Subquery in doctrine2 notIN Function

问题:

I'd like to select members who are not in specific service. I have 3 tables :

• membre
• service
• membre_service (relation between membre and service)

I'm using doctrine 2 and in SQL my query is :

SELECT m.* FROM membre m WHERE m.`id` NOT IN (
    SELECT ms.membre_id FROM membre_service ms WHERE ms.service_id != 29
)

In Doctrine, I do :

$qb  = $this->_em->createQueryBuilder();
$qb2 = $qb;
$qb2->select('m.id')
        ->from('Custom\Entity\MembreService', 'ms')
        ->leftJoin('ms.membre', 'm')
        ->where('ms.id != ?1')
        ->setParameter(1, $service);

    $qb  = $this->_em->createQueryBuilder();
    $qb->select('m')
        ->from('Custom\Entity\Membre', 'm')
        ->where($qb->expr()->notIn('m.id', $qb2->getDQL())
    );
    $query  = $qb->getQuery();
    //$query->useResultCache(true, 1200, __FUNCTION__);

    return $query->getResult();

I got the following error :

Semantical Error] line 0, col 123 near 'm WHERE ms.id': Error: 'm' is already defined.

回答1:

The same alias cannot be defined 2 times in the same query

$qb  = $this->_em->createQueryBuilder();
$qb2 = $qb;
$qb2->select('m.id')
    ->from('Custom\Entity\MembreService', 'ms')
    ->leftJoin('ms.membre', 'm')
    ->where('ms.id != ?1');

$qb  = $this->_em->createQueryBuilder();
$qb->select('mm')
    ->from('Custom\Entity\Membre', 'mm')
    ->where($qb->expr()->notIn('mm.id', $qb2->getDQL())
);
$qb->setParameter(1, $service);
$query  = $qb->getQuery();

return $query->getResult();

Ideally you should use many-to-many relation for your entity, in this case your query is going to be much simpler.

回答2:

Actually if you are using the Symfony2 repository class you could also do the following:

$in = $this->getEntityManager()->getRepository('Custom:MembreService')
    ->createQueryBuilder('ms')
    ->select('identity(ms.m)')
    ->where(ms.id != ?1);

$q = $this->createQueryBuilder('m')
    ->where($q->expr()->notIn('m.id', $in->getDQL()))
    ->setParameter(1, $service);

return $q->getQuery()->execute();

回答3:

You can use (NOT) MEMBER OF:

<?php
$query = $em->createQuery('SELECT m.id FROM Custom\Entity\Membre WHERE :service NOT MEMBER OF m.services');
$query->setParameter('service', $service);
$ids = $query->getResult();

See the documentation for more examples.