$queryBuilder = $this->em->createQueryBuilder();
$query = $queryBuilder->update('models\User', 'u')
        ->set('u.username', ':userName')
        ->set('u.email', ':email')
        ->where('u.id = :editId')
        ->setParameter('userName', $userName)
        ->setParameter('email', $email)
        ->setParameter('editId', $editId)
        ->getQuery();
$result = $query->execute();

return $repository->createQueryBuilder('u')
            ->select('count(u.id)')
            ->getQuery()
            ->getSingleScalarResult();

Avec EntityManager()→createQuery('DQL')

        $query = $this->getEntityManager()->createQuery('UPDATE '.GDistributeur::class.' d SET d.assigned_series = (SELECT COUNT(s.id) FROM '.GSerie::class.' s WHERE s.gDistributeur = d.id)');              

• https://stackoverflow.com/questions/4337751/doctrine-2-update-query-with-query-builder
• https://www.wanadev.fr/56-comment-realiser-de-belles-requetes-sql-avec-doctrine/