November 2003
Intermediate to advanced
1488 pages
36h 35m
English
book
BEA WebLogic Server™ 8.1 Unleashed
by Mark Artiges, Gupreet Singh Bhasin, Bernard Ciconte, Malcolm Garland, Saranathan Govindarajan, James Huang, Subramanian Kovilmadam, Kunal Mittal, Paul J. Perrone, Tom Schwenk, Steve Steffen
Content preview from BEA WebLogic Server™ 8.1 Unleashed
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Relationship Caching in EJBs
Caching of Entity beans and their related Entity beans improves performance by reducing the number of JOIN queries that have to be executed. In our earlier example, we had three types of relationships:
One-to-one— A doctor has an assistant.
One-to-many— A doctor has multiple patients.
Many-to-many— A doctor works at multiple hospitals and each hospital has multiple doctors.
The <relationship-caching> tag of weblogic-cmp-rdbms.xml is used to specify caching of these relationships. Listing 22.17 is an excerpt from a weblogic-cmp-rdbms.xml file showing the caching of relationships.
Listing 22.17. weblogic-cmp-rdbms Excerpt
<relationship-caching> <caching-name>cacheMoreBeans</caching-name> <caching-element> <cmr-field>assistantName</cmr-field> ... |
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