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If you are using existing databases with an application server, you might want to consider a Java Data Objects (JDO) interface. JDO allows you to move the mapping of data from the application server or application side to one location. This differs from Using JDBC with Application Servers or Using SQLJ with Application Servers. With JDBC, the mapping needs to be done above the JDBC interface. With JDO, the mapping is done below the JDO interface.

JDO is considered a form of transparent persistence. For more information on how transparent persistence compares to JDBC, see transparent persistence vs. JDBC call-level interface.

Also, be sure to check out how JDO can be part of integrated J2EE Architecture Solutions.

Using JDO, as shown in this diagram, will require data conversion between the interface and the database. See JDO Data Conversion.

JDO with application servers

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The Savvy Manager's Guide

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