SQL, DQL, Query Builders and code for the "Query Like a Pro in Doctrine" series
Doctrine Object Relational Mapper (ORM)
Symfony Bundle for Doctrine ORM and DBAL
Symfony QueryFilterBundle that simplifies request filtering basing on different conditions (for Doctrine-based applications)
Specification based querying for Doctrine2
Query doctrine database from query string and provide HATEOAS responses.
Add JSON query support to Doctrine DBAL and DQL