doctrine-orm - Fetch records with ManyToMany relation in one query

Question

I have 2 entities, Picture and Tag, with ManyToMany relation. That means 3 tables: picture, tag and pictures_tags.

I want to select some pictures and join their tags in the same query. How can it be done in DQL?

Answer 1

查询相当简单，都是关于fetch-joins 的：

$picture = $em->createQuery(
    "SELECT p, t FROM Entity\Picture p JOIN p.tags t WHERE p.id = :pictureId"
)->getResult();

Answer 2

$query = $em->createQuery("Select * from pictures p 
join pictures_tags pt on p.pictureid=pt.pictureid 
join tag on tag.id=pt.tagid");
$users = $query->getResult();