How to write SQL query using Doctrine 2's NativeQuery with joins? - mysql

Question

I want to write a query that involves the use of 'UNION' (which is not supported by DQL) therefore I am trying to write a MySQL query using Doctrine 2's NativeQuery. I have been using Doctrine's documentation.
So far my code consists of:
$rsm = new ResultSetMapping();
$rsm->addEntityResult('\Entities\Query', 'q');
$rsm->addFieldResult('q', 'id', 'id');
$rsm->addFieldResult('q', 'title', 'title');
$rsm->addFieldResult('q', 'deadline', 'deadline');
$query = $this->_em->createNativeQuery('SELECT query.id, query.title, query.deadline FROM query', $rsm);
$aQuery = $query->getResult();
$aQuery = $query->getResult();
foreach($aQuery as $o){
echo '<p>';
echo 'id: '.$o->getId().'<br/>';
echo 'title: '.$o->getTitle().'<br/>';
echo 'deadline: '.$o->getDeadline()->getTimestamp().'<br/>';
echo '</p>';die;
}
This returns the expected results. However, I run into problems when I try to introduce a second table/entity in the query:
$rsm->addJoinedEntityResult('\Entities\Status', 's', 'q', 'status');
$rsm->addFieldResult('s', 'id', 'id', '\Entities\Status');
Those lines throw a: Notice: Undefined index: id message.I can't figure out why this is.
The query table has a 'status_id' column, which is a foreign key referring to the 'id' column of the 'status' table. In the query entity class I have mapped the status property as follows:
/**
* #var Status
*
* #ManyToOne(targetEntity="Status")
* #JoinColumns({
* #JoinColumn(name="status_id", referencedColumnName="id")
* })
*/
private $status;
Along with relevant get and set methods.
I have spent quite some time on trying to figure this out. Appreciate it if someone could shed some light on this.

Answer 1

You may write your query in any repository like below then you will get expected ans. In This way you use any SQL function of MySQL
public function yourFunction()
{
$em = $this->getEntityManager()->getConnection();
$sql = "YOUR DESIRE SQL"; // like SELECT * FROM users
try {
return $em->query($sql)->fetchAll();
} catch (\Doctrine\ORM\NoResultException $e) {
return null;
}
}