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Java EE 7 Developer Handbook by Peter A. Pilgrim

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JPQL

The JPA standard specification has a description of JPQL, which allows developers to write queries for entities and their persistent state. JPQL is designed to be portable from one JPA provider to another. These JPQL are guaranteed to work regardless of the underlying database.

As with many technologies, especially when the Java EE platform is moving to the cloud, some features of JPQL are achievable and others are not. This might sound like a contradiction in terms, but it is very important when your business is deciding whether to invest in the cloud computing vendor. One of the most important facets of information technology is storing large and exceptionally huge quantities in multiple stores. The next part is deciding how to access and ...

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