Symfony2 bad response from query with maxresults and firstresult - php

Question

I've meet a serious problem with setMaxResult and setFirstResult.
When i'm trying to get result without setMaxResults and setFirstResult, it works OK, all rows returned.
When i'm using offset = 0 and limit=10 , it works good, 10 rows returned.
When i'm using offset = 10 and limit = 10 , it return 5 rows (must be 7)
Another example, i've used offset = 0 , limit = 20 ,it returned 15 rows.But it must be 17 rows.
With offset=0 and limit = 30 , it returned all 17 rows .... Why this query works so bad ? With offset = 0 and limit 20, it should have returned all 17 rows... but not 15..
Code :
$eligibleCircles = $this->getAllCircles($user);
$results = $this->getEntityManager()
->createQuery(
'SELECT
e
FROM
TestBundle:Event e
LEFT JOIN
e.eligibleCircles eligibleCircles
WHERE
(
eligibleCircles in (:eligibleCircles)
OR
e.owner = :user
)
AND
e.eventStatus = :eventStatus
AND
NOT EXISTS (
SELECT
eh
FROM
TestBundle:EventHidden eh
WHERE
eh.user = :user
AND
eh.event = e
)
AND
e.startDate < :currentDate
ORDER BY e.startDate DESC
'
)
->setParameter('eventStatus', 3)
->setParameter('eligibleCircles', $eligibleCircles )
->setParameter('user', $user )
->setParameter('currentDate', new \DateTime('now') )
->setFirstResult($offset)
->setMaxResults($limitNr)
->getResult();

Answer 1

Cerad is correct with regard to the sql-limit not being useful when you have a join in your query.
If you want to paginate while using Doctrine2 there are some helpfull tools for you available.
Have a look at the documentation here:
http://doctrine-orm.readthedocs.org/en/latest/tutorials/pagination.html
You need a bit of extra code, but most of the complex stuff is handled for you.
It will also require 1 or 2 additional queries to find the correct records+data. This may or may not be a problem in your situation.