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 Post subject: DataIntegrityViolationException : unique constraint
PostPosted: Mon Apr 06, 2009 12:28 pm 
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Joined: Mon Apr 06, 2009 12:14 pm
Posts: 1
We are seeing the exception org.springframework.dao.DataIntegrityViolationException: Hibernate operation: ORA-00001: unique constraint , when we are updating a coulmn(this column is not part of the constarint) with a value which had the null in database.
When we see the hibernate logs , insert query got generated here.


But , the update went fine , if the the column metioned above didnt have the null value. But here , update query got generated.

So , the question is , why is that "null" is a special case , for updation( eventhough it is not part of the constraint)


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