Hibernate is one of the best object/relational persistence and query service. Basically it lets you code your application using POJOs and it takes care of persisting it to a RDBMS back-end. If you couple this with a HA/High performance cache service like JbossCache as a second level cache you get a very fast, high availability, easy to code solution, to manage the data in your application.
In Hibernate you can "find" the objects you need (using a primary key), modify them and the back-end will make sure the changes are propagated to the database. Hibernate also lets you use a
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