How to Join with Native SQL Query and doctrine - sql

Question

I'm developping an application with symfony 3.4. I want to execute a specific query. So i have two entities: the first is PrPurchaseRequest. the second is PrSpecificFieldValue. PrPurchaseRequest has oneToMany prSpecificFieldValues.
I want to get id of purchaseRequest and prSpecificFieldValues
i did that
$queryBuilder = $this->getEntityManager()->createQuery('select p.id as purchaseId, pr.keyField AS keyField,pr.ID AS prkeyvalueid from '.PrPurchaseRequest::class. ' p LEFT JOIN '. PrSpecificFieldValue::class .' spec ON p.id = spec.purchaseId ');
and that didn't work for me
[Syntax Error] Error: Expected end of string, got
'ON'
how can i do it

Answer 1

Using doctrine you need to play around your entities and their mappings with other entities in order to relate them like
use Doctrine\Common\Collections\ArrayCollection;
/** #Entity */
class PrPurchaseRequest
{
/**
*
* #OneToMany(targetEntity="PrSpecificFieldValue", mappedBy="prPurchaseRequest")
*/
private $prSpecificFieldValues;
// ...
public function __construct() {
$this->prSpecificFieldValues = new ArrayCollection();
}
}
/** #Entity */
class PrSpecificFieldValue
{
/**
*
* #ManyToOne(targetEntity="PrPurchaseRequest", inversedBy="prSpecificFieldValues")
* #JoinColumn(name="pr_purchase_request_id", referencedColumnName="id")
*/
private $prPurchaseRequest;
}
Now you have defined relationship between your entities you can join them based on their mapping (prSpecificFieldValues defined on PrPurchaseRequest class ) like
Its DQL (DQL != SQL)
SELECT p,v
FROM PrPurchaseRequest p
JOIN p.prSpecificFieldValues v
No need to specify ON clause doctrine will handle this for you.
One-To-Many, Bidirectional