March 2002
Intermediate to advanced
464 pages
8h 51m
English
book
Enterprise JavaBeans™ Component Architecture: Designing and Coding Enterprise Applications
by Gail Anderson, Paul Anderson
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6.1. Introducing Entity Beans
Our example entity bean models the customer data for the Music Collection shopping application. We'll delay describing it until after we've characterized entity beans in general.
An entity bean is an in-memory representation of persistent data. The persistence mechanism is either coded by the bean developer (bean-managed persistence) or provided by the container (container-managed persistence). For both bean-managed and container-managed entity beans, the EJB container manages life cycles and keeps the beans synchronized with the underlying database. Because multiple clients may share an entity bean (and possibly alter its state), the container and the bean developer must make sure that any updates occur within an ...
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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.