Better to use DQL for getting Column Count or Get Collection Then Count?

I am quite sure that DQL will be t开发者_JAVA百科he way to go, but I am wondering if Doctrine, i am using Doctrine 2, has someway to return the row count. I won't be using the rows itself, I just want the count.

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I'm new to Doctrine2 but it looks like you can simply do this:

$query = $em->createQuery('SELECT COUNT(u.id) FROM Entities\User u');
$count = $query->getSingleScalarResult();

Source (Using Agregate Functions): http://www.doctrine-project.org/docs/orm/2.0/en/reference/dql-doctrine-query-language.html#dql-select-examples

Allowed aggregate functions: http://www.doctrine-project.org/docs/orm/2.0/en/reference/dql-doctrine-query-language.html#aggregate-functions

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Here is another interesting point of view about using aggregated functions in DQL

http://doctrine-orm.readthedocs.org/en/latest/cookbook/aggregate-fields.html

Maybe you would avoid the creation of an specific query to obtain an aggregate value. In this case, aggregate fields are a good alternative.