Add unit test

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

@@ -9,25 +9,62 @@ namespace OrmTest
     public partial class NewUnitTest
     {
         public static void Enum()
+        {
+            String();
+            Int();
+        }
+        private static void String()
+        {
+            var db = Db;
+
+            db.CurrentConnectionConfig.MoreSettings = new SqlSugar.ConnMoreSettings
+            {
+                TableEnumIsString = true
+            };
+
+            db.CodeFirst.InitTables<Unit00Z1string1>();
+            db.Insertable(new Unit00Z1string1() { type = UnitType.a, type2 = null }).ExecuteCommand();
+            var x = db.Queryable<Unit00Z1string1>().Select(it => new
+            {
+                x = it.type,
+                x2 = it.type2
+            }).ToList();
+
+            var x2 = db.Queryable<Unit00Z1string1>().ToList();
+            db.Updateable<Unit00Z1string1>().SetColumns(it => it.type2 == UnitType.b)
+                .Where(it => true).ExecuteCommand();
+            var x3 = db.Queryable<Unit00Z1string1>().ToList();
+            foreach (var item in x3)
+            {
+                item.type2 = null;
+            }
+            db.Updateable<Unit00Z1string1>(x3).WhereColumns(it => it.type).ExecuteCommand();
+            var x4 = db.Queryable<Unit00Z1string1>().ToList();
+
+  
+        }
+        private static void Int()
         {
             Db.CodeFirst.InitTables<Unit00Z11C12>();
             Db.Insertable(new Unit00Z11C12() { type = UnitType.a, type2 = null }).ExecuteCommand();
-            var x=Db.Queryable<Unit00Z11C12>().Select(it=>new {
-                x=it.type,
-                x2=it.type2
+            var x = Db.Queryable<Unit00Z11C12>().Select(it => new
+            {
+                x = it.type,
+                x2 = it.type2
             }).ToList();
 
             var x2 = Db.Queryable<Unit00Z11C12>().ToList();
             Db.Updateable<Unit00Z11C12>().SetColumns(it => it.type2 == UnitType.b)
-                .Where(it=>true).ExecuteCommand();
+                .Where(it => true).ExecuteCommand();
             var x3 = Db.Queryable<Unit00Z11C12>().ToList();
             foreach (var item in x3)
             {
                 item.type2 = null;
             }
-            Db.Updateable<Unit00Z11C12>(x3).WhereColumns(it=>it.type).ExecuteCommand();
+            Db.Updateable<Unit00Z11C12>(x3).WhereColumns(it => it.type).ExecuteCommand();
             var x4 = Db.Queryable<Unit00Z11C12>().ToList();
         }
+
         public class Unit00Z11C12
         {
             [SqlSugar.SugarColumn(ColumnDataType = "int", IsNullable = false)]
@@ -35,6 +72,14 @@ namespace OrmTest
             [SqlSugar.SugarColumn(ColumnDataType ="int",IsNullable =true)]
             public UnitType? type2 { get; set; }
         }
+
+        public class Unit00Z1string1
+        {
+            [SqlSugar.SugarColumn(ColumnDataType = "varchar(50)", IsNullable = false)]
+            public UnitType type { get; set; }
+            [SqlSugar.SugarColumn(ColumnDataType = "varchar(50)", IsNullable = true)]
+            public UnitType? type2 { get; set; }
+        }
         public enum UnitType {
              a=-1,
              b=2,

Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/InsertableProvider.cs

@@ -650,6 +650,7 @@ namespace SqlSugar
                     if (this.Context.CurrentConnectionConfig.MoreSettings?.TableEnumIsString == true)
                     {
                         columnInfo.Value = columnInfo.Value.ToString();
+                        columnInfo.PropertyType = UtilConstants.StringType;
                     }
                     else
                     {

Src/Asp.Net/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs

@@ -574,6 +574,7 @@ namespace SqlSugar
                 {
                     if (this.Context.CurrentConnectionConfig.MoreSettings?.TableEnumIsString == true)
                     {
+                        columnInfo.PropertyType = UtilConstants.StringType;
                         columnInfo.Value = columnInfo.Value.ToString();
                     }
                     else