在Symfony2中使用Doctrine DQL时检索的记录数量限制

I have the following query:

我有以下查询:

   $latestcontent = $em->createQuery('
            SELECT c.title, c.content, c.lastedit, a.firstname, a.surname
            FROM ShoutMainBundle:Content c, ShoutMainBundle:Admin a
            WHERE c.author = a.id
            ORDER BY c.lastedit ASC'
            );
   $lat