Doctrine2 Symfony2 innerJoin QueryException预期的Doctrine\ORM\Query\Lexer :: T_WITH,得到'ON'

Question

作为我网站的一部分,我正在尝试使用Symfony2和Doctrine2创建标记(folksonomy)系统.

我正在按照下面的文档中的表和查询示例创建我的Doctrine实体:http://dablog.ulcc.ac.uk/wp-content/uploads/2007/12/tagging_folksonomy.pdf

当我尝试将MySQL查询(在文档中给出)转换为Doctrine Query Builder查询时,我得到了innerJoins的错误.示例如下:

来自文档的MySQL查询:

SELECT tag_text
, COUNT(*) as num_tags
FROM Tag2Post t2p
INNER JOIN Tags t
ON t2p.tag_id = t.tag_id
GROUP BY tag_text;

我的Doctrine Query Builder查询:

$qb = $em->createQueryBuilder()
          ->select('t.tag_text, COUNT(*) as num_tags')
          ->from('CompanyWebsiteBundle:Tag2Post', 't2p')
          ->innerJoin('CompanyWebsiteBundle:Tags', 't', 'ON', 't2p.tag_id = t.id')
          ->groupBy('t.tag_text')
;
$tags = $qb->getQuery()->getResult();

错误信息:

[2/2] QueryException: [Syntax Error] line 0, col 112: Error: Expected Doctrine\ORM\Query\Lexer::T_WITH, got 'ON'
[1/2] QueryException: SELECT t.tag_text, COUNT(*) as num_tags FROM CompanyWebsiteBundle:Tag2Post t2p INNER JOIN CompanyWebsiteBundle:Tag t ON t2p.tag_id = t.id GROUP BY t.tag_text

当我直接在数据库上运行MySQL查询时,它可以工作!

Answer 1

这应该工作.在DQL中,ON关键字替换为WITH.

$qb = $em->createQueryBuilder()
      ->select('t.tag_text, COUNT(*) as num_tags')
      ->from('CompanyWebsiteBundle:Tag2Post', 't2p')
      ->innerJoin('CompanyWebsiteBundle:Tags', 't', 'WITH', 't2p.tag_id = t.id')
      ->groupBy('t.tag_text')
;
$tags = $qb->getQuery()->getResult();

此外,如果您有正确配置的实体,您应该能够省略该, 'WITH', 't2p.tag_id = t.id'部分,因为学说应该自动找到关系.

例如:

$qb = $em->createQueryBuilder()
      ->select('t.tag_text, COUNT(*) as num_tags')
      ->from('CompanyWebsiteBundle:Tag2Post', 't2p')
      ->innerJoin('t2p.tags', 't')
      ->groupBy('t.tag_text')
;
$tags = $qb->getQuery()->getResult();