Symfony2 & Doctrine: Create custom SQL-Query

You can get the Connection object directly from the Entity Manager, and run SQL queries directly through that:

$em = $this->getDoctrine()->getManager(); // ...or getEntityManager() prior to Symfony 2.1
$connection = $em->getConnection();
$statement = $connection->prepare("SELECT something FROM somethingelse WHERE id = :id");
$statement->bindValue('id', 123);
$statement->execute();
$results = $statement->fetchAll();

However, I'd advise against this unless it's really necessary... Doctrine's DQL can handle almost any query you might need.

Official documentation: https://www.doctrine-project.org/projects/doctrine-dbal/en/2.9/reference/data-retrieval-and-manipulation.html