Symfony2 Doctrine查询

Question

我是symfony2的新手,我不知道如何使用createQuery()在symfony2中编写以下查询

select * from Post inner join Category on Post.category_id=Category.id inner join Priority on Post.priority_id=Priority.id order by priority_number desc

我使用了存储库类,在其中编写了一个函数

public function findAllOrderedByPriorityPost()
    {

        return $this->getEntityManager()
                ->createQuery('select p,c,pr from RodasysfourmBundle:Post p inner join 
RodasysfourmBundle:Category c  inner join RodasysfourmBundle:Priority pr order by pr.priorityNumber desc')
                ->getResult();
    }

当我使用这个功能时,我得到了以下错误

[Semantical Error] line 0, col 85 near 'c inner join': Error: Identification Variable RodasysfourmBundle:Category used in join path expression but was not defined before. 

另外哪种方法最好在自定义存储库或服务中使用此查询？

任何帮助赞赏.

Answer 1

如果指定引用实体的名称,doctrine2中的DQL将不知道如何连接表.您只能使用一个实体及其字段(可能有关系).

select p,c,pr from RodasysfourmBundle:Post p inner join 
p.Category c inner join c.Priority pr order by pr.priorityNumber desc