Symfony2 dottrina selezionare IFNULL

Question

Ok ho questo codice:

SELECT 
IFNULL(s2.id,s1.id) AS effectiveID, 
IFNULL(s2.status, s1.status) AS effectiveStatus, 
IFNULL(s2.user_id, s1.user_id) as effectiveUser, 
IFNULL(s2.likes_count, s1.likes_count) as effectiveLikesCount 

FROM statuses AS s1 
LEFT JOIN statuses AS s2 ON s2.id = s1.shared_from_id 
WHERE s1.user_id = 4310 
ORDER BY effectiveID DESC 
LIMIT 15 

e ho bisogno di riscrivere a QueryBuilder. Qualcosa del genere?

 $fields = array('IFNULL(s2.id,s1.id) AS effectiveID','IFNULL(s2.status, s1.status) AS effectiveStatus', 'IFNULL(s2.user_id, s1.user_id) as effectiveUser','IFNULL(s2.likes_count, s1.likes_count) as effectiveLikesCount'); 

    $qb=$this->_em->createQueryBuilder() 
      ->select($fields) 
      ->from('WallBundle:Status','s1') 
      ->addSelect('u') 
      ->where('s1.user = :user') 
      ->andWhere('s1.admin_status = false') 
      ->andWhere('s1.typ_statusu != :group') 
      ->setParameter('user', $user) 
      ->setParameter('group', 'group') 
      ->leftJoin('WallBundle:Status','s2', 'WITH', 's2.id=s1.shared_from_id') 
      ->innerJoin('s1.user', 'u')    
      ->orderBy('s1.time', 'DESC') 
      ->setMaxResults(15); 

    var_dump($query=$qb->getQuery()->getResult());die(); 

Questo errore è

[Syntax Error] line 0, col 7: Error: Expected known function, got 'IFNULL' 

Answer 1

Uso COALESCE anziché IFNULL simili

$fields = array('COALESCE(s2.id,s1.id) AS effectiveID','COALESCE(s2.status, s1.status) AS effectiveStatus', 'COALESCE(s2.user_id, s1.user_id) as effectiveUser','COALESCE(s2.likes_count, s1.likes_count) as effectiveLikesCount'); 

COALESCE restituisce il primo valore non nullo nell'elenco, quindi se A è nullo e B non nullo, quindi COALESCE(A,B) restituirà B.

Answer 2

C'è un'estensione di Doctrine che aggiunge questo tra gli altri.

Questo è il file DQL di IFNULL. https://github.com/beberlei/DoctrineExtensions/blob/master/src/Query/Mysql/IfNull.php

Questo capitolo spiega come vengono utilizzati. http://symfony.com/doc/2.0/cookbook/doctrine/custom_dql_functions.html