Doctrine createNativeQuery returns no results

Question

tl;dr

I have a working SQL query which returns rows from the SQL commandline, but not when submitted through Doctrine. I think the problem is in how I'm setting the ResultSetMapper. I've read the docs about native queries but I must be missing something. What is it?

Details

query

The following query run from the SQL commandline produces 1 row:

SELECT t.*
FROM 
  StateLogItem s NATURAL JOIN (
    SELECT 
      task_id, 
      MAX(
        COALESCE(updatedAt, createdAt)
      ) d, 
      MAX(id) id 
    FROM 
      StateLogItem 
    WHERE 
      dtype = 'transitionlogitem' 
    GROUP BY 
      task_id
  ) m 
  RIGHT JOIN Task t ON t.id = s.task_id 
WHERE  s.toState = 'started';

results:

'20', 1, NULL, 'just because', '2014-07-18 10:49:00', NULL

using ResultSetMapping

When I attempt to run the same query via Doctrine in a Symfony EntityRepository (as follows), I get zero rows even though the Symfony profiler indicates that the correct query was successfully run.

public function findByActionStatus($status){
    $sql = "SELECT t.id, t.description, t.created_by, t.updated_by, t.createdAt, t.updatedAt
            FROM StateLogItem s
                NATURAL JOIN (
                    SELECT task_id, MAX(COALESCE(updatedAt,createdAt)) d, MAX(id) id
                    FROM StateLogItem
                    WHERE dtype = 'transitionlogitem'
                    GROUP BY task_id
                ) m
                RIGHT JOIN Task t ON t.id=s.task_id
            WHERE s.toState = :status";

    $em = $this->getEntityManager();

    $rsm = new ResultSetMapping();
    $rsm->addEntityResult('ACCQueueBundle:Task', 't');
    $rsm->addFieldResult('t','t.id','id');
    $rsm->addFieldResult('t','t.created_by','createdBy');
    $rsm->addFieldResult('t','t.updated_by','updatedBy');
    $rsm->addFieldResult('t','t.description','description');
    $rsm->addFieldResult('t','t.createdAt','createdAt');
    $rsm->addFieldResult('t','t.updatedAt','updatedAt');

    $rsm->addJoinedEntityResult('ACCQueueBundle:TransitionLogItem','s','t','transitions'); //tried with and without


    $query = $em->createNativeQuery($sql,$rsm);
    $query->setParameter('status', $status);

    return $query->getResult();

}

entity

The Task entity looks like this:

namespace ACC\QueueBundle\Entity;

use Doctrine\ORM\Mapping as ORM;


use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\Common\Collections\ArrayCollection;
use ACC\Traits\BlameableTrait;
use ACC\MainBundle\Entity\Traits\HasDocumentsTrait;
use Gedmo\Mapping\Annotation as Gedmo;
use Gedmo\Timestampable\Traits\TimestampableEntity;    


/**
 * Task
 * @ORM\Entity(repositoryClass="ACC\QueueBundle\Entity\TaskRepository")
 * @ORM\HasLifecycleCallbacks()
 *
 */
class Task {

    use HasDocumentsTrait;
    use BlameableTrait;
    use TimestampableEntity;

    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;


    /**
     * @var Transition
     *
     * @ORM\OneToMany(targetEntity = "TransitionLogItem", mappedBy = "task", orphanRemoval = true, cascade = {"persist"})
     * @ORM\OrderBy({"createdAt" = "ASC"})
     */
    protected $transitions;

    /**
     * @var Pause
     *
     * @ORM\OneToMany(targetEntity = "PauseLogItem", mappedBy = "task", orphanRemoval = true, cascade = {"persist"})
     * @ORM\OrderBy({"createdAt" = "ASC"})
     */
    protected $pauses;


    /**
     * @var string
     *
     * @ORM\Column(name="description", type="text")
     */
    protected $description;

    /**
     * @ORM\ManyToMany(targetEntity = "ACC\MainBundle\Entity\Document", cascade={"persist","remove"})
     * @ORM\JoinTable(name="Task_Document",
     *  joinColumns={@ORM\JoinColumn(name="task_id", referencedColumnName="id")},
     *  inverseJoinColumns={@ORM\JoinColumn(name="document_id", referencedColumnName="id", unique=true)})
     */
    protected $documents;

//etc.

specs:

• PHP 5.5.14
• Doctrine ORM 2.4.4
• Symfony 2.5.2
• symfony environment: dev
• 5.5.34-MariaDB-log

Answer 1

Well I found the problem. It is caused by ResultSetMapping not understanding the query field names I gave it because I included the table prefix. So I can either not include the table prefix,

i.e. change $rsm->addFieldResult('t','t.id','id'); to $rsm->addFieldResult('t','id','id');

or I can alias all the fields:

i.e. change SELECT t.id, t.description... to SELECT t.id AS t_id, t.description AS t_description...

Answer 2

In my case there was no result because in the SQL query I didn't selected the column "id" of the "main" entity (the one in the FROM clause).