This architecture shows two existing relational databases being used by a
J2EE application server. One database is being accessed using JDO and the other
by JDBC. A third database is being used in the middle tier as an EJB
accelerator.
The database used as an EJB accelerator could hold data that is unique to the
needs of the EJB components, a copy of the data that is updated in the
relational database, or both types of data. This is referred to as having
"in-line updates" because any updates by EJB components are made
directly, or in-line, to the underlying relational database. This is in contrast
to "staged
updates" (new window).
Object databases make for an excellent middle-tier database for use with EJB
components. This is because the object model used by EJB components is the same
model used by object databases. For more information, see:
This architecture using an object database will likely provide better
performance than if no database or a relational database was used in the middle
tier. In either case, the objects in the EJB components would need to be mapped
to some degree to the relational model -- either in the middle tier or in the
EIS Tier. This is most likely true even with the SQLJ using the SQL:1999 object
model. See Part 2 in SQLJ
(new window).
For an even higher-performing architecture, see "staged
updates" (new window).
Multiple components use JDO to access the relational database.
JDO allows the mapping between Java objects and tables to be defined in one
place for use by the multiple components. See JDO
data conversion (new window).
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