Which of Database:: I should use in Kohana 3.3?

Which of Database:: I should use in Kohana 3.3?

I need perform query "LOCK TABLE myTable WRITE"

<?php
$db = Database::instance();
$query = 'LOCK TABLE `myTable` WRITE';
$db->query(Database::WHAT_IS_THE_TYPE_SHOULD_SPECIFY_HERE_?, $query);