- 增加 达梦数据库 ODBC 适配，和单元测试，支持 CodeFirst 模式开发；

FreeSql.Tests/FreeSql.Tests.Provider.Odbc/Dameng/DamengAopTest.cs

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+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+using Xunit;
+
+namespace FreeSql.Tests.Odbc.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);
+        }
+    }
+}