private function alter($key, $operator, $step)
    {
        $query = sprintf('UPDATE `%s` SET `value` = value %s %s WHERE `key` = :key', $this->table, $operator, $step);

        $stmt = $this->pdo->prepare($query);
        return $stmt->execute(array(
            ':key' => $key
        ));
    }
private function alter($key, $operator, $step)
    {
        $query = sprintf('UPDATE `%s` SET `value` = value %s %s WHERE `key` = :key', $this->table, $operator, $step);

        $stmt = $this->pdo->prepare($query);
        return $stmt->execute(array(
            ':key' => $key
        ));
    }
private function alter ( $ key , $ operator , $ step ) { $ query = sprintf ( 'UPDATE `%s` SET `value` = value %s %s WHERE `key` = :key' , $ this -> table , $ operator , $ step ) ; $ stmt = $ this -> pdo -> prepare ( $ query ) ; return $ stmt -> execute ( array ( ':key' => $ key ) ) ; }
Alters a column

@param string $key
@param string $operator
@param integer $step
@return boolean
Alters a column