Java world has this
<A HREF="/javaworld/jw-01-2000/jw-01-step.html">Map
Java objects to database records </A>

A two-part series on object database implementation. 
A nice article.  

He does a better job of using interfaces, than is in
the current OPL code.

On some things he doesn't do as well.  

He doesn't use map to load and unload his internal
representation of fields (aka, attributes).  So, he
gets and puts all fields, not just db fields.

He uses members instead of methods for get and set. 
Scott Ambler suggests using methods, and I agree that
this is a better approach.  Internally, the class
might do some additional work (Scott call them
business rules) in the set method.

-- george




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