protected function _getIdColumnName()
        {
            if (!is_null($this->_instance_id_column)) {
                return $this->_instance_id_column;
            }

            if (isset(self::$_config[$this->_connection_name]['id_column_overrides'][$this->_table_name])) {
                return self::$_config[$this->_connection_name]['id_column_overrides'][$this->_table_name];
            }

            return self::$_config[$this->_connection_name]['id_column'];
        }