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Difference between revisions of "EclipseLink/Examples/JPA/Composite"
< EclipseLink | Examples | JPA
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** Therefore Composite persistence unit allows to map different entities to different data bases. | ** Therefore Composite persistence unit allows to map different entities to different data bases. | ||
| − | * Below is an | + | * Below is an example of Composite persistence unit definition. |
** compositePu specifies transaction type and server platform. | ** compositePu specifies transaction type and server platform. | ||
** It contains all persistence units defined in member1.jar and member2.jar files. | ** It contains all persistence units defined in member1.jar and member2.jar files. | ||
Revision as of 18:59, 6 June 2011
- Two or more persistence units could be combined into a single Composite persistence Unit.
- Each composite members persistence unit keeps mapping its classes to its own database.
- Therefore Composite persistence unit allows to map different entities to different data bases.
- Below is an example of Composite persistence unit definition.
- compositePu specifies transaction type and server platform.
- It contains all persistence units defined in member1.jar and member2.jar files.
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence persistence_1_0.xsd" version="1.0"> <persistence-unit name="compositePu" transaction-type="JTA"> <provider> org.eclipse.persistence.jpa.PersistenceProvider </provider> <jar-file>member1.jar</jar-file> <jar-file>member2.jar</jar-file> <properties> <property name="eclipselink.composite-unit" value="true"/> <property name="eclipselink.target-server" value="WebLogic_10"/> </properties> </persistence-unit> </persistence>
For more information about Composite persistence units please see the design doc.