Complex Query in Query Builder - php

Question

How can I execute this query using QueryBuilder in Symfony 2
SELECT um.id, sv.patentgroup_id, pm.portfolio_id, pp.id
FROM sv_patents sv
LEFT JOIN pm_patentgroups pm ON sv.patentgroup_id = pm.id
LEFT JOIN pm_portfolios pp ON pm.portfolio_id = pp.id
LEFT JOIN um_users um ON pp.user_id
The associations in entity classes are defined as
In SvPatents I have
/**
* #var PmPatentgroups
*
* #ORM\ManyToOne(targetEntity="PmPatentgroups")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="patentgroup_id", referencedColumnName="id")
* })
*/
private $patentgroup;
In PmPatentgroups I have
/**
* #var PmPortfolios
*
* #ORM\ManyToOne(targetEntity="PmPortfolios")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="portfolio_id", referencedColumnName="id")
* })
*/
private $portfolio_id;
In PmPortfolios I have
/**
* #var UmUsers
*
* #ORM\ManyToOne(targetEntity="UmUsers")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
* })
*/
private $user;
I tried this but it is giving me the whole results from the table looks like joins are not working propoerly
$repository = $this->getDoctrine()->getRepository('MunichInnovationGroupBundle:SvPatents');
$qb = $repository->createQueryBuilder('sv')
->leftJoin('sv.patentgroup','pm')
->leftJoin('pm.portfolio_id','pp')
->leftJoin('pp.user','um')
->getQuery();
$patents = $qb->getArrayResult();
I am quite new to Symfony2 and Doctorine2. I read the whole documentation but could not find such complex example actually i am bit confused with how the querybuilder build the query. It would be great if you explain it a little in simple words
Thanks in advance

Answer 1

I found the solution to my problem. If u looks for the records of a specific user in the table then you need to add one where clause. This is how your query should looks like
$user_id = 1;
$repository = $this->getDoctrine()->getRepository('MunichInnovationGroupBundle:SvPatents');
$qb = $repository->createQueryBuilder('sv')
->select('sv')
->leftJoin('sv.patentgroup','pm')
->leftJoin('pm.portfolio_id','pp')
->leftJoin('pp.user','um')
->where('pp.user = :user_id')
->setParameter('user_id', $user_id)
->getQuery();
$patents = $qb->getArrayResult();
Thats all :)

Answer 2

You're very close. You just have to add a ->select() query part:
$repository = $this->getDoctrine()->getRepository('MunichInnovationGroupBundle:SvPatents');
$qb = $repository->createQueryBuilder('sv')
->select('um.id, pm.id, pp.id') // add this part
->leftJoin('sv.patentgroup','pm')
->leftJoin('pm.portfolio_id','pp')
->leftJoin('pp.user','um')
->getQuery();
$patents = $qb->getArrayResult();