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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/orm.xml"

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{{EclipseLink_UserGuide}}
 
=orm.xml=
 
=orm.xml=
 
Use the '''orm.xml''' file to apply the metadata to the persistence unit. This metadata is a union of all the mapping files and the annotations (if there is no '''xml-mapping-metadata-complete'''  element). If you use one mapping '''orm.xml''' file for your metadata and place this file in a META-INF directory on the classpath, then you do not need to explicitly list it. The EclipseLink persistence provider will automatically search for this file ('''orm.xml''')and use it.  
 
Use the '''orm.xml''' file to apply the metadata to the persistence unit. This metadata is a union of all the mapping files and the annotations (if there is no '''xml-mapping-metadata-complete'''  element). If you use one mapping '''orm.xml''' file for your metadata and place this file in a META-INF directory on the classpath, then you do not need to explicitly list it. The EclipseLink persistence provider will automatically search for this file ('''orm.xml''')and use it.  

Revision as of 12:33, 18 June 2010



orm.xml

Use the orm.xml file to apply the metadata to the persistence unit. This metadata is a union of all the mapping files and the annotations (if there is no xml-mapping-metadata-complete element). If you use one mapping orm.xml file for your metadata and place this file in a META-INF directory on the classpath, then you do not need to explicitly list it. The EclipseLink persistence provider will automatically search for this file (orm.xml)and use it.

If you use a different name for your mapping files, or place them in a different location, you must list them in the mapping-file element of the persistence.xml file, as shown here:

 <persistence-unit name="EmployeeService">
     <jta-data-source>jdbc/EmployeeServiceDS</jta-data-source>
     <mapping-file>META-INF/employee_service_queries.xml</mapping-file>
 </persistence-unit>

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Note: In this example, the orm.xml file is not listed -- the persistence provider finds it by default.


Advantages and Disadvantages of Using XML

Some advantages of using XML instead of Annotations include:

  • No coupling between the metadata and the source code
  • Compliance with the existing, pre-EJB 3.0 development process
  • Support in IDEs and source control systems

The main disadvantages of mapping with XML include:

  • Its inherent complexitiy (when compared to annotations)
  • The need for replication of the code context


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Version: 2.1.0
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