[Hibernate-JIRA] Created: (HHH-6911) Write DiscriminatorValue to DiscriminatorColumn when combined with InheritanceType#JOINED
by Steve Ebersole (JIRA)
Write DiscriminatorValue to DiscriminatorColumn when combined with InheritanceType#JOINED
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Key: HHH-6911
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6911
Project: Hibernate Core
Issue Type: Improvement
Components: annotations, metamodel
Reporter: Steve Ebersole
Priority: Minor
The JPA spec states that {{DiscriminatorColumn}} can be used in conjunction with JOINED inheritence. The only section that seems to deal with this combination is _11.1.10 DiscriminatorColumn Annotation_ where it says
{quote}
For the SINGLE_TABLE mapping strategy, and typically also for the JOINED strategy, the persistence
provider will use a type discriminator column. The DiscriminatorColumn annotation is used to
define the discriminator column for the SINGLE_TABLE and JOINED inheritance mapping strategies.
{quote}
Apparently this is meant to imply that even if providers do not need/use the discriminator for concrete class resolution (reading) they are still expected to write it out to the database. Dunno, thats just what we have been told :)
Anyway, like I said, Hibernate itself does not need the discriminator column/value to interpret the concrete classes. However, in the interest of portability we certainly *could* write it out. Longer term
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12 years, 4 months