Doctrine 2: how do you use a subquery column (in the SELECT clause)

Question

I\'m trying to do a simple select query with a subquery in the SELECT clause and have simply not found a way to do it. I\'ve tried with both DQL and with the QueryBuilder, n

Answer 1

$query = $qb->select('a')
    ->addSelect('(SELECT at.addresstypeName
            FROM e:Addresstype at
            WHERE at.addresstypeId = a.addresstypeId) AS addresstypeName'
        )
    ->from('e:Address', 'a')
    ->where('a.addressId = :addressId')
    ->setParameter('addressId', 1);

Answer 2

I know this is an old question, but if you want, you could have used another query builder as your subquery:

 $qb->select("a")
            ->addSelect("(" . $qb2->select("at.addresstypeName")
                ->from("e:Addresstype", "at")
                ->where("at.addresstypeId = a.addresstypeId")
                ->getDQL() . ") AS addresstypeName"
            )
            ->from('e:Address', 'a')
            ->where('a.addressId = :addressId')
            ->setParameter('addressId', 1);

Answer 3

In my scenario what I needed was to look into a join and find an Id and use it as boolean, found 1 otherwise 0, then applying this to orderBy. DQL expressions worked only when combined with Where clause, which wasn't my case. So, a DQL subselect saved me.

Adapted more or less to your scenario, it would look like this:

// With QueryBuilder
// In AddressRepository
// Where one address may belong to several addressTypes

public function getWithType($addressType){

$qb = $this->createQueryBuilder('a1');
$qb->addSelect('a1.someField', 'a1.otherField')
$qb->addSelect(
        '(SELECT at.addressTypeName 
        FROM App\Entity\Address a2
        JOIN a2.addressType at
        WHERE at.id = '.$addressType.' AND a2.id = a1.id
        ) AS addressTypeName')
//The rest part of the query
        
}

Answer 4

For me subquery with doctrine works with this query :

$qb->select('e.field')
   ->addSelect('(SELECT count(mv.nm)
                FROM Clt\Bundle\MyBundle\Entity\MV mv
                LEFT JOIN Clt\Bundle\MyBundle\Entity\M ma WITH  mv.nm=ma.nm
                WHERE mv.ne=e.ne and ma.nm is null
                ) AS nm'
   )
   ->from($this->_entityName, 'e')
   ->leftJoin('e.m', 'm')
   ->where($qb->expr()->eq('t.id'.$typeModule, $idElementModule));

Note that in the left join you must use WITH instead of ON...