This architecture is for a relatively simple Web site that uses a
J2EE-compliant application server. The diagram shows one new database in the Middle Tier of a Web
site and no existing databases or systems in the EIS Tier. There are
four ways that a database could be used in this architecture:
The first way is with a transparent interface such as Java Data Objects (JDO)
coupled with an object database. In this case, there is no need for a mapping
layer because the Java object model is the same model used by the object
database. See transparent
persistence in object databases (new window).
The lack of a mapping layer is show in this diagram.
The second way is with a transparent interface such as Java Data Objects
(JDO) coupled with a relational database. In this case, there is a need for a
mapping layer because the Java object model may not match the model used by the
relational database. Nevertheless, the mapping can be moved to one location as
described in JDO data
conversion (new window). Also see transparent
persistence in object-relational mapping (new
window).
The third way is with a call-level interface such as JDBC coupled with a
relational database. In this case, there is a need for a mapping layer
because the Java object model may not match the model used by the relational
database. The mapping would need to be done at the application level as
described in JDBC data
conversion (new window). Be sure to take a look at
transparent persistence vs. JDBC call-level interface
(new window). This outlines some
disadvantages of using JDBC that you should consider when designing
persistence for J2EE.
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