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http://opensource.atlassian.com/projects/hibernate/browse/HHH-5950?page=c...
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Manuel Bernhardt commented on HHH-5950:
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We have a case where quite some (around 20) entities are assigned to a project.
Additionally, those entities all have a natural identifier (so for each project, that
identifier starts at 1). Hence (naturalId, project) should be unique. I preferred this
approach (multi-column unique constraint) over using a real composite primary key because
that seems to be complicating things quite a bit (and hey, the doc says that it should be
used for legacy applications only :) )
So in the current situation I have to copy-paste the uniqueness constraint all over the
place and I'm a bit worried that this may lead to issues on the long run (e.g. when
forgetting the constraint for one entity, or when new members join the team...).
I agree that @UniqueConstraint is a physical concern. I'm wondering, is there a way to
innovate on the UniqueConstraint so that could do more stuff than JPA? Because in that
case, one way to address the abstract / concrete issue would be to add a propertyNames
element to the annotation/mapping which then would apply to entity-level properties. And
allowing to inherit an annotation of that kind would then perhaps make more sense. (of
course, columnNames and propertyNames could not be used together).
Make @UniqueConstraint inheritable
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Key: HHH-5950
URL:
http://opensource.atlassian.com/projects/hibernate/browse/HHH-5950
Project: Hibernate Core
Issue Type: New Feature
Components: annotations
Affects Versions: 3.6.1
Reporter: Manuel Bernhardt
It would be really nice to be able to define a @UniquenessConstraint in a
@MappedSuperclass so that all subclasses carry this constraint. Right now, the following
constraint is ignored:
@MappedSuperclass
@Table(uniqueConstraints = {@UniqueConstraint(name="inheritedConstraint",
columnNames = {"matter", "value"})})
public class Space { ... }
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