Doctrine createQueryBuilder() – EntityManager vs. EntityRepository

EntityRepository and EntityManager have slightly different versions of the createQueryBuilder() function. Whereas the EntityManager’s version takes no arguments, EntityRepository’s version expects an ‘$alias‘ parameter. What is going on?!

The EntityRepository class wraps the EntityManager’s call, as such:

From /lib/Doctrine/ORM/EntityRepository.php

The function’s phpdoc reveals the reasoning behind the parameter count differences, EntityRepository returnsĀ a version of createQueryBuilder() customised for itself. We no longer need to specify the primary table we’re selecting from. Instead we must supply an $alias parameter which would usually be later supplied to the from() function.

Also note the above means all columns are selected from the entity by default.

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