Doctrine DBAL & ORM Bundle for the Symfony Framework.
Because Symfony 2 does not want to force or suggest a specific persistence solutions on the users this bundle was removed from the core of the Symfony 2 framework. Doctrine2 will still be a major player in the Symfony world and the bundle is maintained by developers in the Doctrine and Symfony communities.
IMPORTANT: This bundle is developed for Symfony 2.1 and up. For Symfony 2.0 applications the DoctrineBundle is still shipped with the core Symfony repository.
The Doctrine Project is the home of a selected set of PHP libraries primarily focused on providing persistence services and related functionality. Its prize projects are a Object Relational Mapper and the Database Abstraction Layer it is built on top of. You can read more about the projects below or view a list of all projects.
Object relational mapper (ORM) for PHP that sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernates HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.
DBAL is a powerful database abstraction layer with many features for database schema introspection, schema management and PDO abstraction.