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From "bernard (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1541) Support Enum as Primary Key Type
Date Thu, 25 Feb 2010 20:40:27 GMT
Support Enum as Primary Key Type
--------------------------------

                 Key: OPENJPA-1541
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1541
             Project: OpenJPA
          Issue Type: New Feature
          Components: jpa
    Affects Versions: 2.0.0-beta
         Environment: All
            Reporter: bernard
            Priority: Critical


Enums work as primary keys in TopLink and EclipseLink. DataNucleus supports them, too:

http://www.datanucleus.org/products/accessplatform/jpa/primary_key.html

It would be good to also include this in the specification because, not to support type safety
in primary keys is fairly sad.

Enum is a basic language feature, and most applications would enjoy significant benefits by
mapping the keys of those little system behavior controlling lookup tables to enums.

Consider a payment_type table. One can only generate the IDs of the table and use them for
switching safely when the ids are mapped to enums. Any such application would typically have
a PaymentType enum anyway.



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