Synchronization code

Src/Asp.Net/SqlSugar/Realization/MySql/CodeFirst/MySqlCodeFirst.cs

@@ -92,6 +92,10 @@ namespace SqlSugar
             {
                 result.DataType = this.Context.Ado.DbBind.GetDbTypeName(item.Length > 9 ? UtilConstants.LongType.Name : UtilConstants.IntType.Name);
             }
+            else if (item.IsJson && item.DataType == null) 
+            {
+                result.DataType = "json";
+            }
             else
             {
                 var name = GetType(propertyType.Name);

Src/Asp.Net/SqlSugar/Realization/MySql/DbBind/MySqlDbBind.cs

@@ -25,7 +25,7 @@ namespace SqlSugar
             if (csharpTypeName == "DateTimeOffset")
                 csharpTypeName = "DateTime";
             var mappings = this.MappingTypes.Where(it => it.Value.ToString().Equals(csharpTypeName, StringComparison.CurrentCultureIgnoreCase));
-            return mappings.HasValue() ? mappings.First().Key : "varchar";
+            return (mappings?.Any()==true) ? mappings.First().Key : "varchar";
         }
         public override List<KeyValuePair<string, CSharpDataType>> MappingTypes
         {