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Mapping inherited id attribute [message #385404]

Wed, 28 January 2009 00:00

David J Rericha

Messages: 13
Registered: July 2009

Junior Member

Dear fellow members,

I would like to inherit an id attribute from a mapped superclass using a
Table sequence generator. However, I would like the column names and the
sequence names to be different for the subclasses. I found this question
asked here:
http://dev.eclipse.org/newslists/news.eclipse.rt.eclipselink /msg00180.html,
but I could not figure it out. If a DescriptorCustomizer is the way to do
this, could you provide an example? I cannot find anything explicit in
the documentation.

Thanks,

David

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Re: Mapping inherited id attribute [message #385408 is a reply to message #385404]

Wed, 28 January 2009 13:51

James Sutherland

Messages: 1939
Registered: July 2009
Location: Ottawa, Canada

Senior Member

JPA does not allow you to override a generator in a subclass.

To use a DescriptorCustomizer it would do something like:

public class MyCustomizer implements DescriptorCustomizer {
public void customize(ClassDescriptor descriptor) {
descriptor.setSequenceName("SUB_SEQ");
}
}

Where SUB_SEQ was another sequence generator that you defined.

For a list of ClassDescriptor API see,

<a
href=" http://wiki.eclipse.org/Configuring_a_Relational_Descriptor_ (ELUG)#How_to_Configure_Sequencing_at_the_Descriptor_Level_U sing_Java ">User
Guide</a>

---
James
http://www.nabble.com/EclipseLink---Users-f26658.html

James : Wiki : Book : Blog : Twitter

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