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Auto ID generation strategy in JPA

 
bagaria kushal
Greenhorn
Posts: 19
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If we specify id generation strategy as AUTO, the persistence provider chooses one of the following strategies :-

- Table
-Sequence
-Identity

My question is on what basis or criteria does the persistence provider decides which strategy to be used?
 
James Sutherland
Ranch Hand
Posts: 553
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This depends on the provider.

By default EclipseLink uses TABLE sequencing. This is because IDENTITY and SEQUENCE require database support, so TABLE is the most platform independent.

See,
http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Entities/Ids/GeneratedValue#.40GeneratedValue
 
It is sorta covered in the JavaRanch Style Guide.
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