具有ManyToMany关系的Doctrine2中此SQL语句的DQL

Question

I've made this SQL query to get the data I need from DB and it works exactly as I want:

SELECT DISTINCT ofreg.nombre as oficina 
  FROM nomencladores.oficina_regional AS ofreg  
  LEFT JOIN negocio.solicitud_usuario_oficina_regional AS solusofreg
    ON (ofreg.id = solusofreg.oficina_regional_id)
  JOIN nomencladores.tipo_tramite tram
    ON (tram.id = solusofreg.tipo_tramite_id)
  WHERE (tram.id = 1);

Since my relation will not generates any extra field on the third table then I decide to go for proper annotations on my entities, take a look:

class TipoTramite
{
    use IdentifierAutogeneratedEntityTrait;
    use NamedEntityTrait;
    use ActiveEntityTrait;

    /**
     * @ORM\ManyToMany(targetEntity="AppBundle\Entity\OficinaRegional", inversedBy="tipoTramites", cascade={"persist"})
     * @ORM\JoinTable(name="negocio.solicitud_usuario_oficina_regional", schema="negocio",
     *      joinColumns={@ORM\JoinColumn(name="oficina_regional_id", referencedColumnName="id")},
     *      inverseJoinColumns={@ORM\JoinColumn(name="tipo_tramite_id", referencedColumnName="id")}
     * )
     */
    protected $oficinaRegionals;
}

class OficinaRegional
{
    use IdentifierAutogeneratedEntityTrait;
    use NamedEntityTrait;
    use ActiveEntityTrait;

    /**
     * @ORM\ManyToMany(targetEntity="AppBundle\Entity\TipoTramite", mappedBy="oficinaRegionals", cascade={"persist"})
     */
    protected $tipoTramites;
}

Having those entities and supposing they are right (correct me if I'm wrong) I need to write a DQL that satisfies the above SQL code, can any give me some help writing this DQL?

I always have do it having a intermediary entity but this case is totally new for me. As and addition I know a workaround on this and will be create a view at DB level and write a entity just for that view with not set method just the get methods since will be a read only entity but I don't know if is the right path to go and I really like to learn how to do it using ManyToMany (in my project I have a lot of relation of this type so for sure I'll need this help later in the near future).

UPDATE

Ok, I'll like to keep this my track on this problem and I was doing some tests but without any helpful result, here are my tries:

First approach

public function filtrarOficinaRegionalPorTramite($tramite)
{
    $qb = $this->getEntityManager()->createQueryBuilder();
    $qb
        ->select('ofr.nombre AS oficinaRegional, ttr.nombre as tipoTramite')
        ->from("AppBundle:OficinaRegional", "ofr")
        ->where("ofr.activo = :activo")
        ->leftJoin("AppBundle:TipoTramite", "ttr");

    $qb->setParameter('activo', TRUE);

    if ($tramite != NULL) {
        $qb->andWhere('ttr.id = :tramite');
        $qb->setParameter('tramite', $tramite);
    }

    echo $qb->getQuery()->getSQL();
    return $qb->getQuery()->getResult();
}

Didn't work since the result SQL from the previous code is this one:

SELECT n0_.nombre AS nombre0, n1_.nombre AS nombre1 
FROM nomencladores.oficina_regional n0_ 
LEFT JOIN nomencladores.tipo_tramite n1_ 
 ON (n0_.activo = ?) 

Second approach

public function filtrarOficinaRegionalPorTramite($tramite)
{
    $qb = $this->getEntityManager()->createQueryBuilder();
    $qb
        ->select('ofr.nombre AS oficinaRegional, ttr.nombre as tipoTramite')
        ->from("OficinaRegional ofr")
        ->where("ofr.activo = :activo")
        ->leftJoin('ofr.TipoTramite ttr');

    $qb->setParameter('tramite', $tramite);

    if ($tramite != NULL) {
        $qb->where('ttr.id = :tramite');
        $qb->setParameter('tramite', $tramite);
    }

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

But got this error:

Warning: Missing argument 2 for Doctrine\\ORM\\QueryBuilder::from(), called in /var/www/html/project.dev/src/AppBundle/Entity/Repository/RegionalOfficeRepository.php on line 25 and defined in /var/www/html/project.dev/vendor/doctrine/orm/lib/Doctrine/ORM/QueryBuilder.php line 721

Third approach

After pass a huge amount of time trying to get things working I'm still having issues but this time I'm closer to fix them. So, here is my latest shot, with this code:

public function filtrarOficinaRegionalPorTramite($tramite)
{
    $qb = $this->getEntityManager()->createQueryBuilder();
    $qb
        ->select('ofr.nombre AS oficinaRegional, ttr.nombre as tipoTramite')
        ->distinct()
        ->from("AppBundle:OficinaRegional", "ofr")
        ->where("ofr.activo = :activo")
        ->leftJoin("ofr.tipoTramites", "ttr");

    $qb->setParameter("tramite", $tramite);

    if ($tramite != NULL) {
        $qb->andWhere("ttr.id = :tramite");
        $qb->setParameter("tramite", $tramite);
    }

    echo $qb->getQuery()->getSQL();
    return $qb->getQuery()->getResult();
}

I got this SQL:

SELECT DISTINCT n0_.nombre AS nombre0,
                n1_.nombre AS nombre1
FROM nomencladores.oficina_regional n0_
  LEFT JOIN negocio.solicitud_usuario_oficina_regional n2_ ON n0_.id = n2_.tipo_tramite_id
  LEFT JOIN nomencladores.tipo_tramite n1_ ON n1_.id = n2_.oficina_regional_id
WHERE n0_.activo = ?
      AND n1_.id = ?;

Which is not wrong at all, but this is how the final SQL should be:

SELECT DISTINCT n0_.nombre AS nombre0,
                n1_.nombre AS nombre1
FROM nomencladores.oficina_regional n0_
  LEFT JOIN negocio.solicitud_usuario_oficina_regional n2_ ON n0_.id = n2_.oficina_regional_id
  LEFT JOIN nomencladores.tipo_tramite n1_ ON n1_.id = n2_.tipo_tramite_id
WHERE n0_.activo = TRUE
      AND n1_.id = 1;

What I'm doing wrong?

Answer 1

It looks like your join column mappings are incorrect for TipoTramite, try flipping them around.

 /**
 * @ORM\ManyToMany(targetEntity="AppBundle\Entity\OficinaRegional", inversedBy="tipoTramites", cascade={"persist"})
 * @ORM\JoinTable(name="negocio.solicitud_usuario_oficina_regional", schema="negocio",
 *      joinColumns={@ORM\JoinColumn(name="tipo_tramite_id", referencedColumnName="id")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="oficina_regional_id", referencedColumnName="id")}
 * )
 */

http://doctrine-orm.readthedocs.org/en/latest/reference/association-mapping.html#one-to-many-unidirectional-with-join-table

As for the question marks, those are just parameters that will be filled in later.