public static int Insert(Playlist playlist)
        {
            try
            {

                using (MySqlConnection conn = new MySqlConnection(App.setting.connectString))
                {
                    conn.Open();
                    string query = "p_insert_playlist";
                    using (MySqlCommand cmd = new MySqlCommand(query, conn))
                    {
                        cmd.Parameters.Add(new MySqlParameter("@_playlist_name", MySqlDbType.VarChar,100) { Direction = System.Data.ParameterDirection.Input, Value = playlist.Name });
                        cmd.Parameters.Add(new MySqlParameter("@_playlist_user", MySqlDbType.Int32) { Direction = System.Data.ParameterDirection.Input, Value = playlist.user_id });
                        cmd.Parameters.Add(new MySqlParameter("@_playlist_comment", MySqlDbType.VarChar, 100) { Direction = System.Data.ParameterDirection.Input, Value = playlist.Comment });
                        cmd.CommandType = System.Data.CommandType.StoredProcedure;
                        cmd.ExecuteScalar();
                    };
                    conn.Close();
                };
                return 1;
            }
            catch (MySqlException)
            {
                return -1;
            }
            catch (Exception)
            {
                return -2;
            }
        }
 public static Playlist toPlaylist(this MySqlDataReader reader)
 {
     if (reader.HasRows)
     {
         Playlist d = null;
         while (reader.Read())
         {
             if (!reader.IsDBNull(0))
             {
                 d = new Playlist();
                 d.ID = reader.GetInt32(Define.playlist_id);
                 d.Name = reader.GetString(Define.playlist_name);
                 d.Time = reader.GetDateTime(Define.playlist_datetime);
                 d.user_id = reader.GetInt32(Define.playlist_user);
                 d.Status = reader.GetBoolean(Define.playlist_status);
                 d.Default = reader.GetBoolean(Define.playlist_default);
                 try
                 {
                     d.Comment = reader.GetString(Define.playlist_comment);
                 }
                 catch (Exception)
                 {
                 }
             }
         }
         return d;
     }
     return null;
 }