How do I use LIMIT in a codeigniter/doctrine query? - doctrine-orm

Question

I am using CodeIgniter2 + Doctrine2, and have the following query:
$query = $this->doctrine->em->createQuery("
SELECT u
FROM ORM\Dynasties2\Characters u
WHERE u.fathersId = $key
AND u.deathDate IS NULL
AND u.isRuler = '0'
AND u.isFemale = '0'
AND u.useAI = '1'
AND u.bornDate <= $of_age
");
$sons_of_age = $query -> getResult();
And I only want to get ONE result, assuming there are any hits.
I've looked at Doctrine documentation about using ->LIMIT(1) but I have tried putting this into my query in various places, and only get errors.
Codeigniter has some functions builtin to do $query->row() but this does not seem to work - I wager because of the Doctrine integration.
Thanks!

Answer 1

You're looking for method Query::setMaxResults($number); Then you can use Query:getSingleResult();, but method Query:getSingleResult(); throws error if there's no record.
$query = $this->doctrine->em->createQuery("
SELECT u
FROM ORM\Dynasties2\Characters u
WHERE u.fathersId = $key
AND u.deathDate IS NULL
AND u.isRuler = '0'
AND u.isFemale = '0'
AND u.useAI = '1'
AND u.bornDate <= $of_age
");
$query->setMaxResults(1);
try {
$sons_of_age = $query->getSingleResult();
} catch (\Doctrine\ORM\NoResultException $e) {
$sons_of_age = null;
}