http://www.phpntips.com/mongodb-mysql-with-doctrine-2-example-of-listener-to-maintain-redundant-data-alternative-to-joins-2012-12/

Equivalent to the MySQL-Query: “SELECT COUNT(*) FROM users” in MongoDB ODM is: $count = $this->dm->createQueryBuilder(‘Documents\Functional\Users’)->getQuery()->execute()->count() http://stackoverflow.com/questions/10978242/mongodb-odm-select-count-equivalent