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OverviewTriActive JDO (TJDO) is an open source implementation of Sun's JDO specification (JSR 12), designed to support transparent persistence on most JDBC-compliant databases. TJDO has been deployed and running successfully in commercial installations since 2001. The current version has been tested successfully using Derby, DB2, Firebird, MySQL, Oracle, PostgreSQL, and MS SQL Server. Features
Design GoalsAs an O-R mapper TJDO falls under the category of schema generators, meaning it takes your user-written Java classes and, to the degree possible, fully automates the tasks required to transparently persist objects to a database. Although there are several ways to "tweak" the mapping strategy, for the most part the developer delegates these tasks to the JDO layer. Schema generators are best suited to projects whose persistent data model is being newly developed, or perhaps fully refactored, and whose developers would prefer to design mostly from an object rather than a relational point of view.TJDO was initially designed to support TriActive's web-based system's management service, and has done so since 2001. The most important project goals over time have been stability and scalability, often at the expense of newer features. Those features that are implemented are tested extensively. As an example of scalability, TJDO expends a lot of effort internally to minimize memory usage, such that literally thousands of large database schemas can be in-use concurrently with little memory cost. Getting StartedNew users can start by downloading the latest version and including the required jar files in their classpath. The tutorial, documentation, and the JDO API Javadocs are good places to begin when exploring TJDO. If you have any questions, comments, or problems please consult the docs or use the TJDO forums on SourceForge. NewsApril 4, 2008After a long hiatus, a new version 2.2 has been released. It still utilizes the JDO 1.0.1 API but includes a couple of the compelling JDO 2.0 features (query projection, aggregation, etc.) See the release history for details. |