XORM is an extensible object-relational mapping layer for Java
applications. It provides interface-based persistence to RDBMSs while
allowing developers to focus on the object model, not the physical
31 May 2004: New Release! Download now!
XORM uses the API described by the Java
Data Objects (JDO) specification (JSR 12) and implements many of
the interfaces specified by JDO. In contrast to most
JDO implementations, XORM does not require you to run a class-file
enhancer before deploying your persistence-capable classes. Instead,
XORM allows you to specify persistence-capable classes using abstract
classes or interfaces; bean-style get()/set() methods are enhanced at
runtime to be managed for persistence.
XORM has been engineered to provide a rapid application development
environment, so you can build and persist Java objects with as little
effort as possible. XORM does not require a custom database schema
and does not create special tables in your database: you can map your
Java objects to most existing schemas, or start from scratch.
You can download the latest public release of XORM from the SourceForge
download page. For the adventurous, you can download current CVS
snapshots and/or check out the CVS tree directly from SourceForge.
XORM is Free
Software released under the GNU General Public
License. There are no export restrictions or fees for either
runtime or developer licenses.
The XORM user's guide briefly describes XORM's
usage. Most of the interfaces you'll use are part of
JDO, and XORM is simply the implementation running behind the scenes.
You can find general JDO articles and books elsewhere online.
If you'd like to get started using XORM now, the tutorial takes you step-by-step through an
example. If you're interested in comparing XORM with other JDO implementations, check out the features list.
The "xorm-users" email list is a place to ask questions and meet other
XORM users. If you're troubleshooting an issue or have general
to the list.
Of course! That's a major benefit of all this open source stuff. If
you'd like to get involved in the development of XORM, please see our
project page on
SourceForge for the current development status, and contact a project
administrator if you'd like to be involved as a developer, tester or
in any other capacity.
If you'd like to hack on XORM, you might want to view the XORM API JavaDocs. In general, however, you will be
coding against the JDO API and very infrequently need to use the
classes from the org.xorm.* hierarchy, so unless you're planning on
working on the internals of XORM, don't let these Javadocs scare you.
XORM uses the CGLIB code generation library, another SourceForge project.
Other free software projects that use the JDO API for object-relational mapping include Jakarta OJB and TriActive JDO.