相关疑难解决方法(0)

我想做一个DQL查询,如:

$dql = "select p
        from AcmeDemoBundle:UserTypeA p 
        where p.UserTypeB = :id
        and (
                 select top 1 r.boolean
                 from AcmeDemoBundle:Registry r
             ) 
        = true";

但似乎TOP 1它不是doctrine2中的有效函数.

我无法弄清楚如何将子查询的结果限制为一行.

我正在尝试使用Doctrine进行子查询的查询.现在它给了我一个错误.我在存储库中的功能是:

public function getRecentPlaylists($count = 3) {


    $q = $this->_em->createQuery("
            SELECT p.id,
            p.featuredImage,
            p.title,
            p.slug,         
            a.firstName,
            a.lastName,
            a.slug as authorSlug,
            (SELECT updated 
                     FROM \Entities\Articles 
                     ORDER BY updated DESC LIMIT 1) as updated
            FROM \Entities\Playlist p
            JOIN \Entities\Account a
                        ON p.account_id = a.id
            ")
        ->setMaxResults($count);

            try{    
            return $q->getResult();
            }catch(Exception $e){
                echo $e->message();
            }

}

这给了我这个错误:

[Semantical Error] line 0, col 210 near 'LIMIT 1) as updated FROM': Error: Class 'LIMIT' is not defined.

我几乎放弃了Doctrine,我无法弄清楚如何使用子查询或带有子查询的联合进行查询.有什么帮助这个功能？谢谢!