James-
It should be possible. The easiest way (and the most implementation-
agnostic) would be to simply generate the classes with the
appropriate mapping annotations, and then just load them at runtime.
The somewhat tricky part would be to ensure they get enhanced by the
system when they are loaded. You could just run the -
javaagent:openjpa.jar flag with no arguments, and I believe it will
scan all loaded classes for annotations, but that can slow things
down quite a bit. A faster solution would be to run your generated
classes through the enhancer.
Take a look at the code for
org.apache.openjpa.enhance.PCClassFileTransformer ... if you can't
use that directly, then it might be good to use as a starting point.
On May 14, 2007, at 10:00 AM, James Hang wrote:
Hi,
I'm curious if it's possible to create and map new entities at
Runtime?
We have an application which allows users to design new data models at
runtime. When new tables are being created in the database, we would
like to make OpenJPA aware of them. We are currently doing this in
Hibernate by generating the POJO classes dynamically using CGLIB,
adding
dynamically generated xml mappings to the Hibernate runtime
configuration and re-initializing the SessionFactory. Is there a
way to
do something similar in OpenJPA?
Thanks,
James
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