Symfony2教义查询

问题描述

我在symfony2中是新的，我不知道如何在symfony2中使用createQuery（）来编写下面的查询。

  select * from Post inner join类别Post.category_id = Category.id内部连接优先级Post.priority_id = Priority.id order by priority_number desc 
  

我使用了存储库类，其中写了一个函数

  public function findAllOrderedByPriorityPost（） 
 {
 
 return $ this-> getEntityManager（）
  - > createQuery（'select p，c，pr from RodasysfourmBundle：Post p inner join 
 RodasysfourmBundle ：class c inner join RodasysfourmBundle：pr prriorityNumber desc'的优先级顺序）
  - > getResult（）; 
} 
  

当我使用这个功能，我得到以下错误

  [语义错误]行0，col 85靠近'c inner join'：错误：标识变量RodasysfourmBundle：连接路径表达式中使用的类别，但不是之前定义。 
  

哪个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。

解决方案

doctrine2中的DQL不知道如何加入指定引用实体的名称的表。您只能使用一个实体及其字段（可能有关系）。

 从RodasysfourmBundle中选择p，c，pr： post p inner join 
 p.Category c inner join c.Priority pr order by pr.priorityNumber desc 
  

I'm new in symfony2 , I don't know how to write a below query in symfony2 using createQuery()

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

I used repository class,in which ,wrote a function

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();
    }

when I used this function,I got the below error

[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.

Also which method is best using this query in a custom repository or as a service?

any help appreciated.

解决方案

DQL in doctrine2 won't know how to join tables if you specify the name of a referenced entity. You can only work with one entity and its fields (which may have relations).

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

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