155672af40
The strategy for composite primary keys must be "NONE" although the id generator class is \Doctrine\ORM\Id\AssignedGenerator. Calling the strategy "ASSIGNED" is misleading.
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Doctrine 2 is an object-relational mapper (ORM) for PHP 5.6+ that provides transparent persistence for PHP objects. It 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 Hibernate's HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.