How to write a DQL select statement to search some, but not all the entities in a single table inheritance table - doctrine-orm

Question

So I have 3 entities within one table. I need to be able to search 2 out of the 3 entities in one select statement, but I'm not sure how to do this.

Answer 1

Use the INSTANCE OF operator in your dql query like this (where User is your base class):
$em->createQuery('
SELECT u
FROM Entity\User u
WHERE (u INSTANCE OF Entity\Manager OR u INSTANCE OF Entity\Customer)
');
Doctrine translates this in the sql query in a WHERE user.type = '...' condition.
See here for more details on the dql query syntax.

Answer 2

The answer for multiple instances actually doesn't work. You would have to do something like this to check for multiple instances.
$classes = ['Entity\Manager', 'Entity\Customer'];
$qb = $this->createQueryBuilder('u');
->where('u.id > 10') //an arbitrary condition, to show it can be combined with multiple instances tests
->andWhere("u INSTANCE OF ('" . implode("','", $classes) . "')");

Answer 3

As commented by flu, if you want to retrieve some entities from different instances with a QueryBuilder instead of a DQL query, you can use an array as parameter:
$qb = $this->createQueryBuilder('u');
->where('u.id > 10') //an arbitrary condition, to show it can be combined with multiple instances tests
->andWhere('u INSTANCE OF :classes')
->setParameter('classes', ['Entity\Manager', 'Entity\Customer'])
;