Connection to multiple databases using a single EJB

How can I connect to multiple Databases (using @PersistenceContext) using an EJB?
Did I need to connect various Entity Managers corresponding to the each database and simply send my Queries?
I am using Glassfish Application Server
Netbeans IDE
Java Derby Database
Oracle Database
Java Persistence API
Thanks in Advance

Yes, you need a persistence context and thus entity manager per database. Depending on what you want to achieve you may also need to go to the next level in your skill set and learn all about distributed transactions.

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Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
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Copyright (c) 1991, 2005, Oracle. All rights reserved.
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