how does the derby work in ofbiz

Hi all,

The default database of ofbiz is the java database derby.
I check out the newest version of ofbiz to my pc. It can
work well. But my question is that: how does it work?
What forms of the data is accessed? I know little about
the entity engine. But i can make out the whole thing.
Can anyone tell about it?

Thanks a lot for you all!

--
Sincerely,

Computer Science, Ocean University of China
phone: [phone]
email: [hidden email]

Kelin.