使用查询生成器删除Doctrine 2 [英] Doctrine 2 delete with query builder

问题描述

我有两个关系为OneToMany的实体，分别为Project和Services.现在，我想通过project_id删除所有服务.

I have two Entities with relation OneToMany, Project and Services. Now i want to remove all the services by project_id.

第一次尝试:

$qb = $em->createQueryBuilder();
$qb->delete('Services','s');
$qb->andWhere($qb->expr()->eq('s.project_id', ':id'));
$qb->setParameter(':id',$project->getId());

此尝试失败，并出现异常Entity Service does not have property project_id.的确，该属性不存在，它仅在数据库表中作为外键.

This attempt fails with the Exception Entity Service does not have property project_id. And it's true, that property does not exists, it's only in database table as foreign key.

第二次尝试:

$qb = $em->createQueryBuilder();
$qb->delete('Services','s')->innerJoin('s.project','p');
$qb->andWhere($qb->expr()->eq('p.id', ':id'));
$qb->setParameter(':id',$project->getId());

这也产生了一个无效的DQL查询.

This one generetate a non valid DQL query too.

任何想法和例子都将受到欢迎.

Any ideas and examples will be welcome.

推荐答案

您正在使用DQL，而不是SQL，因此请不要在您的条件下引用ID，而应引用对象.

You're working with DQL, not SQL, so don't reference the IDs in your condition, reference the object instead.

因此，您的第一个示例将更改为:

So your first example would be altered to:

$qb = $em->createQueryBuilder();
$qb->delete('Services', 's');
$qb->where('s.project = :project');
$qb->setParameter('project', $project);

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