public void UpdateSetting (Setting setting)
		{
			if (IsQueryPossible) {
				_connection.Transaction (() => _connection.InsertOrReplace (setting));
			}
		}
		public void DeleteSetting (Setting setting)
		{
			if (IsQueryPossible) {
				_connection.Transaction (() => _connection.Delete<Setting> (setting.Key));
			}
		}
		public void AddSetting(Setting setting)
		{
			if (IsQueryPossible) {
				_connection.Transaction (() => _connection.Insert (setting));
			}
		}