public function selectArrayIndexed($q, $args = array())
    {
        $this->exec($q, $args);
        if ($this->_sth) {
            $result = array();
            while ($row = $this->_sth->fetch(\PDO::FETCH_ASSOC)) {
                $result[$row[key($row)]] = $row;
            };
            return $result;
        } else {
            return false;
        };
    }