Doctrine 2 / MySQL:无法将SQL左连接转换为DQL左连接

时间:2011-11-12 16:11:28

标签: php mysql doctrine-orm

因此,我的SQL的目标是获取Apartments及其中的一些信息。

这是SQL:

SELECT apartment.id, AVG(review.staff), COUNT(distinct review.id), city.name as city_name, state.state as state_name,
    MIN(room.price_per_night)
FROM room
    LEFT JOIN apartment ON room.apartment_id=apartment.id
    LEFT JOIN review ON room.apartment_id=review.apartment_id
    LEFT JOIN city ON apartment.city_id = city.id
    LEFT JOIN state ON city.city_state_id = state.id
GROUP BY apartment.id;

有效。

但是当我尝试将其转换为DQL时,一切顺利,直到我尝试加入评论表:

    $qb = $em->createQueryBuilder('c');

    $qb->select("MIN(r.price_per_night), rev.id")
       ->from("TechforgeApartmentBundle:Room", 'r')
       ->leftJoin('r.apartment', 'a')
       ->leftJoin('Review', 'rev', \Doctrine\ORM\Query\Expr\Join::WITH, 'r.apartment = rev.apartment')
       ->groupBy('a.id');

它总是抱怨在以前没有发现评论:

  

[语义错误]第0行,第116行附近' rev with r.apartment':错误:   在连接路径表达式中使用的标识变量检查但是   之前没有定义。

我尝试了很多,似乎没有任何帮助。

2 个答案:

答案 0 :(得分:2)

我很确定你可以放弃WITH条件,假设Apartment和Review有一个映射的关联。

$qb->select('MIN(r.price_per_night), rev.id')
   ->from('TechforgeApartmentBundle:Room', 'r')
   ->leftJoin('r.apartment', 'a')
   ->leftJoin('a.review', 'rev')
   ->groupBy('a.id');

如果由于某种原因你需要WITH条件,语法如下:

->leftJoin('a.review', 'rev', 'WITH', 'a.id = rev.apartment_id')

答案 1 :(得分:0)

我通过使用原始SQL查询解决了这个问题:

        $em = $this->getDoctrine()->getEntityManager();
        $stmt = $em->getConnection()
                   ->prepare("...
             ");
        $stmt->execute();