Add demo

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/Main.cs

@@ -33,6 +33,8 @@ namespace OrmTest
         }
         public static void Init()
         {
+            Unitsadfasys.Init();
+            Unitsadfasys.Init();
             Unitadfasfysdfyss.Init();
             Unitsfasdyd.Init();
             Unitafdsafsss.Init();

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/Unitsadfasys.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    public class Unitsadfasys
+    {
+        public static void Init() 
+        {
+            var db = NewUnitTest.Db; 
+            var data=db.Deleteable(
+            new UnitDeletedsfsa() { A = "a" }
+            ).ToSql(); 
+            if (!data.Key.Contains("N'")) throw new Exception("unit error");
+
+            var data2 = db.Deleteable(
+             new UnitDeletedsfsa2() { A = "a" }
+            ).ToSql();
+            if (data2.Key.Contains("N'")) throw new Exception("unit error");
+        }
+        public class UnitDeletedsfsa 
+        {
+            [SqlSugar.SugarColumn(SqlParameterDbType =System.Data.DbType.String,IsPrimaryKey =true)]
+            public string A { get; set; }
+        }
+        public class UnitDeletedsfsa2
+        {
+            [SqlSugar.SugarColumn(IsPrimaryKey = true)]
+            public string A { get; set; }
+        }
+    }
+}