public function lastInsertId($table = null, $column = null)
    {
        $row = null;
        if ($column && $this->columnCount()) {
            $row = $this->fetch(static::FETCH_TYPE_ASSOC);
        }
        if (isset($row[$column])) {
            return $row[$column];
        }

        return $this->_driver->lastInsertId($table, $column);
    }