symfony ORM 原则查询

Question

我可以通过内部连接轻松查询

$qb = $this->createQueryBuilder('r')
    ->innerJoin('UserBundle:User', 'u')
    ->where('r.nick = u.id')
    ->andWhere('r.odobera=:id')
    ->setParameter('id', $id)
    ->orderBy('r.time', 'DESC')
    ->setMaxResults(50);

return $qb->getQuery()->getResult();

应该是一个查询吧？但在探查器中我有

SELECT t0.username AS [...] FROM users t0 WHERE t0.id = ? LIMIT 1
Parameters: [1465] 
[Display runnable query]
Time: 1.79 ms [   Explain query ]
 SELECT r0_.id AS id0, [...] FROM requests r0_ INNER [...] ORDER BY r0_.time DESC LIMIT 50
Parameters: [1465] 
[Display runnable query]
Time: 0.67 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['2072'] 
[Display runnable query]
Time: 0.64 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['2386'] 
[Display runnable query]
Time: 0.50 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['79'] 
[Display runnable query]
Time: 0.50 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['2432'] 
[Display runnable query]
Time: 0.50 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['40'] 
[Display runnable query]
Time: 0.52 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['2090'] 
[Display runnable query]
Time: 0.46 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['1044'] 
[Display runnable query]
Time: 0.51 ms [   Explain query ]
 SELECT t0.username AS username1, [...] FROM users t0 WHERE t0.id = ?
Parameters: ['27'] 
[Display runnable query]
Time: 0.54 ms [   Explain query ]

对每条记录的每个“连接”进行一次查询...为什么？

PS：这篇文章只是为了让这篇文章更长，因为我不能提交“只是”这么多细节的问题..但我认为我的问题得到了很好的解释。顺便说一句：我问朋友，他有类似的问题）

Answer 1

您没有指定要选择什么，所以只是 requests 补水的地方。

您可以在查询生成器上使用select() 方法指定要补充的内容：

$qb = $this->createQueryBuilder('r')
     ->select(array('r', 'u'))
     ->innerJoin('UserBundle:User', 'u')
     ->where('r.nick = u.id')
     ->andWhere('r.odobera=:id')
     ->setParameter('id', $id)
     ->orderBy('r.time', 'DESC')
     ->setMaxResults(50);

return $qb->getQuery()->getResult();