doctrine2 - querybuilder, empty parameters

问题

what can i do if the parameter has no value?

my query:

$query = $this->_em->createQueryBuilder()
                   ->select('u')
                   ->from('Users', 'u')
                   ->where('u.id = ?1')                   
                   ->andWhere('u.status= ?2')
                   ->setParameter(1, $userid)
                   ->setParameter(2, $status)
                   ->getQuery();

return $query->getResult();

if theres no $status, then it doesnt display anything.

i tried putting a condition before the query to check if its null but what value can i set $status iif theres no status set

回答1:

The query builder is exactly there for building conditional queries. You could do:

$qb = $this->_em->createQueryBuilder();

$query = $qb->select('u')
            ->from('Users', 'u')
            ->where('u.id = ?1')                   
            ->setParameter(1, $userid);

if ($status) {
    $qb->andWhere('u.status = ?2')
       ->setParameter(2, $status);
}

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

On a side note, it is best practice to use named placeholders e. g. like this:

    $qb->andWhere('u.status = :status')
       ->setParameter('status', $status);

回答2:

You could write:

->andWhere('(u.status= ?2 or ?2 is null)')

来源：https://stackoverflow.com/questions/7389767/doctrine2-querybuilder-empty-parameters