public function createColumn(
        $name,
        $type,
        $length=null,
        $notnull=false,
        $default=null,
        $autoIncrement=false,
        $comment=null
    )
    {
        $column = $this->createColumnObject();
        $column->constructNew($this, $name, $type, $length, $notnull, $default, $autoIncrement, $comment);
        return $column;
    }