Best Practice to Setup an application to work with both oracle and db2 db

Hi,
We have an application that currently supports both oracle and db2 databases . It is currently using JPA with eclipselink as backend mechanism and we want to move to ADFBc as our backend . So what is best practice to do this?
I came across an old post in https://groups.google.com/forum/#!topic/adf-methodology/UlJZSTu14Io that states to create two different model projects to support oracle and db2 .
Is this still the standard ? Is there a way that we could work around rather than creating multiple projects?
How do i get the view controller to work with multiple model projects if this is the case?
Thank you.

Thanks for the response .
The problem is i would have the same schema on both the databases (both in oracle and db2) .
I don't see a scenario where i want both the application model projects at the same time . What i meant is , Application will either be deployed with Oracle DB or DB2 but not with both on a production environment .
So is there a way where i just change the connection parameters alone rather having two different models ?
If i have to use two model projects , would it be possible say i built the view controller for Oracle , and use it for DB2 if i make sure the BC objects names are similar between model projects and switch just the model jar based on the deployment environment ?
-Sam

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