Doctrine 2 where two associations exists query - sql

Question

I have two entities related, and I need a query that checks if entityOne have two different relations (extra column as diff field) to entityTwo.
A simple "WHERE entityTwo.diff_field = 1 AND entityTwo.diff_field = 2" don't work.
How can I achive this?
Thanks
UPDATE:
$query = $this->createQueryBuilder('one');
$query->addSelect('two')->leftJoin('one.two', 'two');
$query->where('two.id = :a')->setParameter('a',1);
$query->andWhere('two.id = :b')->setParameter('b',2);
EntityOne
class EntityOne {
/**
* #ORM\Id
* #ORM\Column(type="integer", nullable=false);
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\OneToMany(targetEntity="EntityTwo", mappedBy="one")
*/
protected $two;
}
EntityTwo
class EntityTwo {
/**
* #ORM\Id
* #ORM\Column(type="integer", nullable=false);
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\ManyToMany(targetEntity="EntityOne", inversedBy="two", cascade={"persist"})
* #ORM\JoinTable(name="one_two_xref")
*/
protected $one;
}

Answer 1

I think you need two EXISTS subqueries.
You want (I think) to select entityOnes which have
a linked entityTwo with diffType 1 and also a linked entityTwo with difftype 2.
If you scroll down to 'EXISTS in WHERE clause with correlated Subquery' in this documentation:
http://docs.doctrine-project.org/en/2.1/reference/dql-doctrine-query-language.html
I think what you need is a similar query but with two separate EXISTS subqueries, something like :
WHERE EXISTS (SELECT EntityTwo ... DiffType = 1)
AND EXISTS (SELECT EntityTwo ... DiffType = 2)