Using JDO withJSP2
This tutorial will introduce the development process of a web based database application conforming to the J2EE standard.
I’ve posted an article on how to develop a JDO based database application on www.CSDN.net, however, it was a sim
Tutorial Details:
2.2 JDO specification and JDO Genie Implementation
JDO is the data object wrapper layer of our web application, and this is the core of the tutorial. To setup the JDO environment as quickly and simply as possible, we choose JDO Genie product as the implementation, provided by Hemisphere Technologies (whose headquarters are in South Africa). JDO Genie has some extra features that will improve and accelerate our development:
1. an integrated powerful workbench which can complete almost all of the configuration tasks for JDO development
2. support for many optional JDO features such as persistence capability of java.util.List, which is useful in this tutorial
3. automatic managed bi-directional relations. This is a key feature that may appear in JDO2.0 specification, and so far JDO Genie is the only implementation with this support
4. capability of integrating Ant. This enables the user to do Ant compilation and enhancement in the workbench without switching to the DOS window
5. support for semantically correct Collection.size() result for query result collections. Furthermore, it can be dynamically specified to use a “select count(*) …” in counting the total count for the qualified objects in a query without any performance penalty.
Let’s go to www.jdogenie.com and download the latest release: 2.2.0, a simple ZIP package. We simply unpack it into a directory, say C:\\, and we get a C:\\JDO Genie-2.2.0\\ directory. We’ll call this directory .
Since JDO Genie is not a free implementation, we need to get an evaluation license for our tutorial. Follow the instructions on the download webpage, and you will receive a JDO Genie.license” file in your mailbox. Note: you should save this file using an email client program, not a web based email application, because the browser will change some bytes in this file when saving it from the webpage. Many users have encountered such problems using web based email client like www.163.com .
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