public final function addColumn(
        $name,
        $type,
        $length=null,
        $notnull=false,
        $default=null,
        $autoIncrement=false,
        $comment = null
    )
    {
        return $this->addColumnObject(
            $this->_database->createColumn(
                $name,
                $type,
                $length,
                $notnull,
                $default,
                $autoIncrement,
                $comment
            )
        );
    }