April 2003
Intermediate to advanced
750 pages
16h 53m
English
book
EJB 2.0 Development with WebSphere Studio Application Developer
by Ueli Wahli, Wouter Denayer, Lars Schunk, Deborah Shaddon, Martin Weiss
Content preview from EJB 2.0 Development with WebSphere Studio Application Developer
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Mapping strategies
Application Developer supports three mapping strategies for entity beans and relationships:
Top-down— From entity beans to new tables
Bottom-up— From existing tables to new entity beans
Meet-in-the-middle— Map entity beans to existing tables
Figure 12-1 summarizes the three approaches.
Figure 12-1. Mapping strategies for CMPs
In the sections that follow, we look at the three strategies in detail.
Top-down
The top-down approach is the easiest to handle, because no legacy database is imposed on you (Figure 12-2). You have full freedom to design the entity beans.
Figure 12-2. EJB mapping: top-down approach
The top-down approach ...
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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.