Error when use custom DQL function with Doctrine and Symfony2

Question

I use Symfony 2 and the ORM Doctrine. I want to create and register a custom DQL function. In fact, I want to use the SQL function \"CAST\" in my request, like this :

Answer 1

Can't find the reference but functions are not allowed in the order by clause. You need to cast your value in the select statement then sort by it.

Something like:

$qb->select('d, CAST(d.myField AS UNSIGNED) AS sortx)
   ->from('\Test\MyBundle\Entity\MyEntity', 'd')
   ->orderBy('sortx, 'ASC')

That is assuming your CAST function is written correctly.