Update exp to sql

Src/Asp.Net/SqlServerTest/UnitTest/Updateable.cs

@@ -93,6 +93,14 @@ namespace OrmTest
             Db.Updateable<Order>()
              .SetColumns(it => new Order { Name = "a", CreateTime = DateTime.Now })
              .SetColumns(it => new Order() { Price = 1 }).Where(it => it.Id == 1).ExecuteCommand();
+ 
+            Db.Updateable<Order>()
+           .SetColumns(it => new Order { Name= it.Id>0  ?"1":"2", CreateTime = DateTime.Now })
+            .Where(it => it.Id == 1).ExecuteCommand();
+
+            Db.Updateable<Order>()
+           .SetColumns(it => new Order { Name = SqlFunc.IsNull(it.Name,"a")+"b", CreateTime = DateTime.Now })
+           .Where(it => it.Id == 1).ExecuteCommand();
 
             Db.CodeFirst.InitTables<Unitbluecopy>();
             Db.Insertable(new Unitbluecopy()).UseSqlServer().ExecuteBlueCopy();

Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MemberInitExpressionResolve.cs

@@ -154,6 +154,10 @@ namespace SqlSugar
                 else if (item is BinaryExpression)
                 {
                     var result = GetNewExpressionValue(item);
+                    if (result.HasValue())
+                    {
+                        result = result.Replace(",", UtilConstants.ReplaceCommaKey);
+                    }
                     this.Context.Result.Append(base.Context.GetEqString(memberName, result));
                 }
                 else if (item is MemberInitExpression)