March 2007
Intermediate to advanced
712 pages
21h 53m
English
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Chapter 9. Manipulating entities with EntityManager
This chapter covers
- Persistence context and its scope
- Container- and application-managed entity managers
- Entity lifecycle and CRUD operations
- Detachment and merge operations
- Entity lifecycle listeners
In chapter 7 you learned how to develop the application domain model using JPA. In chapter 8 you saw how domain objects and relationships are mapped to the database. While the ORM annotations we explored in chapter 8 indicate how an entity is persisted, the annotations don’t do the actual persisting. This is performed by applications using the EntityManager interface, the topic of this chapter.
To use an analogy, the domain model annotated with ORM configuration is like a children’s toy ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.