How can I manage my data sources better?

I'm learning WebLogic and my installation already has a data source configured to point to one of our eight databases. As we move through different phases of development, I need to point to a different database and changing it in WL is cumbersome. What I would like is to have all eight databases added as eight sources and enable only one at a time depending on our needs. I'd like to know:
1) How does WebLogic know which data source to use for my .ear?
2) With more than one data source, how do I ensure that only the one I want is used by my ear?
Many thanks,
TenLeftFingers

It depends a bit on what you want to do (what you mean by "manage"), but perhaps this will help:
Settings app > iCloud >
http://help.apple.com/ipad/7/#/iPad995bbafe

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