Kohana Database Query Builder except() Method

Except.php

<?php

class Database_Query_Builder_Select extends Kohana_Database_Query_Builder_Select {
    
    public function except($ignore)
    {
        
        $ignore = func_get_args();
        
        if(count($this->_from) > 1)
            return;
        
        $result = DB::query(Database::SELECT, 'SHOW COLUMNS FROM ' . $this->_from[0])->execute()->as_array();
        foreach($result as $key => $value)
        {
            if( ! in_array($value['Field'], $ignore))
                $select[] = $value['Field'];
        }
        
        $this->_select = $select;
        
        return $this;
        
    }
    
}