Java Feature — The Holy Grail of Database Independence

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The hope of using any persistence framework is absolute database independence. Database independence means that you can focus on your job as an application developer and not a DBA. However, no framework can fully make this claim. There's much more to running an application on a database than simply issuing compatible SQL queries and getting back the query results as expected. In my last article, I detailed the process by which we converted existing Enterprise Java Beans 2 (EJB2) Entity beans to Hibernate Plain Old Java Objects (POJOs). This article is less about our conversion process and more about the tools and methods we chose to work with for the Hibernate implementation and the backend databases (Oracle and PostgreSQL) supported by Hyperic HQ.

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