static string dataConnection = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;        static IDbConnection connection = new MySqlConnection(dataConnection);        public static string GetCode()        {            using (connection)            {
    　　　　　　　　　　//查询                string  code = connection.Query
     
      ($"SELECT orignal_code FROM `pack_code_oc` ").FirstOrDefault(); 　　　　　　　　　　//删除                connection.Execute($"delete   FROM `pack_code_oc` where orignal_code='{
     code}'");                return code;            }        }