使用 EXISTS 查询 Doctrine Symfony2 [英] Query with EXISTS for Doctrine Symfony2

问题描述

如何使用查询生成器实现以下查询?

How can I implement the following query with Query Builder?

SELECT * 
FROM t 
WHERE t.status = 1
    OR EXISTS(SELECT * 
              FROM r 
              WHERE r.t_id = t.id 
                  AND r.status = 1
             )

不存在检查的部分很简单，但是有没有办法实现EXISTS?

The part without exist check is easy, but is there a way to implement the EXISTS?

推荐答案

您要么需要使用两个查询构建器:

You either need to use two query builders:

$queryBuilder->expr()->exists($subQueryBuilder->getDql());

或直接使用 DQL:

$queryBuilder->expr()->exists('SELECT * 
    FROM r 
    WHERE r.t_id = t.id 
    AND r.status = 1'
);

您会在文档中找到更多示例:http://www.doctrine-project.org/projects/doctrine-orm/en/current/reference/query-builder.html

You'll find more examples in the docs: http://www.doctrine-project.org/projects/doctrine-orm/en/current/reference/query-builder.html

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