public function toArray()
    {
        return array(
            'name' => $this->_name,
            'type' => $this->_datatype,
            'length' => $this->_length,
            'notnull' => $this->_notnull,
            'default' => $this->_default,
            'autoincrement' => $this->_autoIncrement,
            'comment' => $this->_comment,
        );
    }