Domain-Driven Design in PHP

With Doctrine

According to the Doctrine 2 ORM Documentation on locking support:

Doctrine 2 offers support for Pessimistic- and Optimistic-locking strategies natively. This allows to take very fine-grained control over what kind of locking is required for your Entities in your application.

According to the Doctrine 2 ORM Documentation on pessimistic locking:

Doctrine 2 supports Pessimistic Locking at the database level. No attempt is being made to implement pessimistic locking inside Doctrine, rather vendor-specific and ANSI-SQL commands are used to acquire row-level locks. Every Doctrine Entity can be part of a pessimistic lock, there is no special metadata required to use this feature.

However for Pessimistic Locking to work you have to ...