(1)) > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) - ((1 * 86400000000))) > 0)
+        }
+        [Fact]
+        public void this_Equals()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.Equals(TimeSpan.FromDays(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 * 86400000000)))
+        }
+        [Fact]
+        public void this_ToString()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => a.CreateTime.TimeOfDay.ToString() == "ssss").ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (date_format(date_add(cast('0001/1/1 0:00:00' as datetime), interval (timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) microsecond), '%Y-%m-%d %H:%i:%s.%f') = 'ssss')
+        }
+
+        [Fact]
+        public void TimeSpan_Compare()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Compare(a.CreateTime.TimeOfDay, TimeSpan.FromDays(1)) > 0).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) - ((1 * 86400000000))) > 0)
+        }
+        [Fact]
+        public void TimeSpan_Equals()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Equals(a.CreateTime.TimeOfDay, TimeSpan.FromDays(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 * 86400000000)))
+        }
+        [Fact]
+        public void TimeSpan_FromDays()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Equals(a.CreateTime.TimeOfDay, TimeSpan.FromDays(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 * 86400000000)))
+        }
+        [Fact]
+        public void TimeSpan_FromHours()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Equals(a.CreateTime.TimeOfDay, TimeSpan.FromHours(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 * 3600000000)))
+        }
+        [Fact]
+        public void TimeSpan_FromMilliseconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Equals(a.CreateTime.TimeOfDay, TimeSpan.FromMilliseconds(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 * 1000)))
+        }
+        [Fact]
+        public void TimeSpan_FromMinutes()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Equals(a.CreateTime.TimeOfDay, TimeSpan.FromMinutes(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 * 60000000)))
+        }
+        [Fact]
+        public void TimeSpan_FromSeconds()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Equals(a.CreateTime.TimeOfDay, TimeSpan.FromSeconds(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 * 1000000)))
+        }
+        [Fact]
+        public void TimeSpan_FromTicks()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Equals(a.CreateTime.TimeOfDay, TimeSpan.FromTicks(1))).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE ((timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000) = (1 / 10)))
+        }
+        [Fact]
+        public void TimeSpan_Parse()
+        {
+            var data = new List<object>();
+            data.Add(select.Where(a => TimeSpan.Parse(a.CreateTime.TimeOfDay.ToString()) > TimeSpan.Zero).ToList());
+            //SELECT a.`Id` as1, a.`Clicks` as2, a.`TypeGuid` as3, a.`Title` as4, a.`CreateTime` as5 
+            //FROM `tb_topic` a 
+            //WHERE (cast(date_format(date_add(cast('0001/1/1 0:00:00' as datetime), interval (timestampdiff(microsecond, date_format(a.`CreateTime`, '1970-1-1 %H:%i:%s.%f'), a.`CreateTime`) + 62135596800000000)) microsecond), '%Y-%m-%d %H:%i:%s.%f') as signed) > 0)
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/MapType/DateTimeOffSetTest.cs

@@ -0,0 +1,54 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Numerics;
+using Xunit;
+
+namespace FreeSql.Tests.DamengMapType
+{
+    public class DateTimeOffSetTest
+    {
+        class Dtos_dt
+        {
+            public Guid id { get; set; }
+
+            [Column(MapType = typeof(DateTime))]
+            public DateTimeOffset dtos_to_dt { get; set; }
+            [Column(MapType = typeof(DateTime))]
+            public DateTimeOffset? dtofnil_to_dt { get; set; }
+        }
+        [Fact]
+        public void DateTimeToDateTimeOffSet()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new Dtos_dt { dtos_to_dt = DateTimeOffset.Now, dtofnil_to_dt = DateTimeOffset.Now };
+            Assert.Equal(1, orm.Insert<Dtos_dt>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<Dtos_dt>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.dtos_to_dt.ToString("g"), find.dtos_to_dt.ToString("g"));
+            Assert.Equal(item.dtofnil_to_dt.Value.ToString("g"), find.dtofnil_to_dt.Value.ToString("g"));
+
+            //update all
+            item.dtos_to_dt = DateTimeOffset.Now;
+            Assert.Equal(1, orm.Update<Dtos_dt>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<Dtos_dt>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.dtos_to_dt.ToString("g"), find.dtos_to_dt.ToString("g"));
+            Assert.Equal(item.dtofnil_to_dt.Value.ToString("g"), find.dtofnil_to_dt.Value.ToString("g"));
+
+            //update set
+            Assert.Equal(1, orm.Update<Dtos_dt>().Where(a => a.id == item.id).Set(a => a.dtos_to_dt, item.dtos_to_dt = DateTimeOffset.Now).ExecuteAffrows());
+            find = orm.Select<Dtos_dt>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.dtos_to_dt.ToString("g"), find.dtos_to_dt.ToString("g"));
+            Assert.Equal(item.dtofnil_to_dt.Value.ToString("g"), find.dtofnil_to_dt.Value.ToString("g"));
+
+            //delete
+            Assert.Equal(1, orm.Delete<Dtos_dt>().Where(a => a.id == item.id).ExecuteAffrows());
+            Assert.Null(orm.Select<Dtos_dt>().Where(a => a.id == item.id).First());
+        }
+        
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/MapType/EnumTest.cs

@@ -0,0 +1,261 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Numerics;
+using Xunit;
+
+namespace FreeSql.Tests.DamengMapType
+{
+    public class EnumTest
+    {
+        class EnumTestMap
+        {
+            public Guid id { get; set; }
+
+            [Column(MapType = typeof(string))]
+            public ToStringMapEnum enum_to_string { get; set; }
+            [Column(MapType = typeof(string))]
+            public ToStringMapEnum? enumnullable_to_string { get; set; }
+
+            [Column(MapType = typeof(int))]
+            public ToStringMapEnum enum_to_int { get; set; }
+            [Column(MapType = typeof(int?))]
+            public ToStringMapEnum? enumnullable_to_int { get; set; }
+        }
+        public enum ToStringMapEnum { 中国人, abc, 香港 }
+        [Fact]
+        public void EnumToString()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new EnumTestMap { };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.中国人, find.enum_to_string);
+
+            item = new EnumTestMap { enum_to_string = ToStringMapEnum.abc };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.abc, find.enum_to_string);
+
+            //update all
+            item.enum_to_string = ToStringMapEnum.香港;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.香港, find.enum_to_string);
+
+            item.enum_to_string = ToStringMapEnum.中国人;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.中国人, find.enum_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enum_to_string, ToStringMapEnum.香港).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.香港, find.enum_to_string);
+
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enum_to_string, ToStringMapEnum.abc).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.abc, find.enum_to_string);
+
+            //delete
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.中国人).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.香港).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.abc).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void EnumNullableToString()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new EnumTestMap { };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Null(find.enumnullable_to_string);
+
+            item = new EnumTestMap { enumnullable_to_string = ToStringMapEnum.中国人 };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Equal(ToStringMapEnum.中国人, find.enumnullable_to_string);
+
+            //update all
+            item.enumnullable_to_string = ToStringMapEnum.香港;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Equal(ToStringMapEnum.香港, find.enumnullable_to_string);
+
+            item.enumnullable_to_string = null;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.香港).First());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Null(find.enumnullable_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enumnullable_to_string, ToStringMapEnum.abc).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.abc, find.enumnullable_to_string);
+
+
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enumnullable_to_string, null).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.abc).First());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Null(find.enumnullable_to_string);
+
+            //delete
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.中国人).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.香港).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id).First());
+        }
+
+        [Fact]
+        public void EnumToInt()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new EnumTestMap { };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_int, find.enum_to_int);
+            Assert.Equal(ToStringMapEnum.中国人, find.enum_to_int);
+
+            item = new EnumTestMap { enum_to_int = ToStringMapEnum.abc };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_int, find.enum_to_int);
+            Assert.Equal(ToStringMapEnum.abc, find.enum_to_int);
+
+            //update all
+            item.enum_to_int = ToStringMapEnum.香港;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_int, find.enum_to_int);
+            Assert.Equal(ToStringMapEnum.香港, find.enum_to_int);
+
+            item.enum_to_int = ToStringMapEnum.中国人;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_int, find.enum_to_int);
+            Assert.Equal(ToStringMapEnum.中国人, find.enum_to_int);
+
+            //update set
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enum_to_int, ToStringMapEnum.香港).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.香港, find.enum_to_int);
+
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enum_to_int, ToStringMapEnum.abc).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.abc, find.enum_to_int);
+
+            //delete
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.中国人).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.香港).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enum_to_int == ToStringMapEnum.abc).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void EnumNullableToInt()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new EnumTestMap { };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_int, find.enumnullable_to_int);
+            Assert.Null(find.enumnullable_to_int);
+
+            item = new EnumTestMap { enumnullable_to_int = ToStringMapEnum.中国人 };
+            Assert.Equal(1, orm.Insert<EnumTestMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_int, find.enumnullable_to_int);
+            Assert.Equal(ToStringMapEnum.中国人, find.enumnullable_to_int);
+
+            //update all
+            item.enumnullable_to_int = ToStringMapEnum.香港;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_int, find.enumnullable_to_int);
+            Assert.Equal(ToStringMapEnum.香港, find.enumnullable_to_int);
+
+            item.enumnullable_to_int = null;
+            Assert.Equal(1, orm.Update<EnumTestMap>().SetSource(item).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == ToStringMapEnum.香港).First());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_int, find.enumnullable_to_int);
+            Assert.Null(find.enumnullable_to_int);
+
+            //update set
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enumnullable_to_int, ToStringMapEnum.abc).ExecuteAffrows());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.abc, find.enumnullable_to_int);
+
+
+            Assert.Equal(1, orm.Update<EnumTestMap>().Where(a => a.id == item.id).Set(a => a.enumnullable_to_int, null).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == ToStringMapEnum.abc).First());
+            find = orm.Select<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Null(find.enumnullable_to_int);
+
+            //delete
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == ToStringMapEnum.中国人).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == ToStringMapEnum.香港).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<EnumTestMap>().Where(a => a.id == item.id && a.enumnullable_to_int == null).ExecuteAffrows());
+            Assert.Null(orm.Select<EnumTestMap>().Where(a => a.id == item.id).First());
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/Dameng/MapType/ToStringTest.cs

@@ -0,0 +1,570 @@
+using FreeSql.DataAnnotations;
+using System;
+using System.Numerics;
+using Xunit;
+
+namespace FreeSql.Tests.DamengMapType
+{
+    public class ToStringTest
+    {
+        class ToStringMap
+        {
+            public Guid id { get; set; }
+
+            [Column(MapType = typeof(string))]
+            public TimeSpan timespan_to_string { get; set; }
+            [Column(MapType = typeof(string))]
+            public TimeSpan? timespannullable_to_string { get; set; }
+
+            [Column(MapType = typeof(string))]
+            public DateTime datetime_to_string { get; set; }
+            [Column(MapType = typeof(string))]
+            public DateTime? datetimenullable_to_string { get; set; }
+
+            [Column(MapType = typeof(string))]
+            public Guid guid_to_string { get; set; }
+            [Column(MapType = typeof(string))]
+            public Guid? guidnullable_to_string { get; set; }
+
+            [Column(MapType = typeof(string))]
+            public ToStringMapEnum enum_to_string { get; set; }
+            [Column(MapType = typeof(string))]
+            public ToStringMapEnum? enumnullable_to_string { get; set; }
+
+            [Column(MapType = typeof(string))]
+            public BigInteger biginteger_to_string { get; set; }
+            [Column(MapType = typeof(string))]
+            public BigInteger? bigintegernullable_to_string { get; set; }
+        }
+        public enum ToStringMapEnum { 中国人, abc, 香港 }
+        [Fact]
+        public void Enum1()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.中国人, find.enum_to_string);
+
+            item = new ToStringMap { enum_to_string = ToStringMapEnum.abc };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.abc, find.enum_to_string);
+
+            //update all
+            item.enum_to_string = ToStringMapEnum.香港;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.香港, find.enum_to_string);
+
+            item.enum_to_string = ToStringMapEnum.中国人;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enum_to_string, find.enum_to_string);
+            Assert.Equal(ToStringMapEnum.中国人, find.enum_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.enum_to_string, ToStringMapEnum.香港).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.香港, find.enum_to_string);
+
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.enum_to_string, ToStringMapEnum.abc).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.abc, find.enum_to_string);
+
+            //delete
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.中国人).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.香港).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.enum_to_string == ToStringMapEnum.abc).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void EnumNullable()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Null(find.enumnullable_to_string);
+
+            item = new ToStringMap { enumnullable_to_string = ToStringMapEnum.中国人 };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.中国人).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Equal(ToStringMapEnum.中国人, find.enumnullable_to_string);
+
+            //update all
+            item.enumnullable_to_string = ToStringMapEnum.香港;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.香港).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Equal(ToStringMapEnum.香港, find.enumnullable_to_string);
+
+            item.enumnullable_to_string = null;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.香港).First());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.enumnullable_to_string, find.enumnullable_to_string);
+            Assert.Null(find.enumnullable_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.enumnullable_to_string, ToStringMapEnum.abc).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.abc).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(ToStringMapEnum.abc, find.enumnullable_to_string);
+
+
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.enumnullable_to_string, null).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.abc).First());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Null(find.enumnullable_to_string);
+
+            //delete
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.中国人).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == ToStringMapEnum.香港).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.enumnullable_to_string == null).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void BigInteger1()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 0).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.biginteger_to_string, find.biginteger_to_string);
+            Assert.Equal(0, find.biginteger_to_string);
+
+            item = new ToStringMap { biginteger_to_string = 100 };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 100).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.biginteger_to_string, find.biginteger_to_string);
+            Assert.Equal(100, find.biginteger_to_string);
+
+            //update all
+            item.biginteger_to_string = 200;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 200).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.biginteger_to_string, find.biginteger_to_string);
+            Assert.Equal(200, find.biginteger_to_string);
+
+            item.biginteger_to_string = 205;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 205).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.biginteger_to_string, find.biginteger_to_string);
+            Assert.Equal(205, find.biginteger_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.biginteger_to_string, 522).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 522).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(522, find.biginteger_to_string);
+
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.biginteger_to_string, 10005).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 10005).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(10005, find.biginteger_to_string);
+
+            //delete
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 522).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 205).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.biginteger_to_string == 10005).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void BigIntegerNullable()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.bigintegernullable_to_string, find.bigintegernullable_to_string);
+            Assert.Null(find.bigintegernullable_to_string);
+
+            item = new ToStringMap { bigintegernullable_to_string = 101 };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == 101).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.bigintegernullable_to_string, find.bigintegernullable_to_string);
+            Assert.Equal(101, find.bigintegernullable_to_string);
+
+            //update all
+            item.bigintegernullable_to_string = 2004;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == 2004).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.bigintegernullable_to_string, find.bigintegernullable_to_string);
+            Assert.Equal(2004, find.bigintegernullable_to_string);
+
+            item.bigintegernullable_to_string = null;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == 2004).First());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.bigintegernullable_to_string, find.bigintegernullable_to_string);
+            Assert.Null(find.bigintegernullable_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.bigintegernullable_to_string, 998).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == 998).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(998, find.bigintegernullable_to_string);
+
+
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.bigintegernullable_to_string, null).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == 998).First());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Null(find.bigintegernullable_to_string);
+
+            //delete
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == 998).ExecuteAffrows());
+            Assert.Equal(0, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == 2004).ExecuteAffrows());
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.bigintegernullable_to_string == null).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void TimeSpan1()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.timespan_to_string, find.timespan_to_string);
+            Assert.Equal(TimeSpan.Zero, find.timespan_to_string);
+
+            item = new ToStringMap { timespan_to_string = TimeSpan.FromDays(1) };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.timespan_to_string, find.timespan_to_string);
+            Assert.Equal(TimeSpan.FromDays(1), find.timespan_to_string);
+
+            //update all
+            item.timespan_to_string = TimeSpan.FromHours(10);
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.timespan_to_string, find.timespan_to_string);
+            Assert.Equal(TimeSpan.FromHours(10), find.timespan_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.timespan_to_string, TimeSpan.FromHours(11)).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(TimeSpan.FromHours(11), find.timespan_to_string);
+
+            //delete
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void TimeSpanNullable()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.timespannullable_to_string, find.timespannullable_to_string);
+            Assert.Null(find.timespannullable_to_string);
+
+            item = new ToStringMap { timespannullable_to_string = TimeSpan.FromDays(1) };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.timespannullable_to_string, find.timespannullable_to_string);
+            Assert.Equal(TimeSpan.FromDays(1), find.timespannullable_to_string);
+
+            //update all
+            item.timespannullable_to_string = TimeSpan.FromHours(10);
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.timespannullable_to_string, find.timespannullable_to_string);
+            Assert.Equal(TimeSpan.FromHours(10), find.timespannullable_to_string);
+
+            item.timespannullable_to_string = null;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.timespannullable_to_string, find.timespannullable_to_string);
+            Assert.Null(find.timespannullable_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.timespannullable_to_string, TimeSpan.FromHours(11)).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(TimeSpan.FromHours(11), find.timespannullable_to_string);
+
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.timespannullable_to_string, null).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Null(find.timespannullable_to_string);
+
+            //delete
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void DateTime1()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.datetime_to_string, find.datetime_to_string);
+            Assert.Equal(DateTime.MinValue, find.datetime_to_string);
+
+            item = new ToStringMap { datetime_to_string = DateTime.Parse("2000-1-1") };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.datetime_to_string, find.datetime_to_string);
+            Assert.Equal(DateTime.Parse("2000-1-1"), find.datetime_to_string);
+
+            //update all
+            item.datetime_to_string = DateTime.Parse("2000-1-11");
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.datetime_to_string, find.datetime_to_string);
+            Assert.Equal(DateTime.Parse("2000-1-11"), find.datetime_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.datetime_to_string, DateTime.Parse("2000-1-12")).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(DateTime.Parse("2000-1-12"), find.datetime_to_string);
+
+            //delete
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void DateTimeNullable()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.datetimenullable_to_string, find.datetimenullable_to_string);
+            Assert.Null(find.datetimenullable_to_string);
+
+            item = new ToStringMap { datetimenullable_to_string = DateTime.Parse("2000-1-1") };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.datetimenullable_to_string, find.datetimenullable_to_string);
+            Assert.Equal(DateTime.Parse("2000-1-1"), find.datetimenullable_to_string);
+
+            //update all
+            item.datetimenullable_to_string = DateTime.Parse("2000-1-11");
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.datetimenullable_to_string, find.datetimenullable_to_string);
+            Assert.Equal(DateTime.Parse("2000-1-11"), find.datetimenullable_to_string);
+
+            item.datetimenullable_to_string = null;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.datetimenullable_to_string, find.datetimenullable_to_string);
+            Assert.Null(find.datetimenullable_to_string);
+
+            //update set
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.datetimenullable_to_string, DateTime.Parse("2000-1-12")).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(DateTime.Parse("2000-1-12"), find.datetimenullable_to_string);
+
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.datetimenullable_to_string, null).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Null(find.datetimenullable_to_string);
+
+            //delete
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+
+        [Fact]
+        public void Guid1()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guid_to_string == Guid.Empty).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.guid_to_string, find.guid_to_string);
+            Assert.Equal(Guid.Empty, find.guid_to_string);
+
+            var newid = Guid.NewGuid();
+            item = new ToStringMap { guid_to_string = newid };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guid_to_string == newid).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.guid_to_string, find.guid_to_string);
+            Assert.Equal(newid, find.guid_to_string);
+
+            //update all
+            newid = Guid.NewGuid();
+            item.guid_to_string = newid;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guid_to_string == newid).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.guid_to_string, find.guid_to_string);
+            Assert.Equal(newid, find.guid_to_string);
+
+            //update set
+            newid = Guid.NewGuid();
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.guid_to_string, newid).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guid_to_string == newid).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(newid, find.guid_to_string);
+
+            //delete
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.guid_to_string == newid).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+        [Fact]
+        public void GuidNullable()
+        {
+            //insert
+            var orm = g.dameng;
+            var item = new ToStringMap { };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            var find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guidnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.guidnullable_to_string, find.guidnullable_to_string);
+            Assert.Null(find.guidnullable_to_string);
+
+            var newid = Guid.NewGuid();
+            item = new ToStringMap { guidnullable_to_string = newid };
+            Assert.Equal(1, orm.Insert<ToStringMap>().AppendData(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guidnullable_to_string == newid).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.guidnullable_to_string, find.guidnullable_to_string);
+            Assert.Equal(newid, find.guidnullable_to_string);
+
+            //update all
+            newid = Guid.NewGuid();
+            item.guidnullable_to_string = newid;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guidnullable_to_string == newid).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.guidnullable_to_string, find.guidnullable_to_string);
+            Assert.Equal(newid, find.guidnullable_to_string);
+
+            item.guidnullable_to_string = null;
+            Assert.Equal(1, orm.Update<ToStringMap>().SetSource(item).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guidnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(item.guidnullable_to_string, find.guidnullable_to_string);
+            Assert.Null(find.guidnullable_to_string);
+
+            //update set
+            newid = Guid.NewGuid();
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.guidnullable_to_string, newid).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guidnullable_to_string == newid).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Equal(newid, find.guidnullable_to_string);
+
+            Assert.Equal(1, orm.Update<ToStringMap>().Where(a => a.id == item.id).Set(a => a.guidnullable_to_string, null).ExecuteAffrows());
+            find = orm.Select<ToStringMap>().Where(a => a.id == item.id && a.guidnullable_to_string == null).First();
+            Assert.NotNull(find);
+            Assert.Equal(item.id, find.id);
+            Assert.Null(find.guidnullable_to_string);
+
+            //delete
+            Assert.Equal(1, orm.Delete<ToStringMap>().Where(a => a.id == item.id && a.guidnullable_to_string == null).ExecuteAffrows());
+            Assert.Null(orm.Select<ToStringMap>().Where(a => a.id == item.id).First());
+        }
+    }
+}

FreeSql.Tests/FreeSql.Tests/FreeSql.Tests.csproj

@@ -34,6 +34,7 @@
 	  <ProjectReference Include="..\..\Extensions\FreeSql.Extensions.Linq\FreeSql.Extensions.Linq.csproj" />
 	  <ProjectReference Include="..\..\FreeSql.DbContext\FreeSql.DbContext.csproj" />
 	  <ProjectReference Include="..\..\FreeSql\FreeSql.csproj" />
+	  <ProjectReference Include="..\..\Providers\FreeSql.Provider.Dameng\FreeSql.Provider.Dameng.csproj" />
 	  <ProjectReference Include="..\..\Providers\FreeSql.Provider.MsAccess\FreeSql.Provider.MsAccess.csproj" />
 	  <ProjectReference Include="..\..\Providers\FreeSql.Provider.MySql\FreeSql.Provider.MySql.csproj" />
 	  <ProjectReference Include="..\..\Providers\FreeSql.Provider.Oracle\FreeSql.Provider.Oracle.csproj" />
@@ -42,4 +43,10 @@
 	  <ProjectReference Include="..\..\Providers\FreeSql.Provider.SqlServer\FreeSql.Provider.SqlServer.csproj" />
 	</ItemGroup>
 
+	<ItemGroup>
+	  <Reference Include="DmProvider">
+	    <HintPath>..\..\Providers\FreeSql.Provider.Dameng\lib\DmProvider\netstandard2.0\DmProvider.dll</HintPath>
+	  </Reference>
+	</ItemGroup>
+
 </Project>

FreeSql.Tests/FreeSql.Tests/g.cs

@@ -105,4 +105,19 @@ public class g
             )
         .Build());
     public static IFreeSql msaccess => msaccessLazy.Value;
+
+
+    static Lazy<IFreeSql> damengLazy = new Lazy<IFreeSql>(() => new FreeSql.FreeSqlBuilder()
+    .UseConnectionString(FreeSql.DataType.Dameng, "server=127.0.0.1;port=5236;user id=2user;password=123456789;database=2user;poolsize=5")
+     //.UseConnectionFactory(FreeSql.DataType.Dameng, () => new Dm.DmConnection("data source=127.0.0.1:5236;user id=2user;password=123456789;Pooling=true;Max Pool Size=2"))
+     .UseAutoSyncStructure(true)
+    .UseLazyLoading(true)
+    .UseNameConvert(FreeSql.Internal.NameConvertType.ToUpper)
+    //.UseNoneCommandParameter(true)
+
+    .UseMonitorCommand(
+        cmd => Trace.WriteLine(cmd.CommandText), //监听SQL命令对象，在执行前
+        (cmd, traceLog) => Console.WriteLine(traceLog))
+    .Build());
+    public static IFreeSql dameng => damengLazy.Value;
 }

FreeSql.sln

@@ -78,6 +78,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FreeSql.All", "FreeSql.All\
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FreeSql.Extensions.Linq", "Extensions\FreeSql.Extensions.Linq\FreeSql.Extensions.Linq.csproj", "{57B3F5B0-D46A-4442-8EC6-9A9A784404B7}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FreeSql.Provider.Dameng", "Providers\FreeSql.Provider.Dameng\FreeSql.Provider.Dameng.csproj", "{E74D90E8-1CBC-4677-817B-1CA05AB97937}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -472,6 +474,18 @@ Global
 		{57B3F5B0-D46A-4442-8EC6-9A9A784404B7}.Release|x64.Build.0 = Release|Any CPU
 		{57B3F5B0-D46A-4442-8EC6-9A9A784404B7}.Release|x86.ActiveCfg = Release|Any CPU
 		{57B3F5B0-D46A-4442-8EC6-9A9A784404B7}.Release|x86.Build.0 = Release|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Debug|x64.Build.0 = Debug|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Debug|x86.Build.0 = Debug|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Release|x64.ActiveCfg = Release|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Release|x64.Build.0 = Release|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Release|x86.ActiveCfg = Release|Any CPU
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -499,6 +513,7 @@ Global
 		{B397A761-F646-41CF-A160-AB6C05DAF2FB} = {2A381C57-2697-427B-9F10-55DA11FD02E4}
 		{773D5B63-DE6E-46DB-AF16-6FB1C1352B3F} = {4A92E8A6-9A6D-41A1-9CDA-DE10899648AA}
 		{57B3F5B0-D46A-4442-8EC6-9A9A784404B7} = {4A92E8A6-9A6D-41A1-9CDA-DE10899648AA}
+		{E74D90E8-1CBC-4677-817B-1CA05AB97937} = {2A381C57-2697-427B-9F10-55DA11FD02E4}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {089687FD-5D25-40AB-BA8A-A10D1E137F98}

FreeSql/DataType.cs

@@ -22,7 +22,7 @@ namespace FreeSql
         Odbc,
 
         /// <summary>
-        /// 武汉达梦数据库有限公司
+        /// 武汉达梦数据库有限公司，基于 Odbc 的实现
         /// </summary>
         OdbcDameng,
 
@@ -30,5 +30,10 @@ namespace FreeSql
         /// Microsoft Office Access 是由微软发布的关联式数据库管理系统
         /// </summary>
         MsAccess,
+
+        /// <summary>
+        /// 武汉达梦数据库有限公司，基于 DmProvider.dll 的实现
+        /// </summary>
+        Dameng
     }
 }

FreeSql/FreeSql.xml

@@ -533,7 +533,7 @@
         </member>
         <member name="F:FreeSql.DataType.OdbcDameng">
             <summary>
-            武汉达梦数据库有限公司
+            武汉达梦数据库有限公司，基于 Odbc 的实现
             </summary>
         </member>
         <member name="F:FreeSql.DataType.MsAccess">
@@ -541,6 +541,11 @@
             Microsoft Office Access 是由微软发布的关联式数据库管理系统
             </summary>
         </member>
+        <member name="F:FreeSql.DataType.Dameng">
+            <summary>
+            武汉达梦数据库有限公司，基于 DmProvider.dll 的实现
+            </summary>
+        </member>
         <member name="M:FreeSql.Extensions.EntityUtil.EntityUtilExtensions.GetEntityKeyString(IFreeSql,System.Type,System.Object,System.Boolean,System.String)">
             <summary>
             获取实体的主键值，以 "*|_,[,_|*" 分割，当任意一个主键属性无值时，返回 null

FreeSql/FreeSqlBuilder.cs

@@ -216,6 +216,11 @@ namespace FreeSql
                         if (type == null) throwNotFind("FreeSql.Provider.MsAccess.dll", "FreeSql.MsAccess.MsAccessProvider<>");
                         break;
 
+                    case DataType.Dameng:
+                        type = Type.GetType("FreeSql.Dameng.DamengProvider`1,FreeSql.Provider.Dameng")?.MakeGenericType(typeof(TMark));
+                        if (type == null) throwNotFind("FreeSql.Provider.Dameng.dll", "FreeSql.Dameng.DamengProvider<>");
+                        break;
+
                     default: throw new Exception("未指定 UseConnectionString 或者 UseConnectionFactory");
                 }
             }

FreeSql/Internal/CommonProvider/SelectProvider/Select0Provider.cs

@@ -803,7 +803,7 @@ namespace FreeSql.Internal.CommonProvider
                     var propGetSetMethod = prop.GetSetMethod(true);
                     Expression readExpAssign = null; //加速缓存
                     if (prop.PropertyType.IsArray) readExpAssign = Expression.New(Utils.RowInfo.Constructor,
-                        Utils.GetDataReaderValueBlockExpression(prop.PropertyType, Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp)),
+                        Utils.GetDataReaderValueBlockExpression(prop.PropertyType, Expression.Call(Utils.MethodDataReaderGetValue, new Expression[] { Expression.Constant(_commonUtils), rowExp, dataIndexExp })),
                         //Expression.Call(Utils.MethodGetDataReaderValue, new Expression[] { Expression.Constant(prop.PropertyType), Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp) }),
                         Expression.Add(dataIndexExp, Expression.Constant(1))
                     );
@@ -813,7 +813,7 @@ namespace FreeSql.Internal.CommonProvider
                         if (proptypeGeneric.IsNullableType()) proptypeGeneric = proptypeGeneric.GetGenericArguments().First();
                         if (proptypeGeneric.IsEnum ||
                             Utils.dicExecuteArrayRowReadClassOrTuple.ContainsKey(proptypeGeneric)) readExpAssign = Expression.New(Utils.RowInfo.Constructor,
-                                Utils.GetDataReaderValueBlockExpression(prop.PropertyType, Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp)),
+                                Utils.GetDataReaderValueBlockExpression(prop.PropertyType, Expression.Call(Utils.MethodDataReaderGetValue, new Expression[] { Expression.Constant(_commonUtils), rowExp, dataIndexExp })),
                                 //Expression.Call(Utils.MethodGetDataReaderValue, new Expression[] { Expression.Constant(prop.PropertyType), Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp) }),
                                 Expression.Add(dataIndexExp, Expression.Constant(1))
                         );
@@ -1069,6 +1069,7 @@ namespace FreeSql.Internal.CommonProvider
                 case DataType.Sqlite:
                     break;
                 case DataType.OdbcDameng:
+                case DataType.Dameng:
                     _tosqlAppendContent = $" for update{(noawait ? " nowait" : "")}";
                     break;
             }

FreeSql/Internal/UtilsExpressionTree.cs

@@ -1235,7 +1235,12 @@ namespace FreeSql.Internal
             public static PropertyInfo PropertyValue = typeof(RowInfo).GetProperty("Value");
             public static PropertyInfo PropertyDataIndex = typeof(RowInfo).GetProperty("DataIndex");
         }
-        internal static MethodInfo MethodDataReaderGetValue = typeof(DbDataReader).GetMethod("GetValue");
+        internal static MethodInfo MethodDataReaderGetValue = typeof(Utils).GetMethod("InternalDataReaderGetValue", BindingFlags.Static | BindingFlags.NonPublic);
+        internal static object InternalDataReaderGetValue(CommonUtils commonUtil, DbDataReader dr, int index)
+        {
+            if (commonUtil._orm.Ado.DataType == DataType.Dameng && dr.IsDBNull(index)) return null;
+            return dr.GetValue(index);
+        }
         internal static RowInfo ExecuteArrayRowReadClassOrTuple(string flagStr, Type typeOrg, int[] indexes, DbDataReader row, int dataIndex, CommonUtils _commonUtils)
         {
             if (string.IsNullOrEmpty(flagStr)) flagStr = "all";
@@ -1252,8 +1257,8 @@ namespace FreeSql.Internal
 
                     if (type.IsArray) return Expression.Lambda<Func<Type, int[], DbDataReader, int, CommonUtils, RowInfo>>(
                         Expression.New(RowInfo.Constructor,
-                            GetDataReaderValueBlockExpression(type, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp)),
+                            GetDataReaderValueBlockExpression(type, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp })),
-                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { typeExp, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp) }),
+                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { typeExp, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp }) }),
                             Expression.Add(dataIndexExp, Expression.Constant(1))
                         ), new[] { typeExp, indexesExp, rowExp, dataIndexExp, commonUtilExp }).Compile();
 
@@ -1263,8 +1268,8 @@ namespace FreeSql.Internal
                         dicExecuteArrayRowReadClassOrTuple.ContainsKey(typeGeneric))
                         return Expression.Lambda<Func<Type, int[], DbDataReader, int, CommonUtils, RowInfo>>(
                         Expression.New(RowInfo.Constructor,
-                            GetDataReaderValueBlockExpression(type, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp)),
+                            GetDataReaderValueBlockExpression(type, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp })),
-                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { typeExp, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp) }),
+                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { typeExp, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp }) }),
                             Expression.Add(dataIndexExp, Expression.Constant(1))
                         ), new[] { typeExp, indexesExp, rowExp, dataIndexExp, commonUtilExp }).Compile();
 
@@ -1284,8 +1289,8 @@ namespace FreeSql.Internal
                             {
                                 Expression read2ExpAssign = null; //加速缓存
                                 if (field.FieldType.IsArray) read2ExpAssign = Expression.New(RowInfo.Constructor,
-                                    GetDataReaderValueBlockExpression(field.FieldType, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp)),
+                                    GetDataReaderValueBlockExpression(field.FieldType, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp })),
-                                    //Expression.Call(MethodGetDataReaderValue, new Expression[] { Expression.Constant(field.FieldType), Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp) }),
+                                    //Expression.Call(MethodGetDataReaderValue, new Expression[] { Expression.Constant(field.FieldType), Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp }) }),
                                     Expression.Add(dataIndexExp, Expression.Constant(1))
                                 );
                                 else
@@ -1294,8 +1299,8 @@ namespace FreeSql.Internal
                                     if (fieldtypeGeneric.IsNullableType()) fieldtypeGeneric = fieldtypeGeneric.GetGenericArguments().First();
                                     if (fieldtypeGeneric.IsEnum ||
                                         dicExecuteArrayRowReadClassOrTuple.ContainsKey(fieldtypeGeneric)) read2ExpAssign = Expression.New(RowInfo.Constructor,
-                                            GetDataReaderValueBlockExpression(field.FieldType, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp)),
+                                            GetDataReaderValueBlockExpression(field.FieldType, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp })),
-                                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { Expression.Constant(field.FieldType), Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp) }),
+                                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { Expression.Constant(field.FieldType), Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp }) }),
                                             Expression.Add(dataIndexExp, Expression.Constant(1))
                                     );
                                     else
@@ -1336,8 +1341,8 @@ namespace FreeSql.Internal
                                 Expression.IfThen(
                                     Expression.LessThan(dataIndexExp, rowLenExp),
                                         Expression.Return(returnTarget, Expression.New(RowInfo.Constructor,
-                                            GetDataReaderValueBlockExpression(type, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp)),
+                                            GetDataReaderValueBlockExpression(type, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp })),
-                                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { typeExp, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp) }),
+                                            //Expression.Call(MethodGetDataReaderValue, new Expression[] { typeExp, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp }) }),
                                             Expression.Add(dataIndexExp, Expression.Constant(1))))
                                 ),
                                 Expression.Label(returnTarget, Expression.Default(typeof(RowInfo)))
@@ -1391,7 +1396,7 @@ namespace FreeSql.Internal
                             var readType = typetb.ColumnsByCs.TryGetValue(ctorParm.Name, out var trycol) ? trycol.Attribute.MapType : ctorParm.ParameterType;
 
                             var ispkExp = new List<Expression>();
-                            Expression readVal = Expression.Assign(readpkvalExp, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp));
+                            Expression readVal = Expression.Assign(readpkvalExp, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp }));
                             Expression readExpAssign = null; //加速缓存
                             if (readType.IsArray) readExpAssign = Expression.New(RowInfo.Constructor,
                                 GetDataReaderValueBlockExpression(readType, readpkvalExp),
@@ -1407,7 +1412,7 @@ namespace FreeSql.Internal
                                 {
 
                                     //判断主键为空，则整个对象不读取
-                                    //blockExp.Add(Expression.Assign(readpkvalExp, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp)));
+                                    //blockExp.Add(Expression.Assign(readpkvalExp, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp })));
                                     if (trycol?.Attribute.IsPrimary == true)
                                     {
                                         ispkExp.Add(
@@ -1498,7 +1503,7 @@ namespace FreeSql.Internal
 
                             var ispkExp = new List<Expression>();
                             var propGetSetMethod = prop.GetSetMethod(true);
-                            Expression readVal = Expression.Assign(readpkvalExp, Expression.Call(rowExp, MethodDataReaderGetValue, tryidxExp));
+                            Expression readVal = Expression.Assign(readpkvalExp, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, tryidxExp }));
                             Expression readExpAssign = null; //加速缓存
                             if (readType.IsArray) readExpAssign = Expression.New(RowInfo.Constructor,
                                 GetDataReaderValueBlockExpression(readType, readpkvalExp),
@@ -1514,7 +1519,7 @@ namespace FreeSql.Internal
                                 {
 
                                     //判断主键为空，则整个对象不读取
-                                    //blockExp.Add(Expression.Assign(readpkvalExp, Expression.Call(rowExp, MethodDataReaderGetValue, dataIndexExp)));
+                                    //blockExp.Add(Expression.Assign(readpkvalExp, Expression.Call(MethodDataReaderGetValue, new Expression[] { commonUtilExp, rowExp, dataIndexExp })));
                                     if (flagStr.StartsWith("adoQuery") == false && //Ado.Query 的时候不作此判断
                                         trycol?.Attribute.IsPrimary == true) //若主键值为 null，则整行读取出来的对象为 null
                                     {

Providers/FreeSql.Provider.Dameng/Curd/DamengDelete.cs

@@ -0,0 +1,31 @@
+using FreeSql.Internal;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FreeSql.Dameng.Curd
+{
+
+    class DamengDelete<T1> : Internal.CommonProvider.DeleteProvider<T1> where T1 : class
+    {
+        public DamengDelete(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere)
+            : base(orm, commonUtils, commonExpression, dywhere)
+        {
+        }
+
+        public override List<T1> ExecuteDeleted()
+        {
+            throw new NotImplementedException();
+        }
+
+#if net40
+#else
+        public override Task<List<T1>> ExecuteDeletedAsync()
+        {
+            throw new NotImplementedException();
+        }
+#endif
+    }
+}

Providers/FreeSql.Provider.Dameng/Curd/DamengInsert.cs

@@ -0,0 +1,222 @@
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FreeSql.Dameng.Curd
+{
+
+    class DamengInsert<T1> : Internal.CommonProvider.InsertProvider<T1> where T1 : class
+    {
+        public DamengInsert(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression)
+            : base(orm, commonUtils, commonExpression)
+        {
+        }
+
+        public override int ExecuteAffrows() => base.SplitExecuteAffrows(_batchValuesLimit > 0 ? _batchValuesLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 999);
+        public override long ExecuteIdentity() => base.SplitExecuteIdentity(_batchValuesLimit > 0 ? _batchValuesLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 999);
+        public override List<T1> ExecuteInserted() => base.SplitExecuteInserted(_batchValuesLimit > 0 ? _batchValuesLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 999);
+
+        public override string ToSql()
+        {
+            if (_source == null || _source.Any() == false) return null;
+            var sb = new StringBuilder();
+            sb.Append("INSERT ");
+            if (_source.Count > 1) sb.Append("ALL");
+
+            _identCol = null;
+            var sbtb = new StringBuilder();
+            sbtb.Append("INTO ");
+            sbtb.Append(_commonUtils.QuoteSqlName(TableRuleInvoke())).Append("(");
+            var colidx = 0;
+            foreach (var col in _table.Columns.Values)
+            {
+                if (col.Attribute.IsIdentity) _identCol = col;
+                if (col.Attribute.IsIdentity && _insertIdentity == false && string.IsNullOrEmpty(col.DbInsertValue)) continue;
+                if (col.Attribute.IsIdentity == false && _ignore.ContainsKey(col.Attribute.Name)) continue;
+
+                if (colidx > 0) sbtb.Append(", ");
+                sbtb.Append(_commonUtils.QuoteSqlName(col.Attribute.Name));
+                ++colidx;
+            }
+            sbtb.Append(") ");
+
+            _params = _noneParameter ? new DbParameter[0] : new DbParameter[colidx * _source.Count];
+            var specialParams = new List<DbParameter>();
+            var didx = 0;
+            foreach (var d in _source)
+            {
+                if (_source.Count > 1) sb.Append("\r\n");
+                sb.Append(sbtb);
+                sb.Append("VALUES");
+                sb.Append("(");
+                var colidx2 = 0;
+                foreach (var col in _table.Columns.Values)
+                {
+                    if (col.Attribute.IsIdentity && _insertIdentity == false && string.IsNullOrEmpty(col.DbInsertValue)) continue;
+                    if (col.Attribute.IsIdentity == false && _ignore.ContainsKey(col.Attribute.Name)) continue;
+
+                    if (colidx2 > 0) sb.Append(", ");
+                    if (string.IsNullOrEmpty(col.DbInsertValue) == false)
+                        sb.Append(col.DbInsertValue);
+                    else
+                    {
+                        object val = col.GetMapValue(d);
+                        if (_noneParameter)
+                            sb.Append(_commonUtils.GetNoneParamaterSqlValue(specialParams, col.Attribute.MapType, val));
+                        else
+                        {
+                            sb.Append(_commonUtils.QuoteWriteParamter(col.Attribute.MapType, _commonUtils.QuoteParamterName($"{col.CsName}_{didx}")));
+                            _params[didx * colidx + colidx2] = _commonUtils.AppendParamter(null, $"{col.CsName}_{didx}", col, col.Attribute.MapType, val);
+                        }
+                    }
+                    ++colidx2;
+                }
+                sb.Append(")");
+                ++didx;
+            }
+            if (_source.Count > 1) sb.Append("\r\n SELECT 1 FROM DUAL");
+            return sb.ToString();
+        }
+
+        ColumnInfo _identCol;
+        protected override long RawExecuteIdentity()
+        {
+            var sql = this.ToSql();
+            if (string.IsNullOrEmpty(sql)) return 0;
+
+            long ret = 0;
+            Exception exception = null;
+            Aop.CurdBeforeEventArgs before = null;
+
+            if (_identCol == null || _source.Count > 1)
+            {
+                before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, _params);
+                _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
+                try
+                {
+                    ret = _orm.Ado.ExecuteNonQuery(_connection, _transaction, CommandType.Text, sql, _params);
+                }
+                catch (Exception ex)
+                {
+                    exception = ex;
+                    throw ex;
+                }
+                finally
+                {
+                    var after = new Aop.CurdAfterEventArgs(before, exception, ret);
+                    _orm.Aop.CurdAfterHandler?.Invoke(this, after);
+                }
+                return 0;
+            }
+            var identColName = _commonUtils.QuoteSqlName(_identCol.Attribute.Name);
+            var identParam = _commonUtils.AppendParamter(null, $"{_identCol.CsName}99", _identCol, _identCol.Attribute.MapType, 0);
+            identParam.Direction = ParameterDirection.Output;
+            sql = $"{sql} RETURNING {identColName} INTO {identParam.ParameterName}";
+            var dbParms = _params.Concat(new[] { identParam }).ToArray();
+            before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, dbParms);
+            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
+            try
+            {
+                _orm.Ado.ExecuteNonQuery(_connection, _transaction, CommandType.Text, sql, dbParms);
+                long.TryParse(string.Concat(identParam.Value), out ret);
+            }
+            catch (Exception ex)
+            {
+                exception = ex;
+                throw ex;
+            }
+            finally
+            {
+                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
+                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
+            }
+            return ret;
+        }
+
+        protected override List<T1> RawExecuteInserted()
+        {
+            var sql = this.ToSql();
+            if (string.IsNullOrEmpty(sql)) return new List<T1>();
+
+            var ret = _source.ToList();
+            this.RawExecuteAffrows();
+            return ret;
+        }
+
+#if net40
+#else
+        public override Task<int> ExecuteAffrowsAsync() => base.SplitExecuteAffrowsAsync(500, 999);
+        public override Task<long> ExecuteIdentityAsync() => base.SplitExecuteIdentityAsync(500, 999);
+        public override Task<List<T1>> ExecuteInsertedAsync() => base.SplitExecuteInsertedAsync(500, 999);
+
+        async protected override Task<long> RawExecuteIdentityAsync()
+        {
+            var sql = this.ToSql();
+            if (string.IsNullOrEmpty(sql)) return 0;
+
+            long ret = 0;
+            Exception exception = null;
+            Aop.CurdBeforeEventArgs before = null;
+
+            if (_identCol == null || _source.Count > 1)
+            {
+                before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, _params);
+                _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
+                try
+                {
+                    ret = await _orm.Ado.ExecuteNonQueryAsync(_connection, _transaction, CommandType.Text, sql, _params);
+                }
+                catch (Exception ex)
+                {
+                    exception = ex;
+                    throw ex;
+                }
+                finally
+                {
+                    var after = new Aop.CurdAfterEventArgs(before, exception, ret);
+                    _orm.Aop.CurdAfterHandler?.Invoke(this, after);
+                }
+                return 0;
+            }
+            var identColName = _commonUtils.QuoteSqlName(_identCol.Attribute.Name);
+            var identParam = _commonUtils.AppendParamter(null, $"{_identCol.CsName}99", _identCol, _identCol.Attribute.MapType, 0);
+            identParam.Direction = ParameterDirection.Output;
+            sql = $"{sql} RETURNING {identColName} INTO {identParam.ParameterName}";
+            var dbParms = _params.Concat(new[] { identParam }).ToArray();
+            before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, dbParms);
+            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
+            try
+            {
+                await _orm.Ado.ExecuteNonQueryAsync(_connection, _transaction, CommandType.Text, sql, dbParms);
+                long.TryParse(string.Concat(identParam.Value), out ret);
+            }
+            catch (Exception ex)
+            {
+                exception = ex;
+                throw ex;
+            }
+            finally
+            {
+                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
+                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
+            }
+            return ret;
+        }
+        async protected override Task<List<T1>> RawExecuteInsertedAsync()
+        {
+            var sql = this.ToSql();
+            if (string.IsNullOrEmpty(sql)) return new List<T1>();
+
+            var ret = _source.ToList();
+            await this.RawExecuteAffrowsAsync();
+            return ret;
+        }
+#endif
+    }
+}

Providers/FreeSql.Provider.Dameng/Curd/DamengSelect.cs

@@ -0,0 +1,184 @@
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+
+namespace FreeSql.Dameng.Curd
+{
+
+    class DamengSelect<T1> : FreeSql.Internal.CommonProvider.Select1Provider<T1> where T1 : class
+    {
+
+        internal static string ToSqlStatic(CommonUtils _commonUtils, CommonExpression _commonExpression, string _select, bool _distinct, string field, StringBuilder _join, StringBuilder _where, string _groupby, string _having, string _orderby, int _skip, int _limit, List<SelectTableInfo> _tables, List<Dictionary<Type, string>> tbUnions, Func<Type, string, string> _aliasRule, string _tosqlAppendContent, List<LambdaExpression> _whereCascadeExpression, IFreeSql _orm)
+        {
+            if (_orm.CodeFirst.IsAutoSyncStructure)
+                _orm.CodeFirst.SyncStructure(_tables.Select(a => a.Table.Type).ToArray());
+
+            if (_whereCascadeExpression.Any())
+                foreach (var tb in _tables.Where(a => a.Type != SelectTableInfoType.Parent))
+                    tb.Cascade = _commonExpression.GetWhereCascadeSql(tb, _whereCascadeExpression);
+
+            var sb = new StringBuilder();
+            var tbUnionsGt0 = tbUnions.Count > 1;
+            for (var tbUnionsIdx = 0; tbUnionsIdx < tbUnions.Count; tbUnionsIdx++)
+            {
+                if (tbUnionsIdx > 0) sb.Append(" \r\n\r\nUNION ALL\r\n\r\n");
+                if (tbUnionsGt0) sb.Append(_select).Append(" * from (");
+                var tbUnion = tbUnions[tbUnionsIdx];
+
+                var sbnav = new StringBuilder();
+                sb.Append(_select);
+                if (_distinct) sb.Append("DISTINCT ");
+                sb.Append(field);
+                if (string.IsNullOrEmpty(_orderby) && _skip > 0) sb.Append(", ROWNUM AS \"__rownum__\"");
+                sb.Append(" \r\nFROM ");
+                var tbsjoin = _tables.Where(a => a.Type != SelectTableInfoType.From).ToArray();
+                var tbsfrom = _tables.Where(a => a.Type == SelectTableInfoType.From).ToArray();
+                for (var a = 0; a < tbsfrom.Length; a++)
+                {
+                    sb.Append(_commonUtils.QuoteSqlName(tbUnion[tbsfrom[a].Table.Type])).Append(" ").Append(_aliasRule?.Invoke(tbsfrom[a].Table.Type, tbsfrom[a].Alias) ?? tbsfrom[a].Alias);
+                    if (tbsjoin.Length > 0)
+                    {
+                        //如果存在 join 查询，则处理 from t1, t2 改为 from t1 inner join t2 on 1 = 1
+                        for (var b = 1; b < tbsfrom.Length; b++)
+                        {
+                            sb.Append(" \r\nLEFT JOIN ").Append(_commonUtils.QuoteSqlName(tbUnion[tbsfrom[b].Table.Type])).Append(" ").Append(_aliasRule?.Invoke(tbsfrom[b].Table.Type, tbsfrom[b].Alias) ?? tbsfrom[b].Alias);
+
+                            if (string.IsNullOrEmpty(tbsfrom[b].NavigateCondition) && string.IsNullOrEmpty(tbsfrom[b].On) && string.IsNullOrEmpty(tbsfrom[b].Cascade)) sb.Append(" ON 1 = 1");
+                            else
+                            {
+                                var onSql = tbsfrom[b].NavigateCondition ?? tbsfrom[b].On;
+                                sb.Append(" ON ").Append(onSql);
+                                if (string.IsNullOrEmpty(tbsfrom[b].Cascade) == false)
+                                {
+                                    if (string.IsNullOrEmpty(onSql)) sb.Append(tbsfrom[b].Cascade);
+                                    else sb.Append(" AND (").Append(tbsfrom[b].Cascade).Append(")");
+                                }
+                            }
+                        }
+                        break;
+                    }
+                    else
+                    {
+                        if (!string.IsNullOrEmpty(tbsfrom[a].NavigateCondition)) sbnav.Append(" AND (").Append(tbsfrom[a].NavigateCondition).Append(")");
+                        if (!string.IsNullOrEmpty(tbsfrom[a].On)) sbnav.Append(" AND (").Append(tbsfrom[a].On).Append(")");
+                        if (a > 0 && !string.IsNullOrEmpty(tbsfrom[a].Cascade)) sbnav.Append(" AND (").Append(tbsfrom[a].Cascade).Append(")");
+                    }
+                    if (a < tbsfrom.Length - 1) sb.Append(", ");
+                }
+                foreach (var tb in tbsjoin)
+                {
+                    if (tb.Type == SelectTableInfoType.Parent) continue;
+                    switch (tb.Type)
+                    {
+                        case SelectTableInfoType.LeftJoin:
+                            sb.Append(" \r\nLEFT JOIN ");
+                            break;
+                        case SelectTableInfoType.InnerJoin:
+                            sb.Append(" \r\nINNER JOIN ");
+                            break;
+                        case SelectTableInfoType.RightJoin:
+                            sb.Append(" \r\nRIGHT JOIN ");
+                            break;
+                    }
+                    sb.Append(_commonUtils.QuoteSqlName(tbUnion[tb.Table.Type])).Append(" ").Append(_aliasRule?.Invoke(tb.Table.Type, tb.Alias) ?? tb.Alias).Append(" ON ").Append(tb.On ?? tb.NavigateCondition);
+                    if (!string.IsNullOrEmpty(tb.Cascade)) sb.Append(" AND (").Append(tb.Cascade).Append(")");
+                    if (!string.IsNullOrEmpty(tb.On) && !string.IsNullOrEmpty(tb.NavigateCondition)) sbnav.Append(" AND (").Append(tb.NavigateCondition).Append(")");
+                }
+                if (_join.Length > 0) sb.Append(_join);
+
+                sbnav.Append(_where);
+                if (!string.IsNullOrEmpty(_tables[0].Cascade))
+                    sbnav.Append(" AND (").Append(_tables[0].Cascade).Append(")");
+
+                if (string.IsNullOrEmpty(_orderby) && (_skip > 0 || _limit > 0))
+                    sbnav.Append(" AND ROWNUM < ").Append(_skip + _limit + 1);
+                if (sbnav.Length > 0)
+                    sb.Append(" \r\nWHERE ").Append(sbnav.Remove(0, 5));
+                if (string.IsNullOrEmpty(_groupby) == false)
+                {
+                    sb.Append(_groupby);
+                    if (string.IsNullOrEmpty(_having) == false)
+                        sb.Append(" \r\nHAVING ").Append(_having.Substring(5));
+                }
+                sb.Append(_orderby);
+
+                if (string.IsNullOrEmpty(_orderby))
+                {
+                    if (_skip > 0)
+                        sb.Insert(0, $"{_select} t.* FROM (").Append(") t WHERE t.\"__rownum__\" > ").Append(_skip);
+                }
+                else
+                {
+                    if (_skip > 0 && _limit > 0) sb.Insert(0, $"{_select} t.* FROM (SELECT rt.*, ROWNUM AS \"__rownum__\" FROM (").Append(") rt WHERE ROWNUM < ").Append(_skip + _limit + 1).Append(") t WHERE t.\"__rownum__\" > ").Append(_skip);
+                    else if (_skip > 0) sb.Insert(0, $"{_select} t.* FROM (").Append(") t WHERE ROWNUM > ").Append(_skip);
+                    else if (_limit > 0) sb.Insert(0, $"{_select} t.* FROM (").Append(") t WHERE ROWNUM < ").Append(_limit + 1);
+                }
+
+                sbnav.Clear();
+                if (tbUnionsGt0) sb.Append(") ftb");
+            }
+            return sb.Append(_tosqlAppendContent).ToString();
+        }
+
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override ISelect<T1, T2> From<T2>(Expression<Func<ISelectFromExpression<T1>, T2, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3> From<T2, T3>(Expression<Func<ISelectFromExpression<T1>, T2, T3, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4> From<T2, T3, T4>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3, T4>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5> From<T2, T3, T4, T5>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3, T4, T5>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6> From<T2, T3, T4, T5, T6>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3, T4, T5, T6>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7> From<T2, T3, T4, T5, T6, T7>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3, T4, T5, T6, T7>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8> From<T2, T3, T4, T5, T6, T7, T8>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3, T4, T5, T6, T7, T8>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> From<T2, T3, T4, T5, T6, T7, T8, T9>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> From<T2, T3, T4, T5, T6, T7, T8, T9, T10>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new DamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(_orm, _commonUtils, _commonExpression, null); DamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override string ToSql(string field = null) => ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2> : FreeSql.Internal.CommonProvider.Select2Provider<T1, T2> where T1 : class where T2 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3> : FreeSql.Internal.CommonProvider.Select3Provider<T1, T2, T3> where T1 : class where T2 : class where T3 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3, T4> : FreeSql.Internal.CommonProvider.Select4Provider<T1, T2, T3, T4> where T1 : class where T2 : class where T3 : class where T4 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3, T4, T5> : FreeSql.Internal.CommonProvider.Select5Provider<T1, T2, T3, T4, T5> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3, T4, T5, T6> : FreeSql.Internal.CommonProvider.Select6Provider<T1, T2, T3, T4, T5, T6> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3, T4, T5, T6, T7> : FreeSql.Internal.CommonProvider.Select7Provider<T1, T2, T3, T4, T5, T6, T7> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3, T4, T5, T6, T7, T8> : FreeSql.Internal.CommonProvider.Select8Provider<T1, T2, T3, T4, T5, T6, T7, T8> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> : FreeSql.Internal.CommonProvider.Select9Provider<T1, T2, T3, T4, T5, T6, T7, T8, T9> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+    class DamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> : FreeSql.Internal.CommonProvider.Select10Provider<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class
+    {
+        public DamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public override string ToSql(string field = null) => DamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
+    }
+}

Providers/FreeSql.Provider.Dameng/Curd/DamengUpdate.cs

@@ -0,0 +1,77 @@
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FreeSql.Dameng.Curd
+{
+
+    class DamengUpdate<T1> : Internal.CommonProvider.UpdateProvider<T1> where T1 : class
+    {
+
+        public DamengUpdate(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere)
+            : base(orm, commonUtils, commonExpression, dywhere)
+        {
+        }
+
+        public override int ExecuteAffrows() => base.SplitExecuteAffrows(_batchRowsLimit > 0 ? _batchRowsLimit : 200, _batchParameterLimit > 0 ? _batchParameterLimit : 999);
+        public override List<T1> ExecuteUpdated() => base.SplitExecuteUpdated(_batchRowsLimit > 0 ? _batchRowsLimit : 200, _batchParameterLimit > 0 ? _batchParameterLimit : 999);
+
+
+        protected override List<T1> RawExecuteUpdated()
+        {
+            throw new NotImplementedException();
+        }
+
+        protected override void ToSqlCase(StringBuilder caseWhen, ColumnInfo[] primarys)
+        {
+            if (_table.Primarys.Length == 1)
+            {
+                var pk = _table.Primarys.First();
+                caseWhen.Append(_commonUtils.QuoteReadColumn(pk.CsType, pk.Attribute.MapType, _commonUtils.QuoteSqlName(pk.Attribute.Name)));
+                return;
+            }
+            caseWhen.Append("(");
+            var pkidx = 0;
+            foreach (var pk in _table.Primarys)
+            {
+                if (pkidx > 0) caseWhen.Append(" || '+' || ");
+                caseWhen.Append(_commonUtils.QuoteReadColumn(pk.CsType, pk.Attribute.MapType, _commonUtils.QuoteSqlName(pk.Attribute.Name)));
+                ++pkidx;
+            }
+            caseWhen.Append(")");
+        }
+
+        protected override void ToSqlWhen(StringBuilder sb, ColumnInfo[] primarys, object d)
+        {
+            if (_table.Primarys.Length == 1)
+            {
+                sb.Append(_commonUtils.FormatSql("{0}", _table.Primarys.First().GetMapValue(d)));
+                return;
+            }
+            sb.Append("(");
+            var pkidx = 0;
+            foreach (var pk in _table.Primarys)
+            {
+                if (pkidx > 0) sb.Append(" || '+' || ");
+                sb.Append(_commonUtils.FormatSql("{0}", pk.GetMapValue(d)));
+                ++pkidx;
+            }
+            sb.Append(")");
+        }
+
+#if net40
+#else
+        public override Task<int> ExecuteAffrowsAsync() => base.SplitExecuteAffrowsAsync(200, 999);
+        public override Task<List<T1>> ExecuteUpdatedAsync() => base.SplitExecuteUpdatedAsync(200, 999);
+
+        protected override Task<List<T1>> RawExecuteUpdatedAsync()
+        {
+            throw new NotImplementedException();
+        }
+#endif
+    }
+}

Providers/FreeSql.Provider.Dameng/DamengAdo/DamengAdo.cs

@@ -0,0 +1,75 @@
+using Dm;
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using FreeSql.Internal.ObjectPool;
+using System;
+using System.Collections;
+using System.Data.Common;
+using System.Threading;
+
+namespace FreeSql.Dameng
+{
+    class DamengAdo : FreeSql.Internal.CommonProvider.AdoProvider
+    {
+        public DamengAdo() : base(DataType.Dameng, null, null) { }
+        public DamengAdo(CommonUtils util, string masterConnectionString, string[] slaveConnectionStrings, Func<DbConnection> connectionFactory) : base(DataType.Dameng, masterConnectionString, slaveConnectionStrings)
+        {
+            base._util = util;
+            if (connectionFactory != null)
+            {
+                MasterPool = new FreeSql.Internal.CommonProvider.DbConnectionPool(DataType.Dameng, connectionFactory);
+                return;
+            }
+            if (!string.IsNullOrEmpty(masterConnectionString))
+                MasterPool = new DamengConnectionPool("主库", masterConnectionString, null, null);
+            if (slaveConnectionStrings != null)
+            {
+                foreach (var slaveConnectionString in slaveConnectionStrings)
+                {
+                    var slavePool = new DamengConnectionPool($"从库{SlavePools.Count + 1}", slaveConnectionString, () => Interlocked.Decrement(ref slaveUnavailables), () => Interlocked.Increment(ref slaveUnavailables));
+                    SlavePools.Add(slavePool);
+                }
+            }
+        }
+        public override object AddslashesProcessParam(object param, Type mapType, ColumnInfo mapColumn)
+        {
+            if (param == null) return "NULL";
+            if (mapType != null && mapType != param.GetType() && (param is IEnumerable == false))
+                param = Utils.GetDataReaderValue(mapType, param);
+
+            if (param is byte[])
+                return $"hextoraw('{CommonUtils.BytesSqlRaw(param as byte[])}')";
+            else if (param is bool || param is bool?)
+                return (bool)param ? 1 : 0;
+            else if (param is string || param is char)
+                return string.Concat("'", param.ToString().Replace("'", "''"), "'");
+            else if (param is Enum)
+                return ((Enum)param).ToInt64();
+            else if (decimal.TryParse(string.Concat(param), out var trydec))
+                return param;
+            else if (param is DateTime || param is DateTime?)
+                return string.Concat("to_timestamp('", ((DateTime)param).ToString("yyyy-MM-dd HH:mm:ss.ffffff"), "','YYYY-MM-DD HH24:MI:SS.FF6')");
+            else if (param is TimeSpan || param is TimeSpan?)
+                return $"numtodsinterval({((TimeSpan)param).Ticks * 1.0 / 10000000},'second')";
+            else if (param is IEnumerable)
+                return AddslashesIEnumerable(param, mapType, mapColumn);
+
+            return string.Concat("'", param.ToString().Replace("'", "''"), "'");
+            //if (param is string) return string.Concat('N', nparms[a]);
+        }
+
+        protected override DbCommand CreateCommand()
+        {
+            return new DmCommand();
+        }
+
+        protected override void ReturnConnection(IObjectPool<DbConnection> pool, Object<DbConnection> conn, Exception ex)
+        {
+            var rawPool = pool as DamengConnectionPool;
+            if (rawPool != null) rawPool.Return(conn, ex);
+            else pool.Return(conn);
+        }
+
+        protected override DbParameter[] GetDbParamtersByObject(string sql, object obj) => _util.GetDbParamtersByObject(sql, obj);
+    }
+}

Providers/FreeSql.Provider.Dameng/DamengAdo/DamengConnectionPool.cs

@@ -0,0 +1,253 @@
+using Dm;
+using FreeSql.Internal.ObjectPool;
+using System;
+using System.Collections.Concurrent;
+using System.Data;
+using System.Data.Common;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace FreeSql.Dameng
+{
+
+    class DamengConnectionPool : ObjectPool<DbConnection>
+    {
+
+        internal Action availableHandler;
+        internal Action unavailableHandler;
+        internal string UserId { get; set; }
+
+        public DamengConnectionPool(string name, string connectionString, Action availableHandler, Action unavailableHandler) : base(null)
+        {
+            this.UserId = DamengConnectionPool.GetUserId(connectionString);
+
+            this.availableHandler = availableHandler;
+            this.unavailableHandler = unavailableHandler;
+            var policy = new DamengConnectionPoolPolicy
+            {
+                _pool = this,
+                Name = name
+            };
+            this.Policy = policy;
+            policy.ConnectionString = connectionString;
+        }
+
+        public static string GetUserId(string connectionString)
+        {
+            var userIdMatch = Regex.Match(connectionString, @"(User\s+Id|Uid)\s*=\s*([^;]+)", RegexOptions.IgnoreCase);
+            if (userIdMatch.Success == false) throw new Exception(@"从 ConnectionString 中无法匹配 (User\s+Id|Uid)\s*=\s*([^;]+)");
+            return userIdMatch.Groups[2].Value.Trim().ToUpper();
+        }
+
+        public void Return(Object<DbConnection> obj, Exception exception, bool isRecreate = false)
+        {
+            if (exception != null && exception is DmException)
+            {
+                if (exception is System.IO.IOException)
+                {
+                    base.SetUnavailable(exception);
+                }
+                else if (obj.Value.Ping() == false)
+                {
+                    base.SetUnavailable(exception);
+                }
+            }
+            base.Return(obj, isRecreate);
+        }
+    }
+
+    class DamengConnectionPoolPolicy : IPolicy<DbConnection>
+    {
+
+        internal DamengConnectionPool _pool;
+        public string Name { get; set; } = "Dameng DmConnection 对象池";
+        public int PoolSize { get; set; } = 100;
+        public TimeSpan SyncGetTimeout { get; set; } = TimeSpan.FromSeconds(10);
+        public TimeSpan IdleTimeout { get; set; } = TimeSpan.FromSeconds(20);
+        public int AsyncGetCapacity { get; set; } = 10000;
+        public bool IsThrowGetTimeoutException { get; set; } = true;
+        public bool IsAutoDisposeWithSystem { get; set; } = true;
+        public int CheckAvailableInterval { get; set; } = 5;
+
+        static ConcurrentDictionary<string, int> dicConnStrIncr = new ConcurrentDictionary<string, int>(StringComparer.CurrentCultureIgnoreCase);
+        private string _connectionString;
+        public string ConnectionString
+        {
+            get => _connectionString;
+            set
+            {
+                _connectionString = value ?? "";
+
+                var pattern = @"(Max\s*)?pool\s*size\s*=\s*(\d+)";
+                Match m = Regex.Match(_connectionString, pattern, RegexOptions.IgnoreCase);
+                if (m.Success == false || int.TryParse(m.Groups[2].Value, out var poolsize) == false || poolsize <= 0) poolsize = 100;
+                var connStrIncr = dicConnStrIncr.AddOrUpdate(_connectionString, 1, (oldkey, oldval) => Math.Min(5, oldval + 1));
+                PoolSize = poolsize + connStrIncr;
+                _connectionString = m.Success ?
+                    Regex.Replace(_connectionString, pattern, $"poolsize={PoolSize}", RegexOptions.IgnoreCase) :
+                    $"{_connectionString};poolsize={PoolSize}"; //NotSupportedException
+                //if (m.Success) _connectionString = Regex.Replace(_connectionString, pattern, "", RegexOptions.IgnoreCase);
+
+                pattern = @"Connection\s*LifeTime\s*=\s*(\d+)";
+                m = Regex.Match(_connectionString, pattern, RegexOptions.IgnoreCase);
+                if (m.Success)
+                {
+                    IdleTimeout = TimeSpan.FromSeconds(int.Parse(m.Groups[1].Value));
+                    _connectionString = Regex.Replace(_connectionString, pattern, "", RegexOptions.IgnoreCase);
+                }
+
+                var minPoolSize = 0;
+                pattern = @"Min\s*pool\s*size\s*=\s*(\d+)";
+                m = Regex.Match(_connectionString, pattern, RegexOptions.IgnoreCase);
+                if (m.Success)
+                {
+                    minPoolSize = int.Parse(m.Groups[1].Value);
+                    _connectionString = Regex.Replace(_connectionString, pattern, "", RegexOptions.IgnoreCase);
+                }
+
+                FreeSql.Internal.CommonUtils.PrevReheatConnectionPool(_pool, minPoolSize);
+            }
+        }
+
+        public bool OnCheckAvailable(Object<DbConnection> obj)
+        {
+            if (obj.Value.State == ConnectionState.Closed) obj.Value.Open();
+            return obj.Value.Ping(true);
+        }
+
+        public DbConnection OnCreate()
+        {
+            var conn = new DmConnection(_connectionString);
+            return conn;
+        }
+
+        public void OnDestroy(DbConnection obj)
+        {
+            if (obj.State != ConnectionState.Closed) obj.Close();
+            obj.Dispose();
+        }
+
+        public void OnGet(Object<DbConnection> obj)
+        {
+
+            if (_pool.IsAvailable)
+            {
+                if (obj.Value == null)
+                {
+                    if (_pool.SetUnavailable(new Exception("连接字符串错误")) == true)
+                        throw new Exception($"【{this.Name}】连接字符串错误，请检查。");
+                    return;
+                }
+
+                if (obj.Value.State != ConnectionState.Open || DateTime.Now.Subtract(obj.LastReturnTime).TotalSeconds > 60 && obj.Value.Ping() == false)
+                {
+
+                    try
+                    {
+                        obj.Value.Open();
+                    }
+                    catch (Exception ex)
+                    {
+                        if (_pool.SetUnavailable(ex) == true)
+                            throw new Exception($"【{this.Name}】状态不可用，等待后台检查程序恢复方可使用。{ex.Message}");
+                    }
+                }
+            }
+        }
+
+#if net40
+#else
+        async public Task OnGetAsync(Object<DbConnection> obj)
+        {
+
+            if (_pool.IsAvailable)
+            {
+                if (obj.Value == null)
+                {
+                    if (_pool.SetUnavailable(new Exception("连接字符串错误")) == true)
+                        throw new Exception($"【{this.Name}】连接字符串错误，请检查。");
+                    return;
+                }
+
+                if (obj.Value.State != ConnectionState.Open || DateTime.Now.Subtract(obj.LastReturnTime).TotalSeconds > 60 && (await obj.Value.PingAsync()) == false)
+                {
+
+                    try
+                    {
+                        await obj.Value.OpenAsync();
+                    }
+                    catch (Exception ex)
+                    {
+                        if (_pool.SetUnavailable(ex) == true)
+                            throw new Exception($"【{this.Name}】状态不可用，等待后台检查程序恢复方可使用。{ex.Message}");
+                    }
+                }
+            }
+        }
+#endif
+
+        public void OnGetTimeout()
+        {
+
+        }
+
+        public void OnReturn(Object<DbConnection> obj)
+        {
+            //if (obj?.Value != null && obj.Value.State != ConnectionState.Closed) try { obj.Value.Close(); } catch { }
+        }
+
+        public void OnAvailable()
+        {
+            _pool.availableHandler?.Invoke();
+        }
+
+        public void OnUnavailable()
+        {
+            _pool.unavailableHandler?.Invoke();
+        }
+    }
+
+    static class DbConnectionExtensions
+    {
+
+        static DbCommand PingCommand(DbConnection conn)
+        {
+            var cmd = conn.CreateCommand();
+            cmd.CommandTimeout = 5;
+            cmd.CommandText = "select 1 from dual";
+            return cmd;
+        }
+        public static bool Ping(this DbConnection that, bool isThrow = false)
+        {
+            try
+            {
+                PingCommand(that).ExecuteNonQuery();
+                return true;
+            }
+            catch
+            {
+                if (that.State != ConnectionState.Closed) try { that.Close(); } catch { }
+                if (isThrow) throw;
+                return false;
+            }
+        }
+
+#if net40
+#else
+        async public static Task<bool> PingAsync(this DbConnection that, bool isThrow = false)
+        {
+            try
+            {
+                await PingCommand(that).ExecuteNonQueryAsync();
+                return true;
+            }
+            catch
+            {
+                if (that.State != ConnectionState.Closed) try { that.Close(); } catch { }
+                if (isThrow) throw;
+                return false;
+            }
+        }
+#endif
+    }
+}

Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs

@@ -0,0 +1,469 @@
+using Dm;
+using FreeSql.DataAnnotations;
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace FreeSql.Dameng
+{
+
+    class DamengCodeFirst : Internal.CommonProvider.CodeFirstProvider
+    {
+        public override bool IsNoneCommandParameter { get => true; set => base.IsNoneCommandParameter = true; }
+        public DamengCodeFirst(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression) : base(orm, commonUtils, commonExpression) { }
+
+        static object _dicCsToDbLock = new object();
+        static Dictionary<string, CsToDb<DmDbType>> _dicCsToDb = new Dictionary<string, CsToDb<DmDbType>>() {
+                { typeof(bool).FullName, CsToDb.New(DmDbType.Bit, "number","number(1) NOT NULL", null, false, false) },{ typeof(bool?).FullName, CsToDb.New(DmDbType.Bit, "number","number(1) NULL", null, true, null) },
+
+                { typeof(sbyte).FullName, CsToDb.New(DmDbType.SByte, "number", "number(4) NOT NULL", false, false, 0) },{ typeof(sbyte?).FullName, CsToDb.New(DmDbType.SByte, "number", "number(4) NULL", false, true, null) },
+                { typeof(short).FullName, CsToDb.New(DmDbType.Int16, "number","number(6) NOT NULL", false, false, 0) },{ typeof(short?).FullName, CsToDb.New(DmDbType.Int16, "number", "number(6) NULL", false, true, null) },
+                { typeof(int).FullName, CsToDb.New(DmDbType.Int32, "number", "number(11) NOT NULL", false, false, 0) },{ typeof(int?).FullName, CsToDb.New(DmDbType.Int32, "number", "number(11) NULL", false, true, null) },
+                { typeof(long).FullName, CsToDb.New(DmDbType.Int64, "number","number(21) NOT NULL", false, false, 0) },{ typeof(long?).FullName, CsToDb.New(DmDbType.Int64, "number","number(21) NULL", false, true, null) },
+
+                { typeof(byte).FullName, CsToDb.New(DmDbType.Byte, "number","number(3) NOT NULL", true, false, 0) },{ typeof(byte?).FullName, CsToDb.New(DmDbType.Byte, "number","number(3) NULL", true, true, null) },
+                { typeof(ushort).FullName, CsToDb.New(DmDbType.UInt16, "number","number(5) NOT NULL", true, false, 0) },{ typeof(ushort?).FullName, CsToDb.New(DmDbType.UInt16, "number", "number(5) NULL", true, true, null) },
+                { typeof(uint).FullName, CsToDb.New(DmDbType.UInt32, "number", "number(10) NOT NULL", true, false, 0) },{ typeof(uint?).FullName, CsToDb.New(DmDbType.UInt32, "number", "number(10) NULL", true, true, null) },
+                { typeof(ulong).FullName, CsToDb.New(DmDbType.UInt64, "number", "number(20) NOT NULL", true, false, 0) },{ typeof(ulong?).FullName, CsToDb.New(DmDbType.UInt64, "number", "number(20) NULL", true, true, null) },
+
+                { typeof(double).FullName, CsToDb.New(DmDbType.Double, "double", "double NOT NULL", false, false, 0) },{ typeof(double?).FullName, CsToDb.New(DmDbType.Double, "double", "double NULL", false, true, null) },
+                { typeof(float).FullName, CsToDb.New(DmDbType.Float, "real","real NOT NULL", false, false, 0) },{ typeof(float?).FullName, CsToDb.New(DmDbType.Float, "real","real NULL", false, true, null) },
+                { typeof(decimal).FullName, CsToDb.New(DmDbType.Decimal, "number", "number(10,2) NOT NULL", false, false, 0) },{ typeof(decimal?).FullName, CsToDb.New(DmDbType.Decimal, "number", "number(10,2) NULL", false, true, null) },
+
+                //达梦8 ODBC 不支持 TimeSpan
+                //{ typeof(TimeSpan).FullName, CsToDb.NewInfo(DmDbType.Time, "interval day to second","interval day(2) to second(6) NOT NULL", false, false, 0) },{ typeof(TimeSpan?).FullName,  (DmDbType.Time, "interval day to second", "interval day(2) to second(6) NULL",false, true, null) },
+                { typeof(DateTime).FullName, CsToDb.New(DmDbType.DateTime, "timestamp", "timestamp(6) NOT NULL", false, false, new DateTime(1970,1,1)) },{ typeof(DateTime?).FullName, CsToDb.New(DmDbType.DateTime, "timestamp", "timestamp(6) NULL", false, true, null) },
+                { typeof(DateTimeOffset).FullName, CsToDb.New(DmDbType.DateTime, "timestamp", "timestamp(6) NOT NULL", false, false, new DateTime(1970,1,1)) },{ typeof(DateTimeOffset?).FullName, CsToDb.New(DmDbType.DateTime, "timestamp", "timestamp(6) NULL", false, true, null) },
+
+                { typeof(byte[]).FullName, CsToDb.New(DmDbType.VarBinary, "blob", "blob NULL", false, null, new byte[0]) },
+                { typeof(string).FullName, CsToDb.New(DmDbType.VarChar, "nvarchar2", "nvarchar2(255) NULL", false, null, "") },
+
+                { typeof(Guid).FullName, CsToDb.New(DmDbType.Char, "char", "char(36) NOT NULL", false, false, Guid.Empty) },{ typeof(Guid?).FullName, CsToDb.New(DmDbType.Char, "char", "char(36) NULL", false, true, null) },
+            };
+
+        public override DbInfoResult GetDbInfo(Type type)
+        {
+            if (_dicCsToDb.TryGetValue(type.FullName, out var trydc)) return new DbInfoResult((int)trydc.type, trydc.dbtype, trydc.dbtypeFull, trydc.isnullable, trydc.defaultValue);
+            if (type.IsArray) return null;
+            var enumType = type.IsEnum ? type : null;
+            if (enumType == null && type.IsNullableType())
+            {
+                var genericTypes = type.GetGenericArguments();
+                if (genericTypes.Length == 1 && genericTypes.First().IsEnum) enumType = genericTypes.First();
+            }
+            if (enumType != null)
+            {
+                var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
+                    CsToDb.New(DmDbType.Int32, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
+                    CsToDb.New(DmDbType.Int64, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                if (_dicCsToDb.ContainsKey(type.FullName) == false)
+                {
+                    lock (_dicCsToDbLock)
+                    {
+                        if (_dicCsToDb.ContainsKey(type.FullName) == false)
+                            _dicCsToDb.Add(type.FullName, newItem);
+                    }
+                }
+                return new DbInfoResult((int)newItem.type, newItem.dbtype, newItem.dbtypeFull, newItem.isnullable, newItem.defaultValue);
+            }
+            return null;
+        }
+
+        protected override string GetComparisonDDLStatements(params TypeAndName[] objects)
+        {
+            var userId = (_orm.Ado.MasterPool as DamengConnectionPool)?.UserId;
+            if (string.IsNullOrEmpty(userId))
+                using (var conn = _orm.Ado.MasterPool.Get())
+                {
+                    userId = DamengConnectionPool.GetUserId(conn.Value.ConnectionString);
+                }
+            var seqcols = new List<NaviteTuple<ColumnInfo, string[], bool>>(); //序列：列，表，自增
+            var seqnameDel = new List<string>(); //要删除的序列+触发器
+
+            var sb = new StringBuilder();
+            var sbDeclare = new StringBuilder();
+            foreach (var obj in objects)
+            {
+                if (sb.Length > 0) sb.Append("\r\n");
+                var tb = _commonUtils.GetTableByEntity(obj.entityType);
+                if (tb == null) throw new Exception($"类型 {obj.entityType.FullName} 不可迁移");
+                if (tb.Columns.Any() == false) throw new Exception($"类型 {obj.entityType.FullName} 不可迁移，可迁移属性0个");
+                var tbname = _commonUtils.SplitTableName(tb.DbName);
+                if (tbname?.Length == 1) tbname = new[] { userId, tbname[0] };
+
+                var tboldname = _commonUtils.SplitTableName(tb.DbOldName); //旧表名
+                if (tboldname?.Length == 1) tboldname = new[] { userId, tboldname[0] };
+                var primaryKeyName = (obj.entityType.GetCustomAttributes(typeof(OraclePrimaryKeyNameAttribute), false)?.FirstOrDefault() as OraclePrimaryKeyNameAttribute)?.Name;
+                if (string.IsNullOrEmpty(obj.tableName) == false)
+                {
+                    var tbtmpname = _commonUtils.SplitTableName(obj.tableName);
+                    if (tbtmpname?.Length == 1) tbtmpname = new[] { userId, tbtmpname[0] };
+                    if (tbname[0] != tbtmpname[0] || tbname[1] != tbtmpname[1])
+                    {
+                        tbname = tbtmpname;
+                        tboldname = null;
+                        primaryKeyName = null;
+                    }
+                }
+                //codefirst 不支持表名中带 .
+
+                if (string.Compare(tbname[0], userId) != 0 && _orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(" select 1 from sys.dba_users where username={0}", tbname[0])) == null) //创建数据库
+                    throw new NotImplementedException($"达梦 CodeFirst 不支持代码创建 tablespace 与 schemas {tbname[0]}");
+
+                var sbalter = new StringBuilder();
+                var istmpatler = false; //创建临时表，导入数据，删除旧表，修改
+                if (_orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(" select 1 from all_tab_comments where owner={0} and table_name={1}", tbname)) == null)
+                { //表不存在
+                    if (tboldname != null)
+                    {
+                        if (_orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(" select 1 from all_tab_comments where owner={0} and table_name={1}", tboldname)) == null)
+                            //模式或表不存在
+                            tboldname = null;
+                    }
+                    if (tboldname == null)
+                    {
+                        //创建表
+                        var createTableName = _commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}");
+                        sb.Append("execute immediate 'CREATE TABLE ").Append(createTableName).Append(" ( ");
+                        foreach (var tbcol in tb.ColumnsByPosition)
+                        {
+                            sb.Append(" \r\n  ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" ").Append(tbcol.Attribute.DbType).Append(",");
+                            if (tbcol.Attribute.IsIdentity == true) seqcols.Add(NaviteTuple.Create(tbcol, tbname, true));
+                        }
+                        if (tb.Primarys.Any())
+                        {
+                            var pkname = primaryKeyName ?? $"{tbname[0]}_{tbname[1]}_pk1";
+                            sb.Append(" \r\n  CONSTRAINT ").Append(_commonUtils.QuoteSqlName(pkname)).Append(" PRIMARY KEY (");
+                            foreach (var tbcol in tb.Primarys) sb.Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(", ");
+                            sb.Remove(sb.Length - 2, 2).Append("),");
+                        }
+                        sb.Remove(sb.Length - 1, 1);
+                        sb.Append("\r\n) LOGGING ';\r\n");
+                        //创建表的索引
+                        foreach (var uk in tb.Indexes)
+                        {
+                            sb.Append("execute immediate 'CREATE ");
+                            if (uk.IsUnique) sb.Append("UNIQUE ");
+                            sb.Append("INDEX ").Append(_commonUtils.QuoteSqlName(uk.Name)).Append(" ON ").Append(createTableName).Append("(");
+                            foreach (var tbcol in uk.Columns)
+                            {
+                                sb.Append(_commonUtils.QuoteSqlName(tbcol.Column.Attribute.Name));
+                                if (tbcol.IsDesc) sb.Append(" DESC");
+                                sb.Append(", ");
+                            }
+                            sb.Remove(sb.Length - 2, 2).Append(")';\r\n");
+                        }
+                        //备注
+                        foreach (var tbcol in tb.ColumnsByPosition)
+                        {
+                            if (string.IsNullOrEmpty(tbcol.Comment) == false)
+                                sb.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment).Replace("'", "''")).Append("';\r\n");
+                        }
+                        if (string.IsNullOrEmpty(tb.Comment) == false)
+                            sb.Append("execute immediate 'COMMENT ON TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tb.Comment).Replace("'", "''")).Append("';\r\n");
+                        continue;
+                    }
+                    //如果新表，旧表在一个模式下，直接修改表名
+                    if (string.Compare(tbname[0], tboldname[0], true) == 0)
+                        sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tboldname[0]}.{tboldname[1]}")).Append(" RENAME TO ").Append(_commonUtils.QuoteSqlName($"{tbname[1]}")).Append("';\r\n");
+                    else
+                    {
+                        //如果新表，旧表不在一起，创建新表，导入数据，删除旧表
+                        istmpatler = true;
+                    }
+                }
+                else
+                    tboldname = null; //如果新表已经存在，不走改表名逻辑
+
+                //对比字段，只可以修改类型、增加字段、有限的修改字段名；保证安全不删除字段
+                var sql = _commonUtils.FormatSql($@"
+select 
+a.column_name,
+a.data_type,
+a.data_length,
+a.data_precision,
+a.data_scale,
+a.char_used,
+case when a.nullable = 'N' then 0 else 1 end,
+nvl((select 1 from user_sequences where upper(sequence_name)=upper('{Utils.GetCsName((tboldname ?? tbname).Last())}_seq_'||a.column_name) and rownum < 2), 0),
+nvl((select 1 from user_triggers where upper(trigger_name)=upper('{Utils.GetCsName((tboldname ?? tbname).Last())}_seq_'||a.column_name||'TI') and rownum < 2), 0),
+b.comments
+from all_tab_columns a
+left join all_col_comments b on b.owner = a.owner and b.table_name = a.table_name and b.column_name = a.column_name
+where a.owner={{0}} and a.table_name={{1}}", tboldname ?? tbname);
+                var ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
+                var tbstruct = ds.ToDictionary(a => string.Concat(a[0]), a =>
+                {
+                    var sqlType = GetDamengSqlTypeFullName(a);
+                    return new
+                    {
+                        column = string.Concat(a[0]),
+                        sqlType,
+                        is_nullable = string.Concat(a[6]) == "1",
+                        is_identity = string.Concat(a[7]) == "1" && string.Concat(a[8]) == "1",
+                        comment = string.Concat(a[9])
+                    };
+                }, StringComparer.CurrentCultureIgnoreCase);
+
+                if (istmpatler == false)
+                {
+                    foreach (var tbcol in tb.ColumnsByPosition)
+                    {
+                        var dbtypeNoneNotNull = Regex.Replace(tbcol.Attribute.DbType, @"NOT\s+NULL", "NULL");
+                        if (tbstruct.TryGetValue(tbcol.Attribute.Name, out var tbstructcol) ||
+                            string.IsNullOrEmpty(tbcol.Attribute.OldName) == false && tbstruct.TryGetValue(tbcol.Attribute.OldName, out tbstructcol))
+                        {
+                            var isCommentChanged = tbstructcol.comment != (tbcol.Comment ?? "");
+                            if (tbcol.Attribute.DbType.StartsWith(tbstructcol.sqlType, StringComparison.CurrentCultureIgnoreCase) == false)
+                            {
+                                istmpatler = true;
+                                if (istmpatler && tbcol.Attribute.DbType.StartsWith("varchar", StringComparison.CurrentCultureIgnoreCase) && tbstructcol.sqlType.StartsWith("varchar2", StringComparison.CurrentCultureIgnoreCase)
+                                    && Regex.Match(tbcol.Attribute.DbType, @"\(\d+").Groups[0].Value == Regex.Match(tbstructcol.sqlType, @"\(\d+").Groups[0].Value)
+                                    istmpatler = false;
+                                if (istmpatler && Regex.IsMatch(tbcol.Attribute.DbType, @"\(\d+") == false && Regex.IsMatch(tbstructcol.sqlType, @"\(\d+")
+                                    && string.Compare(tbcol.Attribute.DbType, Regex.Replace(tbstructcol.sqlType, @"\([^\)]+\)", ""), StringComparison.CurrentCultureIgnoreCase) == 0)
+                                    istmpatler = false;
+                            }
+                            //sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" MODIFY (").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" ").Append(dbtypeNoneNotNull).Append(")';\r\n");
+                            if (tbcol.Attribute.IsNullable != tbstructcol.is_nullable)
+                            {
+                                if (tbcol.Attribute.IsNullable == false)
+                                    sbalter.Append("execute immediate 'UPDATE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" SET ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" = ").Append(tbcol.DbDefaultValue.Replace("'", "''")).Append(" WHERE ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" IS NULL';\r\n");
+                                sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" MODIFY ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" ").Append(tbcol.Attribute.IsNullable == true ? "" : "NOT").Append(" NULL';\r\n");
+                            }
+                            if (string.Compare(tbstructcol.column, tbcol.Attribute.OldName, true) == 0)
+                            {
+                                if (tbstructcol.is_identity)
+                                    seqnameDel.Add(Utils.GetCsName($"{tbname[1]}_seq_{tbstructcol.column}"));
+                                //修改列名
+                                sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" RENAME COLUMN ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" TO ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append("';\r\n");
+                                if (tbcol.Attribute.IsIdentity)
+                                    seqcols.Add(NaviteTuple.Create(tbcol, tbname, tbcol.Attribute.IsIdentity == true));
+                            }
+                            else if (tbcol.Attribute.IsIdentity != tbstructcol.is_identity)
+                                seqcols.Add(NaviteTuple.Create(tbcol, tbname, tbcol.Attribute.IsIdentity == true));
+                            if (isCommentChanged)
+                                sbalter.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment ?? "").Replace("'", "''")).Append("';\r\n");
+                            continue;
+                        }
+                        //添加列
+                        sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" ADD (").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" ").Append(dbtypeNoneNotNull).Append(")';\r\n");
+                        if (tbcol.Attribute.IsNullable == false)
+                        {
+                            sbalter.Append("execute immediate 'UPDATE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" SET ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" = ").Append(tbcol.DbDefaultValue.Replace("'", "''")).Append("';\r\n");
+                            sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" MODIFY ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" NOT NULL';\r\n");
+                        }
+                        if (tbcol.Attribute.IsIdentity == true) seqcols.Add(NaviteTuple.Create(tbcol, tbname, tbcol.Attribute.IsIdentity == true));
+                        if (string.IsNullOrEmpty(tbcol.Comment) == false) sbalter.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment ?? "").Replace("'", "''")).Append("';\r\n");
+                    }
+
+                    var dsuksql = _commonUtils.FormatSql(@"
+select
+c.column_name,
+a.index_name,
+case when c.descend = 'DESC' then 1 else 0 end,
+case when a.uniqueness = 'UNIQUE' then 1 else 0 end
+from all_indexes a,
+all_ind_columns c 
+where a.index_name = c.index_name
+and a.table_owner = c.table_owner
+and a.table_name = c.table_name
+and a.owner in ({0}) and a.table_name in ({1})
+and not exists(select 1 from all_constraints where index_name = a.index_name and constraint_type = 'P')", tboldname ?? tbname);
+                    var dsuk = _orm.Ado.ExecuteArray(CommandType.Text, dsuksql).Select(a => new[] { string.Concat(a[0]).Trim('"'), string.Concat(a[1]), string.Concat(a[2]), string.Concat(a[3]) }).ToArray();
+                    foreach (var uk in tb.Indexes)
+                    {
+                        if (string.IsNullOrEmpty(uk.Name) || uk.Columns.Any() == false) continue;
+                        var dsukfind1 = dsuk.Where(a => string.Compare(a[1], uk.Name, true) == 0).ToArray();
+                        if (dsukfind1.Any() == false || dsukfind1.Length != uk.Columns.Length || dsukfind1.Where(a => uk.Columns.Where(b => (a[3] == "1") == uk.IsUnique && string.Compare(b.Column.Attribute.Name, a[0], true) == 0 && (a[2] == "1") == b.IsDesc).Any()).Count() != uk.Columns.Length)
+                        {
+                            if (dsukfind1.Any()) sbalter.Append("execute immediate 'DROP INDEX ").Append(_commonUtils.QuoteSqlName(uk.Name)).Append("';\r\n");
+                            sbalter.Append("execute immediate 'CREATE ");
+                            if (uk.IsUnique) sbalter.Append("UNIQUE ");
+                            sbalter.Append("INDEX ").Append(_commonUtils.QuoteSqlName(uk.Name)).Append(" ON ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append("(");
+                            foreach (var tbcol in uk.Columns)
+                            {
+                                sbalter.Append(_commonUtils.QuoteSqlName(tbcol.Column.Attribute.Name));
+                                if (tbcol.IsDesc) sbalter.Append(" DESC");
+                                sbalter.Append(", ");
+                            }
+                            sbalter.Remove(sbalter.Length - 2, 2).Append(")';\r\n");
+                        }
+                    }
+                }
+                if (istmpatler == false)
+                {
+                    var dbcomment = string.Concat(_orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(@" select comments from all_tab_comments where owner = {0} and table_name = {1} and table_type = 'TABLE'", tbname[0], tbname[1])));
+                    if (dbcomment != (tb.Comment ?? ""))
+                        sb.Append("execute immediate 'COMMENT ON TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tb.Comment).Replace("'", "''")).Append("';\r\n");
+
+                    sb.Append(sbalter);
+                    continue;
+                }
+                var oldpk = _orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(@" select constraint_name from user_constraints where owner={0} and table_name={1} and constraint_type='P'", tbname))?.ToString();
+                if (string.IsNullOrEmpty(oldpk) == false)
+                    sb.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" DROP CONSTRAINT ").Append(oldpk).Append("';\r\n");
+
+                //创建临时表，数据导进临时表，然后删除原表，将临时表改名为原表名
+                var tablename = tboldname == null ? _commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}") : _commonUtils.QuoteSqlName($"{tboldname[0]}.{tboldname[1]}");
+                var tmptablename = _commonUtils.QuoteSqlName($"{tbname[0]}.FTmp_{tbname[1]}");
+                //创建临时表
+                sb.Append("execute immediate 'CREATE TABLE ").Append(tmptablename).Append(" ( ");
+                foreach (var tbcol in tb.ColumnsByPosition)
+                {
+                    sb.Append(" \r\n  ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" ").Append(tbcol.Attribute.DbType).Append(",");
+                    if (tbcol.Attribute.IsIdentity == true) seqcols.Add(NaviteTuple.Create(tbcol, tbname, true));
+                }
+                if (tb.Primarys.Any())
+                {
+                    var pkname = primaryKeyName ?? $"{tbname[0]}_{tbname[1]}_pk2";
+                    sb.Append(" \r\n  CONSTRAINT ").Append(_commonUtils.QuoteSqlName(pkname)).Append(" PRIMARY KEY (");
+                    foreach (var tbcol in tb.Primarys) sb.Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(", ");
+                    sb.Remove(sb.Length - 2, 2).Append("),");
+                }
+                sb.Remove(sb.Length - 1, 1);
+                sb.Append("\r\n) LOGGING ';\r\n");
+                //备注
+                foreach (var tbcol in tb.ColumnsByPosition)
+                {
+                    if (string.IsNullOrEmpty(tbcol.Comment) == false)
+                        sb.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.FTmp_{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment).Replace("'", "''")).Append("';\r\n");
+                }
+                if (string.IsNullOrEmpty(tb.Comment) == false)
+                    sb.Append("execute immediate 'COMMENT ON TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.FTmp_{tbname[1]}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tb.Comment).Replace("'", "''")).Append("';\r\n");
+
+                sb.Append("execute immediate 'INSERT INTO ").Append(tmptablename).Append(" (");
+                foreach (var tbcol in tb.ColumnsByPosition)
+                    sb.Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(", ");
+                sb.Remove(sb.Length - 2, 2).Append(")\r\nSELECT ");
+                foreach (var tbcol in tb.ColumnsByPosition)
+                {
+                    var insertvalue = "NULL";
+                    if (tbstruct.TryGetValue(tbcol.Attribute.Name, out var tbstructcol) ||
+                        string.IsNullOrEmpty(tbcol.Attribute.OldName) == false && tbstruct.TryGetValue(tbcol.Attribute.OldName, out tbstructcol))
+                    {
+                        insertvalue = _commonUtils.QuoteSqlName(tbstructcol.column);
+                        if (tbcol.Attribute.DbType.StartsWith(tbstructcol.sqlType, StringComparison.CurrentCultureIgnoreCase) == false)
+                        {
+                            var dbtypeNoneNotNull = Regex.Replace(tbcol.Attribute.DbType, @"(NOT\s+)?NULL", "");
+                            insertvalue = $"cast({insertvalue} as {dbtypeNoneNotNull})";
+                        }
+                        if (tbcol.Attribute.IsNullable != tbstructcol.is_nullable)
+                            insertvalue = $"nvl({insertvalue},{tbcol.DbDefaultValue})";
+                    }
+                    else if (tbcol.Attribute.IsNullable == false)
+                        insertvalue = tbcol.DbDefaultValue;
+                    sb.Append(insertvalue.Replace("'", "''")).Append(", ");
+                }
+                sb.Remove(sb.Length - 2, 2).Append(" FROM ").Append(tablename).Append("';\r\n");
+                sb.Append("execute immediate 'DROP TABLE ").Append(tablename).Append("';\r\n");
+                sb.Append("execute immediate 'ALTER TABLE ").Append(tmptablename).Append(" RENAME TO ").Append(_commonUtils.QuoteSqlName($"{tbname[1]}")).Append("';\r\n");
+                //创建表的索引
+                foreach (var uk in tb.Indexes)
+                {
+                    sb.Append("execute immediate 'CREATE ");
+                    if (uk.IsUnique) sb.Append("UNIQUE ");
+                    sb.Append("INDEX ").Append(_commonUtils.QuoteSqlName(uk.Name)).Append(" ON ").Append(tablename).Append("(");
+                    foreach (var tbcol in uk.Columns)
+                    {
+                        sb.Append(_commonUtils.QuoteSqlName(tbcol.Column.Attribute.Name));
+                        if (tbcol.IsDesc) sb.Append(" DESC");
+                        sb.Append(", ");
+                    }
+                    sb.Remove(sb.Length - 2, 2).Append(")';\r\n");
+                }
+            }
+            Dictionary<string, bool> dicDeclare = new Dictionary<string, bool>();
+            Action<string> dropSequence = seqname =>
+            {
+                if (dicDeclare.ContainsKey(seqname) == false)
+                {
+                    sbDeclare.Append("\r\nIS").Append(seqname).Append(" NUMBER; \r\n");
+                    dicDeclare.Add(seqname, true);
+                }
+                sb.Append("IS").Append(seqname).Append(" := 0; \r\n")
+                    .Append(" select count(1) into IS").Append(seqname).Append(_commonUtils.FormatSql(" from user_sequences where sequence_name={0}; \r\n", seqname))
+                    .Append("if IS").Append(seqname).Append(" > 0 then \r\n")
+                    .Append("  execute immediate 'DROP SEQUENCE ").Append(_commonUtils.QuoteSqlName(seqname)).Append("';\r\n")
+                    .Append("end if; \r\n");
+            };
+            Action<string> dropTrigger = tiggerName =>
+            {
+                if (dicDeclare.ContainsKey(tiggerName) == false)
+                {
+                    sbDeclare.Append("\r\nIS").Append(tiggerName).Append(" NUMBER; \r\n");
+                    dicDeclare.Add(tiggerName, true);
+                }
+                sb.Append("IS").Append(tiggerName).Append(" := 0; \r\n")
+                    .Append(" select count(1) into IS").Append(tiggerName).Append(_commonUtils.FormatSql(" from user_triggers where trigger_name={0}; \r\n", tiggerName))
+                    .Append("if IS").Append(tiggerName).Append(" > 0 then \r\n")
+                    .Append("  execute immediate 'DROP TRIGGER ").Append(_commonUtils.QuoteSqlName(tiggerName)).Append("';\r\n")
+                    .Append("end if; \r\n");
+            };
+            foreach (var seqname in seqnameDel)
+            {
+                dropSequence(seqname);
+                dropTrigger(seqname + "TI");
+            }
+            foreach (var seqcol in seqcols)
+            {
+                var tbname = seqcol.Item2;
+                var seqname = Utils.GetCsName($"{tbname[1]}_seq_{seqcol.Item1.Attribute.Name}").ToUpper();
+                var tiggerName = seqname + "TI";
+                var tbname2 = _commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}");
+                var colname2 = _commonUtils.QuoteSqlName(seqcol.Item1.Attribute.Name);
+                dropSequence(seqname);
+                if (seqcol.Item3)
+                {
+                    var startWith = _orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(" select 1 from all_tab_columns where owner={0} and table_name={1} and column_name={2}", tbname[0], tbname[1], seqcol.Item1.Attribute.Name)) == null ? 1 :
+                        _orm.Ado.ExecuteScalar(CommandType.Text, $" select nvl(max({colname2})+1,1) from {tbname2}");
+                    sb.Append("execute immediate 'CREATE SEQUENCE ").Append(_commonUtils.QuoteSqlName(seqname)).Append(" start with ").Append(startWith).Append("';\r\n");
+                    sb.Append("execute immediate 'CREATE OR REPLACE TRIGGER ").Append(_commonUtils.QuoteSqlName(tiggerName))
+                        .Append(" \r\nbefore insert on ").Append(tbname2)
+                        .Append(" \r\nfor each row \r\nbegin\r\nselect ").Append(_commonUtils.QuoteSqlName(seqname))
+                        .Append(".nextval into :new.").Append(colname2).Append(" from dual;\r\nend;';\r\n");
+                }
+                else
+                    dropTrigger(tiggerName);
+            }
+            if (sbDeclare.Length > 0) sbDeclare.Insert(0, "declare ");
+            return sb.Length == 0 ? null : sb.Insert(0, "BEGIN \r\n").Insert(0, sbDeclare.ToString()).Append("END;").ToString();
+        }
+
+        internal static string GetDamengSqlTypeFullName(object[] row)
+        {
+            var a = row;
+            var sqlType = string.Concat(a[1]).ToUpper();
+            var data_length = long.Parse(string.Concat(a[2]));
+            long.TryParse(string.Concat(a[3]), out var data_precision);
+            long.TryParse(string.Concat(a[4]), out var data_scale);
+            //var char_used = string.Concat(a[5]);
+            if (sqlType.StartsWith("INTERVAL DAY TO SECOND"))
+                sqlType = $"INTERVAL DAY({(data_scale - 1536) / 16}) TO SECOND({(data_scale - 1536) % 16})";
+            else if (Regex.IsMatch(sqlType, @"INTERVAL YEAR\(\d+\) TO MONTH", RegexOptions.IgnoreCase))
+            {
+            }
+            else if (sqlType.StartsWith("TIMESTAMP", StringComparison.CurrentCultureIgnoreCase))
+                sqlType += data_scale <= 0 ? "" : $"({data_scale})";
+            else if (sqlType.StartsWith("BLOB"))
+            {
+            }
+            else if (sqlType == "REAL" || sqlType == "DOUBLE" || sqlType == "FLOAT")
+            { 
+            }
+            else if (data_precision > 0 && data_scale > 0)
+                sqlType += $"({data_precision},{data_scale})";
+            else if (data_precision > 0)
+                sqlType += $"({data_precision})";
+            else
+                sqlType += $"({data_length})";
+            return sqlType;
+        }
+    }
+}

Providers/FreeSql.Provider.Dameng/DamengDbFirst.cs

@@ -0,0 +1,559 @@
+using Dm;
+using FreeSql.DatabaseModel;
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace FreeSql.Dameng
+{
+    class DamengDbFirst : IDbFirst
+    {
+        IFreeSql _orm;
+        protected CommonUtils _commonUtils;
+        protected CommonExpression _commonExpression;
+        public DamengDbFirst(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression)
+        {
+            _orm = orm;
+            _commonUtils = commonUtils;
+            _commonExpression = commonExpression;
+        }
+
+        public int GetDbType(DbColumnInfo column) => (int)GetSqlDbType(column);
+        DmDbType GetSqlDbType(DbColumnInfo column)
+        {
+            var dbfull = column.DbTypeTextFull.ToLower();
+            switch (dbfull)
+            {
+                case "number(1)": return DmDbType.Bit;
+
+                case "number(4)": return DmDbType.SByte;
+                case "number(6)": return DmDbType.Int16;
+                case "number(11)": return DmDbType.Int32;
+                case "number(21)": return DmDbType.Int64;
+
+                case "number(3)": return DmDbType.Byte;
+                case "number(5)": return DmDbType.UInt16;
+                case "number(10)": return DmDbType.UInt32;
+                case "number(20)": return DmDbType.UInt64;
+
+                case "float(126)": return DmDbType.Double;
+                case "float(63)": return DmDbType.Float;
+                case "number(10,2)": return DmDbType.Decimal;
+
+                case "interval day(2) to second(6)": return DmDbType.Time;
+                case "timestamp(6)": return DmDbType.DateTime;
+                case "timestamp(6) with local time zone": return DmDbType.DateTime;
+
+                case "blob": return DmDbType.VarBinary;
+                case "nvarchar2(255)": return DmDbType.VarChar;
+
+                case "char(36)": return DmDbType.Char;
+            }
+            switch (column.DbTypeText.ToLower())
+            {
+                case "bit":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(1)"]);
+                    return DmDbType.Bit;
+                case "smallint":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(4)"]);
+                    return DmDbType.UInt16;
+                case "byte":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(3)"]);
+                    return DmDbType.Byte;
+                case "tinyint":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(3)"]);
+                    return DmDbType.Byte;
+                case "integer":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(11)"]);
+                    return DmDbType.Int32;
+                case "bigint":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(21)"]);
+                    return DmDbType.Int64;
+                case "dec":
+                case "decimal":
+                case "numeric":
+                case "number":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(10,2)"]);
+                    return DmDbType.Decimal;
+                case "time":
+                case "interval day to second":
+                case "interval year to month":
+                case "interval year":
+                case "interval month":
+                case "interval day":
+                case "interval day to hour":
+                case "interval day to minute":
+                case "interval hour":
+                case "interval hour to minute":
+                case "interval hour to second":
+                case "interval minute":
+                case "interval minute to second":
+                case "interval second":
+                case "time with time zone":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["interval day(2) to second(6)"]);
+                    return DmDbType.Time;
+                case "date":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["date(7)"]);
+                    return DmDbType.DateTime;
+                case "timestamp":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["timestamp(6)"]);
+                    return DmDbType.DateTime;
+                case "timestamp with local time zone":
+                case "timestamp with time zone":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["timestamp(6) with local time zone"]);
+                    return DmDbType.DateTime;
+                case "binary":
+                case "varbinary":
+                case "blob":
+                case "image":
+                case "longvarbinary":
+                case "bfile":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["blob"]);
+                    return DmDbType.VarBinary;
+                case "nvarchar2":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["nvarchar2(255)"]);
+                    return DmDbType.VarChar;
+                case "varchar":
+                case "varchar2":
+                case "text":
+                case "longvarchar":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["nvarchar2(255)"]);
+                    return DmDbType.VarChar;
+                case "character":
+                case "char":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["nvarchar2(255)"]);
+                    return DmDbType.Char;
+                case "nchar":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["nvarchar2(255)"]);
+                    return DmDbType.Char;
+                case "clob":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["nvarchar2(255)"]);
+                    return DmDbType.VarChar;
+                case "nclob":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["nvarchar2(255)"]);
+                    return DmDbType.VarChar;
+                case "raw":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["blob"]);
+                    return DmDbType.VarBinary;
+                case "long raw":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["blob"]);
+                    return DmDbType.VarBinary;
+                case "real":
+                case "binary_float":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["float(63)"]);
+                    return DmDbType.Float;
+                case "double":
+                case "float":
+                case "double precision":
+                case "binary_double":
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["float(126)"]);
+                    return DmDbType.Double;
+                case "rowid":
+                default:
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["nvarchar2(255)"]);
+                    return DmDbType.VarChar;
+            }
+            throw new NotImplementedException($"未实现 {column.DbTypeTextFull} 类型映射");
+        }
+
+        static ConcurrentDictionary<string, DbToCs> _dicDbToCs = new ConcurrentDictionary<string, DbToCs>(StringComparer.CurrentCultureIgnoreCase);
+        static DamengDbFirst()
+        {
+            var defaultDbToCs = new Dictionary<string, DbToCs>() {
+                { "number(1)", new DbToCs("(bool?)", "{0} == \"1\"", "{0} == true ? \"1\" : \"0\"", "bool?", typeof(bool), typeof(bool?), "{0}.Value", "GetBoolean") },
+
+                { "number(4)", new DbToCs("(sbyte?)", "sbyte.Parse({0})", "{0}.ToString()", "sbyte?", typeof(sbyte), typeof(sbyte?), "{0}.Value", "GetInt16") },
+                { "number(6)", new DbToCs("(short?)", "short.Parse({0})", "{0}.ToString()", "short?", typeof(short), typeof(short?), "{0}.Value", "GetInt16") },
+                { "number(11)", new DbToCs("(int?)", "int.Parse({0})", "{0}.ToString()", "int?", typeof(int), typeof(int?), "{0}.Value", "GetInt32") },
+                { "number(21)", new DbToCs("(long?)", "long.Parse({0})", "{0}.ToString()", "long?", typeof(long), typeof(long?), "{0}.Value", "GetInt64") },
+
+                { "number(3)", new DbToCs("(byte?)", "byte.Parse({0})", "{0}.ToString()", "byte?", typeof(byte), typeof(byte?), "{0}.Value", "GetByte") },
+                { "number(5)", new DbToCs("(ushort?)", "ushort.Parse({0})", "{0}.ToString()", "ushort?", typeof(ushort), typeof(ushort?), "{0}.Value", "GetInt32") },
+                { "number(10)", new DbToCs("(uint?)", "uint.Parse({0})", "{0}.ToString()", "uint?", typeof(uint), typeof(uint?), "{0}.Value", "GetInt64") },
+                { "number(20)", new DbToCs("(ulong?)", "ulong.Parse({0})", "{0}.ToString()", "ulong?", typeof(ulong), typeof(ulong?), "{0}.Value", "GetDecimal") },
+
+                { "float(126)", new DbToCs("(double?)", "double.Parse({0})", "{0}.ToString()", "double?", typeof(double), typeof(double?), "{0}.Value", "GetDouble") },
+                { "float(63)", new DbToCs("(float?)", "float.Parse({0})", "{0}.ToString()", "float?", typeof(float), typeof(float?), "{0}.Value", "GetFloat") },
+                { "number(10,2)", new DbToCs("(decimal?)", "decimal.Parse({0})", "{0}.ToString()", "decimal?", typeof(decimal), typeof(decimal?), "{0}.Value", "GetDecimal") },
+
+                { "interval day(2) to second(6)", new DbToCs("(TimeSpan?)", "TimeSpan.Parse(double.Parse({0}))", "{0}.Ticks.ToString()", "TimeSpan?", typeof(TimeSpan), typeof(TimeSpan?), "{0}.Value", "GetValue") },
+                { "date(7)", new DbToCs("(DateTime?)", "new DateTime(long.Parse({0}))", "{0}.Ticks.ToString()", "DateTime?", typeof(DateTime), typeof(DateTime?), "{0}.Value", "GetValue") },
+                { "timestamp(6)", new DbToCs("(DateTime?)", "new DateTime(long.Parse({0}))", "{0}.Ticks.ToString()", "DateTime?", typeof(DateTime), typeof(DateTime?), "{0}.Value", "GetValue") },
+                { "timestamp(6) with local time zone", new DbToCs("(DateTime?)", "new DateTime(long.Parse({0}))", "{0}.Ticks.ToString()", "DateTime?", typeof(DateTime), typeof(DateTime?), "{0}.Value", "GetValue") },
+
+                { "blob", new DbToCs("(byte[])", "Convert.FromBase64String({0})", "Convert.ToBase64String({0})", "byte[]", typeof(byte[]), typeof(byte[]), "{0}", "GetValue") },
+
+                { "nvarchar2(255)", new DbToCs("", "{0}.Replace(StringifySplit, \"|\")", "{0}.Replace(\"|\", StringifySplit)", "string", typeof(string), typeof(string), "{0}", "GetString") },
+                { "char(36 char)", new DbToCs("(Guid?)", "Guid.Parse({0})", "{0}.ToString()", "Guid?", typeof(Guid), typeof(Guid?), "{0}.Value", "GetGuid") },
+            };
+            foreach (var kv in defaultDbToCs)
+                _dicDbToCs.TryAdd(kv.Key, kv.Value);
+        }
+
+
+        public string GetCsConvert(DbColumnInfo column) => _dicDbToCs.TryGetValue(column.DbTypeTextFull, out var trydc) ? (column.IsNullable ? trydc.csConvert : trydc.csConvert.Replace("?", "")) : null;
+        public string GetCsParse(DbColumnInfo column) => _dicDbToCs.TryGetValue(column.DbTypeTextFull, out var trydc) ? trydc.csParse : null;
+        public string GetCsStringify(DbColumnInfo column) => _dicDbToCs.TryGetValue(column.DbTypeTextFull, out var trydc) ? trydc.csStringify : null;
+        public string GetCsType(DbColumnInfo column) => _dicDbToCs.TryGetValue(column.DbTypeTextFull, out var trydc) ? (column.IsNullable ? trydc.csType : trydc.csType.Replace("?", "")) : null;
+        public Type GetCsTypeInfo(DbColumnInfo column) => _dicDbToCs.TryGetValue(column.DbTypeTextFull, out var trydc) ? trydc.csTypeInfo : null;
+        public string GetCsTypeValue(DbColumnInfo column) => _dicDbToCs.TryGetValue(column.DbTypeTextFull, out var trydc) ? trydc.csTypeValue : null;
+        public string GetDataReaderMethod(DbColumnInfo column) => _dicDbToCs.TryGetValue(column.DbTypeTextFull, out var trydc) ? trydc.dataReaderMethod : null;
+
+        public List<string> GetDatabases()
+        {
+            var sql = @" select username from all_users";
+            var ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
+            return ds.Select(a => a.FirstOrDefault()?.ToString()).ToList();
+        }
+
+        public List<DbTableInfo> GetTablesByDatabase(params string[] database2)
+        {
+            var loc1 = new List<DbTableInfo>();
+            var loc2 = new Dictionary<string, DbTableInfo>();
+            var loc3 = new Dictionary<string, Dictionary<string, DbColumnInfo>>();
+            var database = database2?.ToArray();
+
+            if (database == null || database.Any() == false)
+            {
+                var userUsers = _orm.Ado.ExecuteScalar(" select username from user_users")?.ToString();
+                if (string.IsNullOrEmpty(userUsers)) return loc1;
+                database = new[] { userUsers };
+            }
+            var databaseIn = string.Join(",", database.Select(a => _commonUtils.FormatSql("{0}", a)));
+            var sql = string.Format(@"
+select
+a.owner || '.' || a.table_name,
+a.owner,
+a.table_name,
+b.comments,
+'TABLE'
+from all_tables a
+left join all_tab_comments b on b.owner = a.owner and b.table_name = a.table_name and b.table_type = 'TABLE'
+where a.owner in ({0})", databaseIn);
+            var ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
+            if (ds == null) return loc1;
+
+            var loc6 = new List<string[]>();
+            var loc66 = new List<string[]>();
+            var loc6_1000 = new List<string>();
+            var loc66_1000 = new List<string>();
+            foreach (var row in ds)
+            {
+                var table_id = string.Concat(row[0]);
+                var schema = string.Concat(row[1]);
+                var table = string.Concat(row[2]);
+                var comment = string.Concat(row[3]);
+                var type = string.Concat(row[4]) == "VIEW" ? DbTableType.VIEW : DbTableType.TABLE;
+                if (database.Length == 1)
+                {
+                    table_id = table_id.Substring(table_id.IndexOf('.') + 1);
+                    schema = "";
+                }
+                loc2.Add(table_id, new DbTableInfo { Id = table_id, Schema = schema, Name = table, Comment = comment, Type = type });
+                loc3.Add(table_id, new Dictionary<string, DbColumnInfo>());
+                switch (type)
+                {
+                    case DbTableType.TABLE:
+                    case DbTableType.VIEW:
+                        loc6_1000.Add(table.Replace("'", "''"));
+                        if (loc6_1000.Count >= 999)
+                        {
+                            loc6.Add(loc6_1000.ToArray());
+                            loc6_1000.Clear();
+                        }
+                        break;
+                    case DbTableType.StoreProcedure:
+                        loc66_1000.Add(table.Replace("'", "''"));
+                        if (loc66_1000.Count >= 999)
+                        {
+                            loc66.Add(loc66_1000.ToArray());
+                            loc66_1000.Clear();
+                        }
+                        break;
+                }
+            }
+            if (loc6_1000.Count > 0) loc6.Add(loc6_1000.ToArray());
+            if (loc66_1000.Count > 0) loc66.Add(loc66_1000.ToArray());
+
+            if (loc6.Count == 0) return loc1;
+            var loc8 = new StringBuilder().Append("(");
+            for (var loc8idx = 0; loc8idx < loc6.Count; loc8idx++)
+            {
+                if (loc8idx > 0) loc8.Append(" OR ");
+                loc8.Append("a.table_name in (");
+                for (var loc8idx2 = 0; loc8idx2 < loc6[loc8idx].Length; loc8idx2++)
+                {
+                    if (loc8idx2 > 0) loc8.Append(",");
+                    loc8.Append($"'{loc6[loc8idx][loc8idx2]}'");
+                }
+                loc8.Append(")");
+            }
+            loc8.Append(")");
+
+            sql = string.Format(@"
+select
+a.owner || '.' || a.table_name,
+a.column_name,
+a.data_type,
+a.data_length,
+a.data_precision,
+a.data_scale,
+a.char_used,
+case when a.nullable = 'N' then 0 else 1 end,
+nvl((select 1 from user_sequences where upper(sequence_name)=upper(a.table_name||'_seq_'||a.column_name) and rownum < 2), 0),
+b.comments,
+a.data_default
+from all_tab_cols a
+left join all_col_comments b on b.owner = a.owner and b.table_name = a.table_name and b.column_name = a.column_name
+where a.owner in ({1}) and {0}
+", loc8, databaseIn);
+            ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
+            if (ds == null) return loc1;
+
+            var ds2 = new List<object[]>();
+            foreach (var row in ds)
+            {
+                var ds2item = new object[9];
+                ds2item[0] = row[0];
+                ds2item[1] = row[1];
+                ds2item[2] = Regex.Replace(string.Concat(row[2]), @"\(\d+\)", "");
+                ds2item[4] = DamengCodeFirst.GetDamengSqlTypeFullName(new object[] { row[1], row[2], row[3], row[4], row[5], row[6] });
+                ds2item[5] = string.Concat(row[7]) == "1";
+                ds2item[6] = string.Concat(row[8]) == "1";
+                ds2item[7] = string.Concat(row[9]);
+                ds2item[8] = string.Concat(row[10]);
+                ds2.Add(ds2item);
+            }
+            foreach (var row in ds2)
+            {
+                string table_id = string.Concat(row[0]);
+                string column = string.Concat(row[1]);
+                string type = string.Concat(row[2]);
+                //long max_length = long.Parse(string.Concat(row[3]));
+                string sqlType = string.Concat(row[4]);
+                var m_len = Regex.Match(sqlType, @"\w+\((\d+)");
+                int max_length = m_len.Success ? int.Parse(m_len.Groups[1].Value) : -1;
+                bool is_nullable = string.Concat(row[5]) == "1";
+                bool is_identity = string.Concat(row[6]) == "1";
+                string comment = string.Concat(row[7]);
+                string defaultValue = string.Concat(row[8]);
+                if (max_length == 0) max_length = -1;
+                if (database.Length == 1)
+                {
+                    table_id = table_id.Substring(table_id.IndexOf('.') + 1);
+                }
+                loc3[table_id].Add(column, new DbColumnInfo
+                {
+                    Name = column,
+                    MaxLength = max_length,
+                    IsIdentity = is_identity,
+                    IsNullable = is_nullable,
+                    IsPrimary = false,
+                    DbTypeText = type,
+                    DbTypeTextFull = sqlType,
+                    Table = loc2[table_id],
+                    Coment = comment,
+                    DefaultValue = defaultValue
+                });
+                loc3[table_id][column].DbType = this.GetDbType(loc3[table_id][column]);
+                loc3[table_id][column].CsType = this.GetCsTypeInfo(loc3[table_id][column]);
+            }
+
+            sql = string.Format(@"
+select
+a.table_owner || '.' || a.table_name,
+c.column_name,
+c.index_name,
+case when a.uniqueness = 'UNIQUE' then 1 else 0 end,
+case when exists(select 1 from all_constraints where constraint_name = a.index_name and constraint_type = 'P') then 1 else 0 end,
+0,
+case when c.descend = 'DESC' then 1 else 0 end,
+c.column_position
+from all_indexes a,
+all_ind_columns c 
+where a.index_name = c.index_name
+and a.table_owner = c.table_owner
+and a.table_name = c.table_name
+and a.table_owner in ({1}) and {0}
+", loc8, databaseIn);
+            ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
+            if (ds == null) return loc1;
+
+            var indexColumns = new Dictionary<string, Dictionary<string, DbIndexInfo>>();
+            var uniqueColumns = new Dictionary<string, Dictionary<string, DbIndexInfo>>();
+            foreach (var row in ds)
+            {
+                string table_id = string.Concat(row[0]);
+                string column = string.Concat(row[1]).Trim('"');
+                string index_id = string.Concat(row[2]);
+                bool is_unique = string.Concat(row[3]) == "1";
+                bool is_primary_key = string.Concat(row[4]) == "1";
+                bool is_clustered = string.Concat(row[5]) == "1";
+                bool is_desc = string.Concat(row[6]) == "1";
+                if (database.Length == 1)
+                    table_id = table_id.Substring(table_id.IndexOf('.') + 1);
+                if (loc3.ContainsKey(table_id) == false || loc3[table_id].ContainsKey(column) == false) continue;
+                var loc9 = loc3[table_id][column];
+                if (loc9.IsPrimary == false && is_primary_key) loc9.IsPrimary = is_primary_key;
+                if (is_primary_key) continue;
+
+                Dictionary<string, DbIndexInfo> loc10 = null;
+                DbIndexInfo loc11 = null;
+                if (!indexColumns.TryGetValue(table_id, out loc10))
+                    indexColumns.Add(table_id, loc10 = new Dictionary<string, DbIndexInfo>());
+                if (!loc10.TryGetValue(index_id, out loc11))
+                    loc10.Add(index_id, loc11 = new DbIndexInfo());
+                loc11.Columns.Add(new DbIndexColumnInfo { Column = loc9, IsDesc = is_desc });
+                if (is_unique && !is_primary_key)
+                {
+                    if (!uniqueColumns.TryGetValue(table_id, out loc10))
+                        uniqueColumns.Add(table_id, loc10 = new Dictionary<string, DbIndexInfo>());
+                    if (!loc10.TryGetValue(index_id, out loc11))
+                        loc10.Add(index_id, loc11 = new DbIndexInfo());
+                    loc11.Columns.Add(new DbIndexColumnInfo { Column = loc9, IsDesc = is_desc });
+                }
+            }
+            foreach (string table_id in indexColumns.Keys)
+            {
+                foreach (var column in indexColumns[table_id])
+                    loc2[table_id].IndexesDict.Add(column.Key, column.Value);
+            }
+            foreach (string table_id in uniqueColumns.Keys)
+            {
+                foreach (var column in uniqueColumns[table_id])
+                {
+                    column.Value.Columns.Sort((c1, c2) => c1.Column.Name.CompareTo(c2.Column.Name));
+                    loc2[table_id].UniquesDict.Add(column.Key, column.Value);
+                }
+            }
+
+            sql = string.Format(@"
+select
+a.owner || '.' || a.table_name,
+c.column_name,
+c.constraint_name,
+b.owner || '.' || b.table_name,
+1,
+d.column_name
+
+-- a.owner 外键拥有者,
+-- a.table_name 外键表,
+-- c.column_name 外键列,
+-- b.owner 主键拥有者,
+-- b.table_name 主键表,
+-- d.column_name 主键列,
+-- c.constraint_name 外键名,
+-- d.constraint_name 主键名
+
+from
+all_constraints a,
+all_constraints b,
+all_cons_columns c, --外键表
+all_cons_columns d  --主键表
+where
+a.r_constraint_name = b.constraint_name 　　
+and a.constraint_type = 'R' 　　
+and b.constraint_type = 'P' 　　
+and a.r_owner = b.owner 　　
+and a.constraint_name = c.constraint_name 　　
+and b.constraint_name = d.constraint_name 　　
+and a.owner = c.owner 　　
+and a.table_name = c.table_name 　　
+and b.owner = d.owner 　　
+and b.table_name = d.table_name
+and a.owner in ({1}) and {0}
+", loc8, databaseIn);
+            ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
+            if (ds == null) return loc1;
+
+            var fkColumns = new Dictionary<string, Dictionary<string, DbForeignInfo>>();
+            foreach (var row in ds)
+            {
+                string table_id = string.Concat(row[0]);
+                string column = string.Concat(row[1]);
+                string fk_id = string.Concat(row[2]);
+                string ref_table_id = string.Concat(row[3]);
+                bool is_foreign_key = string.Concat(row[4]) == "1";
+                string referenced_column = string.Concat(row[5]);
+                if (database.Length == 1)
+                {
+                    table_id = table_id.Substring(table_id.IndexOf('.') + 1);
+                    ref_table_id = ref_table_id.Substring(ref_table_id.IndexOf('.') + 1);
+                }
+                if (loc3.ContainsKey(table_id) == false || loc3[table_id].ContainsKey(column) == false) continue;
+                var loc9 = loc3[table_id][column];
+                if (loc2.ContainsKey(ref_table_id) == false) continue;
+                var loc10 = loc2[ref_table_id];
+                var loc11 = loc3[ref_table_id][referenced_column];
+
+                Dictionary<string, DbForeignInfo> loc12 = null;
+                DbForeignInfo loc13 = null;
+                if (!fkColumns.TryGetValue(table_id, out loc12))
+                    fkColumns.Add(table_id, loc12 = new Dictionary<string, DbForeignInfo>());
+                if (!loc12.TryGetValue(fk_id, out loc13))
+                    loc12.Add(fk_id, loc13 = new DbForeignInfo { Table = loc2[table_id], ReferencedTable = loc10 });
+                loc13.Columns.Add(loc9);
+                loc13.ReferencedColumns.Add(loc11);
+            }
+            foreach (var table_id in fkColumns.Keys)
+                foreach (var fk in fkColumns[table_id])
+                    loc2[table_id].ForeignsDict.Add(fk.Key, fk.Value);
+
+            foreach (var table_id in loc3.Keys)
+            {
+                foreach (var loc5 in loc3[table_id].Values)
+                {
+                    loc2[table_id].Columns.Add(loc5);
+                    if (loc5.IsIdentity) loc2[table_id].Identitys.Add(loc5);
+                    if (loc5.IsPrimary) loc2[table_id].Primarys.Add(loc5);
+                }
+            }
+            foreach (var loc4 in loc2.Values)
+            {
+                //if (loc4.Primarys.Count == 0 && loc4.UniquesDict.Count > 0)
+                //{
+                //    foreach (var loc5 in loc4.UniquesDict.First().Value.Columns)
+                //    {
+                //        loc5.Column.IsPrimary = true;
+                //        loc4.Primarys.Add(loc5.Column);
+                //    }
+                //}
+                loc4.Primarys.Sort((c1, c2) => c1.Name.CompareTo(c2.Name));
+                loc4.Columns.Sort((c1, c2) =>
+                {
+                    int compare = c2.IsPrimary.CompareTo(c1.IsPrimary);
+                    if (compare == 0)
+                    {
+                        bool b1 = loc4.ForeignsDict.Values.Where(fk => fk.Columns.Where(c3 => c3.Name == c1.Name).Any()).Any();
+                        bool b2 = loc4.ForeignsDict.Values.Where(fk => fk.Columns.Where(c3 => c3.Name == c2.Name).Any()).Any();
+                        compare = b2.CompareTo(b1);
+                    }
+                    if (compare == 0) compare = c1.Name.CompareTo(c2.Name);
+                    return compare;
+                });
+                loc1.Add(loc4);
+            }
+            loc1.Sort((t1, t2) =>
+            {
+                var ret = t1.Schema.CompareTo(t2.Schema);
+                if (ret == 0) ret = t1.Name.CompareTo(t2.Name);
+                return ret;
+            });
+
+            loc2.Clear();
+            loc3.Clear();
+            return loc1;
+        }
+
+        public List<DbEnumInfo> GetEnumsByDatabase(params string[] database)
+        {
+            return new List<DbEnumInfo>();
+        }
+    }
+}

Providers/FreeSql.Provider.Dameng/DamengExpression.cs

@@ -0,0 +1,469 @@
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+
+namespace FreeSql.Dameng
+{
+    class DamengExpression : CommonExpression
+    {
+
+        public DamengExpression(CommonUtils common) : base(common) { }
+
+        public override string ExpressionLambdaToSqlOther(Expression exp, ExpTSC tsc)
+        {
+            Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
+            switch (exp.NodeType)
+            {
+                case ExpressionType.Convert:
+                    var operandExp = (exp as UnaryExpression)?.Operand;
+                    var gentype = exp.Type.NullableTypeOrThis();
+                    if (gentype != operandExp.Type.NullableTypeOrThis())
+                    {
+                        switch (exp.Type.NullableTypeOrThis().ToString())
+                        {
+                            //case "System.Boolean": return $"({getExp(operandExp)} not in ('0','false'))";
+                            case "System.Byte": return $"cast({getExp(operandExp)} as number)";
+                            case "System.Char": return $"substr(to_char({getExp(operandExp)}), 1, 1)";
+                            case "System.DateTime": return $"to_timestamp({getExp(operandExp)},'YYYY-MM-DD HH24:MI:SS.FF6')";
+                            case "System.Decimal": return $"cast({getExp(operandExp)} as number)";
+                            case "System.Double": return $"cast({getExp(operandExp)} as number)";
+                            case "System.Int16":
+                            case "System.Int32":
+                            case "System.Int64":
+                            case "System.SByte": return $"cast({getExp(operandExp)} as number)";
+                            case "System.Single": return $"cast({getExp(operandExp)} as number)";
+                            case "System.String": return $"to_char({getExp(operandExp)})";
+                            case "System.UInt16":
+                            case "System.UInt32":
+                            case "System.UInt64": return $"cast({getExp(operandExp)} as number)";
+                            case "System.Guid":
+                                if (tsc.mapType == typeof(byte[])) return $"hextoraw({getExp(operandExp)})";
+                                return $"to_char({getExp(operandExp)})";
+                        }
+                    }
+                    break;
+                case ExpressionType.Call:
+                    var callExp = exp as MethodCallExpression;
+
+                    switch (callExp.Method.Name)
+                    {
+                        case "Parse":
+                        case "TryParse":
+                            switch (callExp.Method.DeclaringType.NullableTypeOrThis().ToString())
+                            {
+                                //case "System.Boolean": return $"({getExp(callExp.Arguments[0])} not in ('0','false'))";
+                                case "System.Byte": return $"cast({getExp(callExp.Arguments[0])} as number)";
+                                case "System.Char": return $"substr(to_char({getExp(callExp.Arguments[0])}), 1, 1)";
+                                case "System.DateTime": return $"to_timestamp({getExp(callExp.Arguments[0])},'YYYY-MM-DD HH24:MI:SS.FF6')";
+                                case "System.Decimal": return $"cast({getExp(callExp.Arguments[0])} as number)";
+                                case "System.Double": return $"cast({getExp(callExp.Arguments[0])} as number)";
+                                case "System.Int16":
+                                case "System.Int32":
+                                case "System.Int64":
+                                case "System.SByte": return $"cast({getExp(callExp.Arguments[0])} as number)";
+                                case "System.Single": return $"cast({getExp(callExp.Arguments[0])} as number)";
+                                case "System.UInt16":
+                                case "System.UInt32":
+                                case "System.UInt64": return $"cast({getExp(callExp.Arguments[0])} as number)";
+                                case "System.Guid":
+                                    if (tsc.mapType == typeof(byte[])) return $"hextoraw({getExp(callExp.Arguments[0])})";
+                                    return $"to_char({getExp(callExp.Arguments[0])})";
+                            }
+                            return null;
+                        case "NewGuid":
+                            return null;
+                        case "Next":
+                            if (callExp.Object?.Type == typeof(Random)) return "cast(dbms_random.value*1000000000 as smallint)";
+                            return null;
+                        case "NextDouble":
+                            if (callExp.Object?.Type == typeof(Random)) return "dbms_random.value";
+                            return null;
+                        case "Random":
+                            if (callExp.Method.DeclaringType.IsNumberType()) return "dbms_random.value";
+                            return null;
+                        case "ToString":
+                            if (callExp.Object != null) return callExp.Arguments.Count == 0 ? $"to_char({getExp(callExp.Object)})" : null;
+                            return null;
+                    }
+
+                    var objExp = callExp.Object;
+                    var objType = objExp?.Type;
+                    if (objType?.FullName == "System.Byte[]") return null;
+
+                    var argIndex = 0;
+                    if (objType == null && callExp.Method.DeclaringType == typeof(Enumerable))
+                    {
+                        objExp = callExp.Arguments.FirstOrDefault();
+                        objType = objExp?.Type;
+                        argIndex++;
+                    }
+                    if (objType == null) objType = callExp.Method.DeclaringType;
+                    if (objType != null || objType.IsArrayOrList())
+                    {
+                        if (argIndex >= callExp.Arguments.Count) break;
+                        tsc.SetMapColumnTmp(null);
+                        var args1 = getExp(callExp.Arguments[argIndex]);
+                        var oldMapType = tsc.SetMapTypeReturnOld(tsc.mapTypeTmp);
+                        var oldDbParams = tsc.SetDbParamsReturnOld(null);
+                        var left = objExp == null ? null : getExp(objExp);
+                        tsc.SetMapColumnTmp(null).SetMapTypeReturnOld(oldMapType);
+                        tsc.SetDbParamsReturnOld(oldDbParams);
+                        switch (callExp.Method.Name)
+                        {
+                            case "Contains":
+                                //判断 in //在各大 Provider AdoProvider 中已约定，500元素分割, 3空格\r\n4空格
+                                return $"(({args1}) in {left.Replace(",   \r\n    \r\n", $") \r\n OR ({args1}) in (")})";
+                        }
+                    }
+                    break;
+                case ExpressionType.NewArrayInit:
+                    var arrExp = exp as NewArrayExpression;
+                    var arrSb = new StringBuilder();
+                    arrSb.Append("(");
+                    for (var a = 0; a < arrExp.Expressions.Count; a++)
+                    {
+                        if (a > 0) arrSb.Append(",");
+                        arrSb.Append(getExp(arrExp.Expressions[a]));
+                    }
+                    if (arrSb.Length == 1) arrSb.Append("NULL");
+                    return arrSb.Append(")").ToString();
+                case ExpressionType.ListInit:
+                    var listExp = exp as ListInitExpression;
+                    var listSb = new StringBuilder();
+                    listSb.Append("(");
+                    for (var a = 0; a < listExp.Initializers.Count; a++)
+                    {
+                        if (listExp.Initializers[a].Arguments.Any() == false) continue;
+                        if (a > 0) listSb.Append(",");
+                        listSb.Append(getExp(listExp.Initializers[a].Arguments.FirstOrDefault()));
+                    }
+                    if (listSb.Length == 1) listSb.Append("NULL");
+                    return listSb.Append(")").ToString();
+                case ExpressionType.New:
+                    var newExp = exp as NewExpression;
+                    if (typeof(IList).IsAssignableFrom(newExp.Type))
+                    {
+                        if (newExp.Arguments.Count == 0) return "(NULL)";
+                        if (typeof(IEnumerable).IsAssignableFrom(newExp.Arguments[0].Type) == false) return "(NULL)";
+                        return getExp(newExp.Arguments[0]);
+                    }
+                    return null;
+            }
+            return null;
+        }
+
+        public override string ExpressionLambdaToSqlMemberAccessString(MemberExpression exp, ExpTSC tsc)
+        {
+            if (exp.Expression == null)
+            {
+                switch (exp.Member.Name)
+                {
+                    case "Empty": return "''";
+                }
+                return null;
+            }
+            var left = ExpressionLambdaToSql(exp.Expression, tsc);
+            switch (exp.Member.Name)
+            {
+                case "Length": return $"length({left})";
+            }
+            return null;
+        }
+        public override string ExpressionLambdaToSqlMemberAccessDateTime(MemberExpression exp, ExpTSC tsc)
+        {
+            if (exp.Expression == null)
+            {
+                switch (exp.Member.Name)
+                {
+                    case "Now": return _common.Now;
+                    case "UtcNow": return _common.NowUtc;
+                    case "Today": return "trunc(systimestamp)";
+                    case "MinValue": return "to_timestamp('0001-01-01 00:00:00','YYYY-MM-DD HH24:MI:SS.FF6')";
+                    case "MaxValue": return "to_timestamp('9999-12-31 23:59:59','YYYY-MM-DD HH24:MI:SS.FF6')";
+                }
+                return null;
+            }
+            var left = ExpressionLambdaToSql(exp.Expression, tsc);
+            switch (exp.Member.Name)
+            {
+                case "Date": return $"trunc({left})";
+                case "TimeOfDay": return $"(cast({left} as timestamp with time zone)-trunc({left}))";
+                case "DayOfWeek": return $"case when to_char({left})='7' then 0 else cast(to_char({left}) as number) end";
+                case "Day": return $"cast(to_char({left},'DD') as number)";
+                case "DayOfYear": return $"cast(to_char({left},'DDD') as number)";
+                case "Month": return $"cast(to_char({left},'MM') as number)";
+                case "Year": return $"cast(to_char({left},'YYYY') as number)";
+                case "Hour": return $"cast(to_char({left},'HH24') as number)";
+                case "Minute": return $"cast(to_char({left},'MI') as number)";
+                case "Second": return $"cast(to_char({left},'SS') as number)";
+                case "Millisecond": return $"cast(to_char({left},'FF3') as number)";
+                case "Ticks": return $"cast(to_char({left},'FF7') as number)";
+            }
+            return null;
+        }
+        public override string ExpressionLambdaToSqlMemberAccessTimeSpan(MemberExpression exp, ExpTSC tsc)
+        {
+            if (exp.Expression == null)
+            {
+                switch (exp.Member.Name)
+                {
+                    case "Zero": return "numtodsinterval(0,'second')";
+                    case "MinValue": return "numtodsinterval(-233720368.5477580,'second')";
+                    case "MaxValue": return "numtodsinterval(233720368.5477580,'second')";
+                }
+                return null;
+            }
+            var left = ExpressionLambdaToSql(exp.Expression, tsc);
+            switch (exp.Member.Name)
+            {
+                case "Days": return $"extract(day from {left})";
+                case "Hours": return $"extract(hour from {left})";
+                case "Milliseconds": return $"cast(substr(extract(second from {left})-floor(extract(second from {left})),2,3) as number)";
+                case "Minutes": return $"extract(minute from {left})";
+                case "Seconds": return $"floor(extract(second from {left}))";
+                case "Ticks": return $"(extract(day from {left})*86400+extract(hour from {left})*3600+extract(minute from {left})*60+extract(second from {left}))*10000000";
+                case "TotalDays": return $"extract(day from {left})";
+                case "TotalHours": return $"(extract(day from {left})*24+extract(hour from {left}))";
+                case "TotalMilliseconds": return $"(extract(day from {left})*86400+extract(hour from {left})*3600+extract(minute from {left})*60+extract(second from {left}))*1000";
+                case "TotalMinutes": return $"(extract(day from {left})*1440+extract(hour from {left})*60+extract(minute from {left}))";
+                case "TotalSeconds": return $"(extract(day from {left})*86400+extract(hour from {left})*3600+extract(minute from {left})*60+extract(second from {left}))";
+            }
+            return null;
+        }
+
+        public override string ExpressionLambdaToSqlCallString(MethodCallExpression exp, ExpTSC tsc)
+        {
+            Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
+            if (exp.Object == null)
+            {
+                switch (exp.Method.Name)
+                {
+                    case "IsNullOrEmpty":
+                        var arg1 = getExp(exp.Arguments[0]);
+                        return $"({arg1} is null or {arg1} = '')";
+                    case "IsNullOrWhiteSpace":
+                        var arg2 = getExp(exp.Arguments[0]);
+                        return $"({arg2} is null or {arg2} = '' or ltrim({arg2}) = '')";
+                    case "Concat":
+                        return _common.StringConcat(exp.Arguments.Select(a => getExp(a)).ToArray(), null);
+                }
+            }
+            else
+            {
+                var left = getExp(exp.Object);
+                switch (exp.Method.Name)
+                {
+                    case "StartsWith":
+                    case "EndsWith":
+                    case "Contains":
+                        var args0Value = getExp(exp.Arguments[0]);
+                        if (args0Value == "NULL") return $"({left}) IS NULL";
+                        if (exp.Method.Name == "StartsWith") return $"({left}) LIKE {(args0Value.EndsWith("'") ? args0Value.Insert(args0Value.Length - 1, "%") : $"(to_char({args0Value})||'%')")}";
+                        if (exp.Method.Name == "EndsWith") return $"({left}) LIKE {(args0Value.StartsWith("'") ? args0Value.Insert(1, "%") : $"('%'||to_char({args0Value}))")}";
+                        if (args0Value.StartsWith("'") && args0Value.EndsWith("'")) return $"({left}) LIKE {args0Value.Insert(1, "%").Insert(args0Value.Length, "%")}";
+                        return $"({left}) LIKE ('%'||to_char({args0Value})||'%')";
+                    case "ToLower": return $"lower({left})";
+                    case "ToUpper": return $"upper({left})";
+                    case "Substring":
+                        var substrArgs1 = getExp(exp.Arguments[0]);
+                        if (long.TryParse(substrArgs1, out var testtrylng1)) substrArgs1 = (testtrylng1 + 1).ToString();
+                        else substrArgs1 += "+1";
+                        if (exp.Arguments.Count == 1) return $"substr({left}, {substrArgs1})";
+                        return $"substr({left}, {substrArgs1}, {getExp(exp.Arguments[1])})";
+                    case "IndexOf":
+                        var indexOfFindStr = getExp(exp.Arguments[0]);
+                        if (exp.Arguments.Count > 1 && exp.Arguments[1].Type.FullName == "System.Int32")
+                        {
+                            var locateArgs1 = getExp(exp.Arguments[1]);
+                            if (long.TryParse(locateArgs1, out var testtrylng2)) locateArgs1 = (testtrylng2 + 1).ToString();
+                            else locateArgs1 += "+1";
+                            return $"(instr({left}, {indexOfFindStr}, {locateArgs1}, 1)-1)";
+                        }
+                        return $"(instr({left}, {indexOfFindStr}, 1, 1))-1";
+                    case "PadLeft":
+                        if (exp.Arguments.Count == 1) return $"lpad({left}, {getExp(exp.Arguments[0])}, ' ')";
+                        return $"lpad({left}, {getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
+                    case "PadRight":
+                        if (exp.Arguments.Count == 1) return $"rpad({left}, {getExp(exp.Arguments[0])}, ' ')";
+                        return $"rpad({left}, {getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
+                    case "Trim":
+                    case "TrimStart":
+                    case "TrimEnd":
+                        if (exp.Arguments.Count == 0)
+                        {
+                            if (exp.Method.Name == "Trim") return $"trim({left})";
+                            if (exp.Method.Name == "TrimStart") return $"ltrim({left})";
+                            if (exp.Method.Name == "TrimEnd") return $"rtrim({left})";
+                        }
+                        foreach (var argsTrim02 in exp.Arguments)
+                        {
+                            var argsTrim01s = new[] { argsTrim02 };
+                            if (argsTrim02.NodeType == ExpressionType.NewArrayInit)
+                            {
+                                var arritem = argsTrim02 as NewArrayExpression;
+                                argsTrim01s = arritem.Expressions.ToArray();
+                            }
+                            foreach (var argsTrim01 in argsTrim01s)
+                            {
+                                if (exp.Method.Name == "Trim") left = $"trim(both {getExp(argsTrim01)} from {left})";
+                                if (exp.Method.Name == "TrimStart") left = $"ltrim({left},{getExp(argsTrim01)})";
+                                if (exp.Method.Name == "TrimEnd") left = $"rtrim({left},{getExp(argsTrim01)})";
+                            }
+                        }
+                        return left;
+                    case "Replace": return $"replace({left}, {getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
+                    case "CompareTo": return $"case when {left} = {getExp(exp.Arguments[0])} then 0 when {left} > {getExp(exp.Arguments[0])} then 1 else -1 end";
+                    case "Equals": return $"({left} = {getExp(exp.Arguments[0])})";
+                }
+            }
+            return null;
+        }
+        public override string ExpressionLambdaToSqlCallMath(MethodCallExpression exp, ExpTSC tsc)
+        {
+            Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
+            switch (exp.Method.Name)
+            {
+                case "Abs": return $"abs({getExp(exp.Arguments[0])})";
+                case "Sign": return $"sign({getExp(exp.Arguments[0])})";
+                case "Floor": return $"floor({getExp(exp.Arguments[0])})";
+                case "Ceiling": return $"ceil({getExp(exp.Arguments[0])})";
+                case "Round":
+                    if (exp.Arguments.Count > 1 && exp.Arguments[1].Type.FullName == "System.Int32") return $"round({getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
+                    return $"round({getExp(exp.Arguments[0])})";
+                case "Exp": return $"exp({getExp(exp.Arguments[0])})";
+                case "Log":
+                    if (exp.Arguments.Count > 1) return $"log({getExp(exp.Arguments[1])},{getExp(exp.Arguments[0])})";
+                    return $"log(2.7182818284590451,{getExp(exp.Arguments[0])})";
+                case "Log10": return $"log(10,{getExp(exp.Arguments[0])})";
+                case "Pow": return $"power({getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
+                case "Sqrt": return $"sqrt({getExp(exp.Arguments[0])})";
+                case "Cos": return $"cos({getExp(exp.Arguments[0])})";
+                case "Sin": return $"sin({getExp(exp.Arguments[0])})";
+                case "Tan": return $"tan({getExp(exp.Arguments[0])})";
+                case "Acos": return $"acos({getExp(exp.Arguments[0])})";
+                case "Asin": return $"asin({getExp(exp.Arguments[0])})";
+                case "Atan": return $"atan({getExp(exp.Arguments[0])})";
+                //case "Atan2": return $"atan2({getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
+                case "Truncate": return $"trunc({getExp(exp.Arguments[0])}, 0)";
+            }
+            return null;
+        }
+        public override string ExpressionLambdaToSqlCallDateTime(MethodCallExpression exp, ExpTSC tsc)
+        {
+            Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
+            if (exp.Object == null)
+            {
+                switch (exp.Method.Name)
+                {
+                    case "Compare": return $"extract(day from ({getExp(exp.Arguments[0])}-({getExp(exp.Arguments[1])})))";
+                    case "DaysInMonth": return $"cast(to_char(last_day(({getExp(exp.Arguments[0])})||'-'||({getExp(exp.Arguments[1])})||'-01'),'DD') as number)";
+                    case "Equals": return $"({getExp(exp.Arguments[0])} = {getExp(exp.Arguments[1])})";
+
+                    case "IsLeapYear":
+                        var isLeapYearArgs1 = getExp(exp.Arguments[0]);
+                        return $"(mod({isLeapYearArgs1},4)=0 AND mod({isLeapYearArgs1},100)<>0 OR mod({isLeapYearArgs1},400)=0)";
+
+                    case "Parse": return $"to_timestamp({getExp(exp.Arguments[0])},'YYYY-MM-DD HH24:MI:SS.FF6')";
+                    case "ParseExact":
+                    case "TryParse":
+                    case "TryParseExact": return $"to_timestamp({getExp(exp.Arguments[0])},'YYYY-MM-DD HH24:MI:SS.FF6')";
+                }
+            }
+            else
+            {
+                var left = getExp(exp.Object);
+                var args1 = exp.Arguments.Count == 0 ? null : getExp(exp.Arguments[0]);
+                switch (exp.Method.Name)
+                {
+                    case "Add": return $"({left}+{args1})";
+                    case "AddDays": return $"({left}+{args1})";
+                    case "AddHours": return $"({left}+({args1})/24)";
+                    case "AddMilliseconds": return $"({left}+({args1})/86400000)";
+                    case "AddMinutes": return $"({left}+({args1})/1440)";
+                    case "AddMonths": return $"add_months({left},{args1})";
+                    case "AddSeconds": return $"({left}+({args1})/86400)";
+                    case "AddTicks": return $"({left}+({args1})/864000000000)";
+                    case "AddYears": return $"add_months({left},({args1})*12)";
+                    case "Subtract":
+                        switch ((exp.Arguments[0].Type.IsNullableType() ? exp.Arguments[0].Type.GetGenericArguments().FirstOrDefault() : exp.Arguments[0].Type).FullName)
+                        {
+                            case "System.DateTime": return $"(cast({left} as timestamp with time zone)-{args1})";
+                            case "System.TimeSpan": return $"({left}-{args1})";
+                        }
+                        break;
+                    case "Equals": return $"({left} = {args1})";
+                    case "CompareTo": return $"extract(day from ({left}-({args1})))";
+                    case "ToString": return exp.Arguments.Count == 0 ? $"to_char({left},'YYYY-MM-DD HH24:MI:SS.FF6')" : null;
+                }
+            }
+            return null;
+        }
+        public override string ExpressionLambdaToSqlCallTimeSpan(MethodCallExpression exp, ExpTSC tsc)
+        {
+            Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
+            if (exp.Object == null)
+            {
+                switch (exp.Method.Name)
+                {
+                    case "Compare": return $"extract(day from ({getExp(exp.Arguments[0])}-({getExp(exp.Arguments[1])})))";
+                    case "Equals": return $"({getExp(exp.Arguments[0])} = {getExp(exp.Arguments[1])})";
+                    case "FromDays": return $"numtodsinterval(({getExp(exp.Arguments[0])})*{(long)60 * 60 * 24},'second')";
+                    case "FromHours": return $"numtodsinterval(({getExp(exp.Arguments[0])})*{(long)60 * 60},'second')";
+                    case "FromMilliseconds": return $"numtodsinterval(({getExp(exp.Arguments[0])})/1000,'second')";
+                    case "FromMinutes": return $"numtodsinterval(({getExp(exp.Arguments[0])})*60,'second')";
+                    case "FromSeconds": return $"numtodsinterval(({getExp(exp.Arguments[0])}),'second')";
+                    case "FromTicks": return $"numtodsinterval(({getExp(exp.Arguments[0])})/10000000,'second')";
+                    case "Parse": return $"cast({getExp(exp.Arguments[0])} as interval day(9) to second(6))";
+                    case "ParseExact":
+                    case "TryParse":
+                    case "TryParseExact": return $"cast({getExp(exp.Arguments[0])} as interval day(9) to second(6))";
+                }
+            }
+            else
+            {
+                var left = getExp(exp.Object);
+                var args1 = exp.Arguments.Count == 0 ? null : getExp(exp.Arguments[0]);
+                switch (exp.Method.Name)
+                {
+                    case "Add": return $"({left}+{args1})";
+                    case "Subtract": return $"({left}-({args1}))";
+                    case "Equals": return $"({left} = {args1})";
+                    case "CompareTo": return $"extract(day from ({left}-({args1})))";
+                    case "ToString": return $"to_char({left})";
+                }
+            }
+            return null;
+        }
+        public override string ExpressionLambdaToSqlCallConvert(MethodCallExpression exp, ExpTSC tsc)
+        {
+            Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
+            if (exp.Object == null)
+            {
+                switch (exp.Method.Name)
+                {
+                    //case "ToBoolean": return $"({getExp(exp.Arguments[0])} not in ('0','false'))";
+                    case "ToByte": return $"cast({getExp(exp.Arguments[0])} as number)";
+                    case "ToChar": return $"substr(to_char({getExp(exp.Arguments[0])}), 1, 1)";
+                    case "ToDateTime": return $"to_timestamp({getExp(exp.Arguments[0])},'YYYY-MM-DD HH24:MI:SS.FF6')";
+                    case "ToDecimal": return $"cast({getExp(exp.Arguments[0])} as number)";
+                    case "ToDouble": return $"cast({getExp(exp.Arguments[0])} as number)";
+                    case "ToInt16":
+                    case "ToInt32":
+                    case "ToInt64":
+                    case "ToSByte": return $"cast({getExp(exp.Arguments[0])} as number)";
+                    case "ToSingle": return $"cast({getExp(exp.Arguments[0])} as number)";
+                    case "ToString": return $"to_char({getExp(exp.Arguments[0])})";
+                    case "ToUInt16":
+                    case "ToUInt32":
+                    case "ToUInt64": return $"cast({getExp(exp.Arguments[0])} as number)";
+                }
+            }
+            return null;
+        }
+    }
+}

Providers/FreeSql.Provider.Dameng/DamengExtensions.cs

@@ -0,0 +1,12 @@
+public static partial class FreeSqlDamengGlobalExtensions
+{
+
+    /// <summary>
+    /// 特殊处理类似 string.Format 的使用方法，防止注入，以及 IS NULL 转换
+    /// </summary>
+    /// <param name="that"></param>
+    /// <param name="args"></param>
+    /// <returns></returns>
+    public static string FormatDameng(this string that, params object[] args) => _damengAdo.Addslashes(that, args);
+    static FreeSql.Dameng.DamengAdo _damengAdo = new FreeSql.Dameng.DamengAdo();
+}

Providers/FreeSql.Provider.Dameng/DamengProvider.cs

@@ -0,0 +1,61 @@
+using FreeSql.Dameng.Curd;
+using FreeSql.Internal;
+using FreeSql.Internal.CommonProvider;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
+using System.Threading;
+
+namespace FreeSql.Dameng
+{
+
+    public class DamengProvider<TMark> : IFreeSql<TMark>
+    {
+
+        public ISelect<T1> Select<T1>() where T1 : class => new DamengSelect<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, null);
+        public ISelect<T1> Select<T1>(object dywhere) where T1 : class => new DamengSelect<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, dywhere);
+        public IInsert<T1> Insert<T1>() where T1 : class => new DamengInsert<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression);
+        public IInsert<T1> Insert<T1>(T1 source) where T1 : class => this.Insert<T1>().AppendData(source);
+        public IInsert<T1> Insert<T1>(T1[] source) where T1 : class => this.Insert<T1>().AppendData(source);
+        public IInsert<T1> Insert<T1>(List<T1> source) where T1 : class => this.Insert<T1>().AppendData(source);
+        public IInsert<T1> Insert<T1>(IEnumerable<T1> source) where T1 : class => this.Insert<T1>().AppendData(source);
+        public IUpdate<T1> Update<T1>() where T1 : class => new DamengUpdate<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, null);
+        public IUpdate<T1> Update<T1>(object dywhere) where T1 : class => new DamengUpdate<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, dywhere);
+        public IDelete<T1> Delete<T1>() where T1 : class => new DamengDelete<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, null);
+        public IDelete<T1> Delete<T1>(object dywhere) where T1 : class => new DamengDelete<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, dywhere);
+
+        public IAdo Ado { get; }
+        public IAop Aop { get; }
+        public ICodeFirst CodeFirst { get; }
+        public IDbFirst DbFirst { get; }
+        public DamengProvider(string masterConnectionString, string[] slaveConnectionString, Func<DbConnection> connectionFactory = null)
+        {
+            this.InternalCommonUtils = new DamengUtils(this);
+            this.InternalCommonExpression = new DamengExpression(this.InternalCommonUtils);
+
+            this.Ado = new DamengAdo(this.InternalCommonUtils, masterConnectionString, slaveConnectionString, connectionFactory);
+            this.Aop = new AopProvider();
+
+            this.DbFirst = new DamengDbFirst(this, this.InternalCommonUtils, this.InternalCommonExpression);
+            this.CodeFirst = new DamengCodeFirst(this, this.InternalCommonUtils, this.InternalCommonExpression);
+        }
+
+        internal CommonUtils InternalCommonUtils { get; }
+        internal CommonExpression InternalCommonExpression { get; }
+
+        public void Transaction(Action handler) => Ado.Transaction(handler);
+        public void Transaction(TimeSpan timeout, Action handler) => Ado.Transaction(timeout, handler);
+        public void Transaction(IsolationLevel isolationLevel, TimeSpan timeout, Action handler) => Ado.Transaction(isolationLevel, timeout, handler);
+
+        public GlobalFilter GlobalFilter { get; } = new GlobalFilter();
+
+        ~DamengProvider() => this.Dispose();
+        int _disposeCounter;
+        public void Dispose()
+        {
+            if (Interlocked.Increment(ref _disposeCounter) != 1) return;
+            (this.Ado as AdoProvider)?.Dispose();
+        }
+    }
+}

Providers/FreeSql.Provider.Dameng/DamengUtils.cs

@@ -0,0 +1,102 @@
+using Dm;
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+
+namespace FreeSql.Dameng
+{
+
+    class DamengUtils : CommonUtils
+    {
+        public DamengUtils(IFreeSql orm) : base(orm)
+        {
+        }
+
+        public override DbParameter AppendParamter(List<DbParameter> _params, string parameterName, ColumnInfo col, Type type, object value)
+        {
+            if (string.IsNullOrEmpty(parameterName)) parameterName = $"p_{_params?.Count}";
+            var dbtype = (DmDbType)_orm.CodeFirst.GetDbInfo(type)?.type;
+            switch (dbtype)
+            {
+                case DmDbType.Bit:
+                    if (value == null) value = null;
+                    else value = (bool)value == true ? 1 : 0;
+                    dbtype = DmDbType.Int32;
+                    break;
+               
+                case DmDbType.Char:
+                case DmDbType.VarChar:
+                case DmDbType.Text:
+                    value = string.Concat(value);
+                    break;
+            }
+            var ret = new DmParameter { ParameterName = QuoteParamterName(parameterName), DmSqlType = dbtype, Value = value };
+            _params?.Add(ret);
+            return ret;
+        }
+
+        public override DbParameter[] GetDbParamtersByObject(string sql, object obj) =>
+            Utils.GetDbParamtersByObject<DmParameter>(sql, obj, null, (name, type, value) =>
+            {
+                var dbtype = (DmDbType)_orm.CodeFirst.GetDbInfo(type)?.type;
+                switch (dbtype)
+                {
+                    case DmDbType.Bit:
+                        if (value == null) value = null;
+                        else value = (bool)value == true ? 1 : 0;
+                        dbtype = DmDbType.Int32;
+                        break;
+
+                    case DmDbType.Char:
+                    case DmDbType.VarChar:
+                    case DmDbType.Text:
+                        value = string.Concat(value);
+                        break;
+                }
+                var ret = new DmParameter { ParameterName = $":{name}", DmSqlType = dbtype, Value = value };
+                return ret;
+            });
+
+        public override string FormatSql(string sql, params object[] args) => sql?.FormatDameng(args);
+        public override string QuoteSqlName(params string[] name)
+        {
+            if (name.Length == 1)
+            {
+                var nametrim = name[0].Trim();
+                if (nametrim.StartsWith("(") && nametrim.EndsWith(")"))
+                    return nametrim; //原生SQL
+                if (nametrim.StartsWith("\"") && nametrim.EndsWith("\""))
+                    return nametrim;
+                return $"\"{nametrim.Replace(".", "\".\"")}\"";
+            }
+            return $"\"{string.Join("\".\"", name)}\"";
+        }
+        public override string TrimQuoteSqlName(string name)
+        {
+            var nametrim = name.Trim();
+            if (nametrim.StartsWith("(") && nametrim.EndsWith(")"))
+                return nametrim; //原生SQL
+            return $"{nametrim.Trim('"').Replace("\".\"", ".").Replace(".\"", ".")}";
+        }
+        public override string[] SplitTableName(string name) => GetSplitTableNames(name, '"', '"', 2);
+        public override string QuoteParamterName(string name) => $":{(_orm.CodeFirst.IsSyncStructureToLower ? name.ToLower() : name)}";
+        public override string IsNull(string sql, object value) => $"nvl({sql}, {value})";
+        public override string StringConcat(string[] objs, Type[] types) => $"{string.Join(" || ", objs)}";
+        public override string Mod(string left, string right, Type leftType, Type rightType) => $"mod({left}, {right})";
+        public override string Div(string left, string right, Type leftType, Type rightType) => $"trunc({left} / {right})";
+        public override string Now => "systimestamp";
+        public override string NowUtc => "getutcdate";
+
+        public override string QuoteWriteParamter(Type type, string paramterName) => paramterName;
+        public override string QuoteReadColumn(Type type, Type mapType, string columnName) => columnName;
+
+        public override string GetNoneParamaterSqlValue(List<DbParameter> specialParams, Type type, object value)
+        {
+            if (value == null) return "NULL";
+            if (type == typeof(byte[])) return $"hextoraw('{CommonUtils.BytesSqlRaw(value as byte[])}')";
+            return FormatSql("{0}", value, 1);
+        }
+    }
+}

Providers/FreeSql.Provider.Dameng/FreeSql.Provider.Dameng.csproj

@@ -0,0 +1,50 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>netstandard2.0;net45;net40</TargetFrameworks>
+    <Version>1.4.0-preview0414</Version>
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <Authors>YeXiangQin</Authors>
+    <Description>FreeSql 数据库实现，基于 达梦数据库 Ado.net (DmProvider)</Description>
+    <PackageProjectUrl>https://github.com/2881099/FreeSql</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/2881099/FreeSql</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <PackageTags>FreeSql;ORM;DM8;Dameng;达梦</PackageTags>
+    <PackageId>$(AssemblyName)</PackageId>
+    <PackageIcon>logo.png</PackageIcon>
+    <Title>$(AssemblyName)</Title>
+    <IsPackable>true</IsPackable>
+    <GenerateAssemblyInfo>true</GenerateAssemblyInfo>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="../../logo.png" Pack="true" PackagePath="\" />
+    <None Include="lib\DmProvider\netstandard2.0\DmProvider.dll" Pack="true" PackagePath="\lib\netstandard2.0\" />
+    <None Include="lib\DmProvider\net20\DmProvider.dll" Pack="true" PackagePath="\lib\net45\" />
+    <None Include="lib\DmProvider\net20\DmProvider.dll" Pack="true" PackagePath="\lib\net40\" />
+    <None Include="lib/**/*.dll">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\FreeSql\FreeSql.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Reference Include="DmProvider">
+      <HintPath>lib\DmProvider\netstandard2.0\DmProvider.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+  </ItemGroup>
+
+  <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
+    <DefineConstants>ns20;netstandard20</DefineConstants>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(TargetFramework)' == 'net40'">
+    <DefineConstants>net40</DefineConstants>
+  </PropertyGroup>
+  
+</Project>
+  

Providers/FreeSql.Provider.Dameng/lib/DmProvider/DmProvider.1.1.0.nuspec

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
+  <metadata>
+    <id>DmProvider</id>
+    <version>1.1.0</version>
+    <authors>DM</authors>
+    <owners>DM</owners>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>DM .NET PROVIDER</description>
+    <copyright>Copy right(C) DM</copyright>
+    <dependencies>
+      <group targetFramework=".NETFramework2.0" />
+      <group targetFramework=".NETStandard2.0">
+        <dependency id="System.Text.Encoding.CodePages" version="4.4.0" exclude="Build,Analyzers" />
+      </group>
+    </dependencies>
+    <frameworkAssemblies>
+      <frameworkAssembly assemblyName="System.Transactions" targetFramework=".NETFramework2.0" />
+    </frameworkAssemblies>
+  </metadata>
+</package>

Providers/FreeSql.Provider.Odbc/Dameng/Curd/OdbcDamengSelect.cs

@@ -125,60 +125,60 @@ namespace FreeSql.Odbc.Dameng
         }
 
         public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
-        public override ISelect<T1, T2> From<T2>(Expression<Func<ISelectFromExpression<T1>, T2, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2> From<T2>(Expression<Func<ISelectFromExpression<T1>, T2, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3> From<T2, T3>(Expression<Func<ISelectFromExpression<T1>, T2, T3, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3> From<T2, T3>(Expression<Func<ISelectFromExpression<T1>, T2, T3, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3, T4> From<T2, T3, T4>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3, T4>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4> From<T2, T3, T4>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3, T4>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3, T4, T5> From<T2, T3, T4, T5>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3, T4, T5>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5> From<T2, T3, T4, T5>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3, T4, T5>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3, T4, T5, T6> From<T2, T3, T4, T5, T6>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3, T4, T5, T6>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6> From<T2, T3, T4, T5, T6>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3, T4, T5, T6>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3, T4, T5, T6, T7> From<T2, T3, T4, T5, T6, T7>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7> From<T2, T3, T4, T5, T6, T7>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8> From<T2, T3, T4, T5, T6, T7, T8>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7, T8>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8> From<T2, T3, T4, T5, T6, T7, T8>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7, T8>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> From<T2, T3, T4, T5, T6, T7, T8, T9>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> From<T2, T3, T4, T5, T6, T7, T8, T9>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
-        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> From<T2, T3, T4, T5, T6, T7, T8, T9, T10>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
+        public override ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> From<T2, T3, T4, T5, T6, T7, T8, T9, T10>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp); var ret = new OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(_orm, _commonUtils, _commonExpression, null); OdbcDamengSelect<T1>.CopyData(this, ret, exp?.Parameters); return ret; }
         public override string ToSql(string field = null) => ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2> : FreeSql.Internal.CommonProvider.Select2Provider<T1, T2> where T1 : class where T2 : class
+    class OdbcDamengSelect<T1, T2> : FreeSql.Internal.CommonProvider.Select2Provider<T1, T2> where T1 : class where T2 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3> : FreeSql.Internal.CommonProvider.Select3Provider<T1, T2, T3> where T1 : class where T2 : class where T3 : class
+    class OdbcDamengSelect<T1, T2, T3> : FreeSql.Internal.CommonProvider.Select3Provider<T1, T2, T3> where T1 : class where T2 : class where T3 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3, T4> : FreeSql.Internal.CommonProvider.Select4Provider<T1, T2, T3, T4> where T1 : class where T2 : class where T3 : class where T4 : class
+    class OdbcDamengSelect<T1, T2, T3, T4> : FreeSql.Internal.CommonProvider.Select4Provider<T1, T2, T3, T4> where T1 : class where T2 : class where T3 : class where T4 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3, T4, T5> : FreeSql.Internal.CommonProvider.Select5Provider<T1, T2, T3, T4, T5> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class
+    class OdbcDamengSelect<T1, T2, T3, T4, T5> : FreeSql.Internal.CommonProvider.Select5Provider<T1, T2, T3, T4, T5> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3, T4, T5, T6> : FreeSql.Internal.CommonProvider.Select6Provider<T1, T2, T3, T4, T5, T6> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class
+    class OdbcDamengSelect<T1, T2, T3, T4, T5, T6> : FreeSql.Internal.CommonProvider.Select6Provider<T1, T2, T3, T4, T5, T6> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7> : FreeSql.Internal.CommonProvider.Select7Provider<T1, T2, T3, T4, T5, T6, T7> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class
+    class OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7> : FreeSql.Internal.CommonProvider.Select7Provider<T1, T2, T3, T4, T5, T6, T7> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7, T8> : FreeSql.Internal.CommonProvider.Select8Provider<T1, T2, T3, T4, T5, T6, T7, T8> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class
+    class OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7, T8> : FreeSql.Internal.CommonProvider.Select8Provider<T1, T2, T3, T4, T5, T6, T7, T8> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> : FreeSql.Internal.CommonProvider.Select9Provider<T1, T2, T3, T4, T5, T6, T7, T8, T9> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class
+    class OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> : FreeSql.Internal.CommonProvider.Select9Provider<T1, T2, T3, T4, T5, T6, T7, T8, T9> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
-    class OdbcOracleSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> : FreeSql.Internal.CommonProvider.Select10Provider<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class
+    class OdbcDamengSelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> : FreeSql.Internal.CommonProvider.Select10Provider<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> where T1 : class where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class
     {
-        public OdbcOracleSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
+        public OdbcDamengSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
         public override string ToSql(string field = null) => OdbcDamengSelect<T1>.ToSqlStatic(_commonUtils, _commonExpression, _select, _distinct, field ?? this.GetAllFieldExpressionTreeLevel2().Field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, this.GetTableRuleUnions(), _aliasRule, _tosqlAppendContent, _whereCascadeExpression, _orm);
     }
 }

Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengAdo/OdbcDamengConnectionPool.cs

@@ -25,7 +25,7 @@ namespace FreeSql.Odbc.Dameng
 
             this.availableHandler = availableHandler;
             this.unavailableHandler = unavailableHandler;
-            var policy = new OdbcOracleConnectionPoolPolicy
+            var policy = new OdbcDamengConnectionPoolPolicy
             {
                 _pool = this,
                 Name = name
@@ -62,7 +62,7 @@ namespace FreeSql.Odbc.Dameng
         }
     }
 
-    class OdbcOracleConnectionPoolPolicy : IPolicy<DbConnection>
+    class OdbcDamengConnectionPoolPolicy : IPolicy<DbConnection>
     {
 
         internal OdbcDamengConnectionPool _pool;

Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengCodeFirst.cs

@@ -114,7 +114,7 @@ namespace FreeSql.Odbc.Dameng
                 //codefirst 不支持表名中带 .
 
                 if (string.Compare(tbname[0], userId) != 0 && _orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(" select 1 from sys.dba_users where username={0}", tbname[0])) == null) //创建数据库
-                    throw new NotImplementedException($"Oracle CodeFirst 不支持代码创建 tablespace 与 schemas {tbname[0]}");
+                    throw new NotImplementedException($"达梦 CodeFirst 不支持代码创建 tablespace 与 schemas {tbname[0]}");
 
                 var sbalter = new StringBuilder();
                 var istmpatler = false; //创建临时表，导入数据，删除旧表，修改
@@ -200,7 +200,7 @@ where a.owner={{0}} and a.table_name={{1}}", tboldname ?? tbname);
                 var ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
                 var tbstruct = ds.ToDictionary(a => string.Concat(a[0]), a =>
                 {
-                    var sqlType = GetOracleSqlTypeFullName(a);
+                    var sqlType = GetDamengSqlTypeFullName(a);
                     return new
                     {
                         column = string.Concat(a[0]),
@@ -436,7 +436,7 @@ and not exists(select 1 from all_constraints where index_name = a.index_name and
             return sb.Length == 0 ? null : sb.Insert(0, "BEGIN \r\n").Insert(0, sbDeclare.ToString()).Append("END;").ToString();
         }
 
-        internal static string GetOracleSqlTypeFullName(object[] row)
+        internal static string GetDamengSqlTypeFullName(object[] row)
         {
             var a = row;
             var sqlType = string.Concat(a[1]).ToUpper();

Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengDbFirst.cs

@@ -61,7 +61,7 @@ namespace FreeSql.Odbc.Dameng
                     _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(1)"]);
                     return OdbcType.Bit;
                 case "smallint":
-                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(5)"]);
+                    _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(4)"]);
                     return OdbcType.SmallInt;
                 case "byte":
                     _dicDbToCs.TryAdd(dbfull, _dicDbToCs["number(3)"]);
@@ -323,7 +323,7 @@ where a.owner in ({1}) and {0}
                 ds2item[0] = row[0];
                 ds2item[1] = row[1];
                 ds2item[2] = Regex.Replace(string.Concat(row[2]), @"\(\d+\)", "");
-                ds2item[4] = OdbcDamengCodeFirst.GetOracleSqlTypeFullName(new object[] { row[1], row[2], row[3], row[4], row[5], row[6] });
+                ds2item[4] = OdbcDamengCodeFirst.GetDamengSqlTypeFullName(new object[] { row[1], row[2], row[3], row[4], row[5], row[6] });
                 ds2item[5] = string.Concat(row[7]) == "1";
                 ds2item[6] = string.Concat(row[8]) == "1";
                 ds2item[7] = string.Concat(row[9]);

Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengProvider.cs

@@ -38,12 +38,6 @@ namespace FreeSql.Odbc.Dameng
 
             this.DbFirst = new OdbcDamengDbFirst(this, this.InternalCommonUtils, this.InternalCommonExpression);
             this.CodeFirst = new OdbcDamengCodeFirst(this, this.InternalCommonUtils, this.InternalCommonExpression);
-
-            //this.Aop.AuditValue += new EventHandler<Aop.AuditValueEventArgs>((_, e) =>
-            //{
-            //    if (e.Value == null && e.Column.Attribute.IsPrimary == false && e.Column.Attribute.IsIdentity == false)
-            //        e.Value = Utils.GetDataReaderValue(e.Property.PropertyType.NullableTypeOrThis(), e.Column.Attribute.DbDefautValue);
-            //});
         }
 
         internal CommonUtils InternalCommonUtils { get; }

Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengUtils.cs

@@ -65,7 +65,7 @@ namespace FreeSql.Odbc.Dameng
                 return ret;
             });
 
-        public override string FormatSql(string sql, params object[] args) => sql?.FormatOdbcOracle(args);
+        public override string FormatSql(string sql, params object[] args) => sql?.FormatOdbcDameng(args);
         public override string QuoteSqlName(params string[] name)
         {
             if (name.Length == 1)