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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Converters and composers
Converters and composers are used to perform the mapping operation between an entity attribute and one or more table columns:
A converter maps one attribute to one column. Many converters are provided to convert SQL data into Java types, but you can write your own as well. A converter is specified in the mapping editor and is used for simple mapping.
A composer maps one attribute (which can be a complex class) to multiple table columns. A composer is specified in the mapping editor and is used for complex mapping.
The mapping editor allows you to specify a “complex mapping” for a CMP field. When you use this option, you have to provide a composer class. You typically use this option for complex attributes, such as the ...
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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.