When you use a transparent persistence interface like JDO with an object database, there
is no need for data conversion (or mapping) from tables to objects
and back. Both the Enterprise Java Beans (EJBs) and the database use the same
object model. This is illustrated in
the diagram where it indicates that no data conversion is needed.
If you use a relational database as part of an EJB accelerator, there will be
data conversion. The location of that data conversion will depend on the
interface you use:
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