Synchronization code

Src/Asp.NetCore2/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs

@@ -269,6 +269,7 @@ namespace SqlSugar
                 .Where(it => it is SugarColumn)
                 .Select(it => (SugarColumn)it)
                 .FirstOrDefault();
+                column.ExtendedAttribute = sugarColumn.ExtendedAttribute;
                 column.DbTableName = result.DbTableName;
                 column.EntityName = result.EntityName;
                 column.PropertyName = property.Name;

Src/Asp.NetCore2/SqlSugar/Entities/EntityColumnInfo.cs

@@ -45,5 +45,6 @@ namespace SqlSugar
         public bool InsertServerTime { get;  set; }
         public bool UpdateServerTime { get; set; }
         public string UpdateSql { get; set; }
+        public object ExtendedAttribute { get;  set; }
     }
 }

Src/Asp.NetCore2/SqlSugar/Entities/Mapping/SugarMappingAttribute.cs

@@ -211,6 +211,7 @@ namespace SqlSugar
         public string InsertSql { get; set; }
         public bool UpdateServerTime { get; set; }
         public string UpdateSql { get; set; }
+        public object ExtendedAttribute{ get; set; }
     }