Multiple Databases within the same application

Hello All,

I have a question about multiple database connections. 

I have 3 separate database connections going to 3 different databases. 

When I use the following code: 

PersistentFactory pf = (PersistentFactory) request.getService(PersistentFactory.ROLE,
						request.getDomain());	

I get a connection to the first jdbc connection listed within the merged.config file.

How do I set one of those connections apart from the other 2 as the default connection when I use the code: request.getDomain()?

Thanks,
Tim