Add demo

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

@@ -33,6 +33,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            Unitysadfay2.Init();
             Unitdfaatsd2.Init();
             Unityadfasasdfa.Init();
             Unitsdfaafa.Init();

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/Unitysadfay2.cs

@@ -0,0 +1,51 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    internal class Unitysadfay2
+    {
+        public static void Init() 
+        {
+            var db = NewUnitTest.Db;
+            db.CodeFirst.InitTables<ClassA, ClassB>();
+            db.Updateable<ClassA>()
+   .InnerJoin<ClassB>((m, e) => m.EmpId == e.EmpId)
+   .Where((m,e)=>true)
+   .SetColumns((m, e) => new ClassA()
+   {
+       EndDate = SqlFunc.IIF(e.CourseModel.Equals("DATE"), 
+                                SqlFunc.ToDate(e.Deadline).Date,
+                                SqlFunc.DateAdd(m.StartDate
+                                    , e.Period ?? 0
+                                    , DateType.Day).Date)
+
+   })
+   .ExecuteCommand();
+        }
+    }
+    [SugarTable("UnitClasssdfy")]
+    public class ClassA
+    {
+        public string EmpId { get; set; }
+        public DateTime EndDate { get; set; }
+        public DateTime StartDate { get; set; }
+    }
+
+    [SugarTable("UnitClassBdfas2")]
+    public class ClassB
+    {
+        public string EmpId { get; set; }
+        public string CourseModel { get; set; }
+        public DateTime? Deadline { get; set; }
+        public int? Period { get; set; }
+    }
+
+
+
+   
+}