Generated ID starting with 0 can cause unexpected results
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Key: OPENJPA-1066
URL: https://issues.apache.org/jira/browse/OPENJPA-1066
Project: OpenJPA
Issue Type: Improvement
Components: kernel
Affects Versions: 2.0.0
Environment: any DB that allows a generated id to start with 0. And
an entity that maps that generated id to an int instead of an Integer
Reporter: B.J. Reed
Priority: Minor
Fix For: 2.0.0
Attachments: GeneratedIDStartsWith0.ZIP
Several DB's allow a generated id column to start with 0.
For instance, DB2 allows "GENERATED ALWAYS AS IDENTITY (START WITH 0)...."
When this is used, the very first object will have an id of 0. When entities
are first created, the user usually won't fill in the corresponding id field
(since it will be generated by the DB when the entity is put in the DB), so it
defaults to 0. The entity manager then uses this 0 and sees that an entity
already exists and will update the old entity in stead of creating a new one.
This is not a large issue, because a user could simply specify "START WITH 1"
as a very simple workaround or they could use an Integer instead of an int, but
it would be nice to fix so that new users don't hit this problem.
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