Best JDO Implementation?

Hi
I'm looking for a JDO implementation that supports both object-relational (O/R) mapping as well as object-to-object database (O/O) mapping in the same implementation. Ideally by changing a config file, I'd like to be able to switch from an O/R scheme to a pure O/O scheme. (I'm working on an application with embedded persistence capability and the fewer 3rd party components like rdbms, the better, but I'd also like to give customers the choice to use a relational db for persistence.)
Any views on the best implementation of JDO that will provide this?
Thanks in advance

Well, it's a matter of customer preference. Some customers want direct access to their data (via an industry standard like JDBC) while others might not care, as long as their data is persisted of course. From a Java development perspective, surely it has to be more efficient to store objects directly (?) in an object database so that would be the default way of doing it but on specific customer request, it would be good to provide the flexibility. If there's no JDO implementation that allows a complete abstraction of the data store like this, then I agree there's no point in doing this (in which case I'd rather select the object-relational route).

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Hi All,
Till now no one has answered for my query.
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Edited by: V R K Raju P on Feb 17, 2009 1:04 PM

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Edited by: V R K Raju P on Feb 11, 2009 12:25 PM
Edited by: V R K Raju P on Feb 11, 2009 12:25 PM

Raju,
The best practices are all scenario based.
You may however check them out.
help.sap.com -> Best Practices.
Best Practice for Portal =>
http://help.sap.com/content/bestpractices/crossindustry/bestp_crossindustry_ep.htm
http://help.sap.com/bp_epv170/EP_US/HTML/Portals_intro.htm
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In article <bdff1m$tvj$[email protected]>, Kishore jaladi wrote:
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Stream of consciousness alert.
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