diff --git a/FreeSql.DbContext/FreeSql.DbContext.xml b/FreeSql.DbContext/FreeSql.DbContext.xml
index 5ca74890..2acb6679 100644
--- a/FreeSql.DbContext/FreeSql.DbContext.xml
+++ b/FreeSql.DbContext/FreeSql.DbContext.xml
@@ -130,6 +130,13 @@
             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
@@ -520,5 +527,14 @@
             <param name="that"></param>
             <returns></returns>
         </member>
+        <member name="M:Microsoft.Extensions.DependencyInjection.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>
     </members>
 </doc>
diff --git a/FreeSql.Tests/FreeSql.Tests/UnitTest3.cs b/FreeSql.Tests/FreeSql.Tests/UnitTest3.cs
index ba54689f..d89e4db3 100644
--- a/FreeSql.Tests/FreeSql.Tests/UnitTest3.cs
+++ b/FreeSql.Tests/FreeSql.Tests/UnitTest3.cs
@@ -158,20 +158,30 @@ namespace FreeSql.Tests
 
         class testInsertNullable
         {
-            [Column(IsIdentity = true)]
+            [Column(IsNullable = false, IsIdentity = true)]
             public long Id { get; set; }
 
             [Column(IsNullable = false)]
             public string str1 { get; set; }
             [Column(IsNullable = false)]
             public int? int1 { get; set; }
+            [Column(IsNullable = true)]
+            public int int2 { get; set; }
         }
 
         [Fact]
         public void Test03()
         {
             g.sqlite.Insert(new testInsertNullable()).NoneParameter().ExecuteAffrows();
-
+            var ddlsql = g.sqlite.CodeFirst.GetComparisonDDLStatements(typeof(testInsertNullable), "tb123123");
+            Assert.Equal(@"CREATE TABLE IF NOT EXISTS ""main"".""tb123123"" (  
+  ""Id"" INTEGER PRIMARY KEY AUTOINCREMENT, 
+  ""str1"" NVARCHAR(255) NOT NULL, 
+  ""int1"" INTEGER NOT NULL, 
+  ""int2"" INTEGER 
+) 
+;
+", ddlsql);
 
             var sqlxx = g.pgsql.InsertOrUpdate<userinfo>().SetSource(new userinfo { userid = 10 }).UpdateColumns(a => new { a.birthday, a.CardNo }).ToSql();
 
diff --git a/FreeSql/Internal/UtilsExpressionTree.cs b/FreeSql/Internal/UtilsExpressionTree.cs
index 2b81e503..549cdac1 100644
--- a/FreeSql/Internal/UtilsExpressionTree.cs
+++ b/FreeSql/Internal/UtilsExpressionTree.cs
@@ -122,7 +122,7 @@ namespace FreeSql.Internal
                     colattr.DbType = colattr.DbType.ToUpper();
 
                 if (colattrIsNull == false && colattrIsNullable == true) colattr.DbType = colattr.DbType.Replace("NOT NULL", "");
-                if (colattrIsNull == false && colattrIsNullable == false) colattr.DbType = Regex.Replace(colattr.DbType, @"\bNULL\b", "").Trim() + " NOT NULL";
+                if (colattrIsNull == false && colattrIsNullable == false && colattr.DbType.Contains("NOT NULL") == false) colattr.DbType = Regex.Replace(colattr.DbType, @"\bNULL\b", "").Trim() + " NOT NULL";
                 if (colattr._IsNullable == null && tp != null && tp.isnullable == null) colattr.IsNullable = tp.dbtypeFull.Contains("NOT NULL") == false;
                 if (colattr.DbType?.Contains("NOT NULL") == true) colattr.IsNullable = false;
                 if (string.IsNullOrEmpty(colattr.Name)) colattr.Name = p.Name;