Callbacks and Listeners
Antonio Goncalves · Apress eBooks · 2010
In the previous chapter, you saw how to query mapped entities. Now you know how to persist, remove, update, and find an entity by its identifier. With JPQL, you can retrieve one or more entities according to certain search criteria with dynamic, static, and native queries. All these actions are carried out by the entity manager—the central piece that manipulates entities and manages their life cycle.