[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3704) Criteria Query on property of sandwich-like @MappedSuperclass fails. HQL works
Vikash Madhow (JIRA)
noreply at atlassian.com
Tue Apr 7 08:09:37 EDT 2009
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32816#action_32816 ]
Vikash Madhow commented on HHH-3704:
------------------------------------
Well, AFAIK, you do not need to join A to B to be able to sort by b.s if B is only a component of A. I've been sorting by component properties in my system and it works.
It makes sense for Hibernate to throw an exception if you attempt to join A to B since components are stored in the same table as their container and as such a join is not meaningful.
To illustrate, if you have the following:
@Entity
class A {
@Embedded
B b;
}
@Embeddable
class B {
String s;
C c;
}
@Entity
class C {
String t;
}
sorting by b.s requires no join. Sorting b.c.t, however, requires a Join from A to C (and not B to C).
Hope this helps.
V.
> Criteria Query on property of sandwich-like @MappedSuperclass fails. HQL works
> ------------------------------------------------------------------------------
>
> Key: HHH-3704
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3704
> Project: Hibernate Core
> Issue Type: Bug
> Components: query-criteria
> Affects Versions: 3.3.1
> Environment: hibernate 3.3.1, mysql 5.0.45
> Reporter: Christian kalkhoff
> Priority: Minor
>
> I have a hierarchy of @MappedSuperclasses, in my case:
> @MappedSuperclass class BaseEntity{...}
> @MappedSuperclass class NamedBaseEntity extends BaseEntity {...}
> @Entity class ConcreteEntity extends NamedBaseEntity {...}
> @Entity class AggregatingOtherEntity extends NamedBaseEntity {
> ConcreteEntity concreteEntity;
> }
> BaseEntity holds property "id", NamedBaseEntity holds property "name". ConcreteEntity might have property "moonphase".
> If I create a Criteria search expression on AggregatingOtherEntity like
> eq("concreteEntity.id", 1L)
> that works.
> eq("concreteEntity.moonphase", "half decending") works either.
> BUT
> like("concreteEntity.name", "foobar")
> raises QueryException:
> org.hibernate.QueryException: could not resolve property: concreteEntity.name of: AggregatingOtherEntity
> org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:67)
> org.hibernate.persister.entity.AbstractPropertyMapping.toColumns(AbstractPropertyMapping.java:82)
> org.hibernate.persister.entity.BasicEntityPropertyMapping.toColumns(BasicEntityPropertyMapping.java:54)
> org.hibernate.persister.entity.AbstractEntityPersister.toColumns(AbstractEntityPersister.java:1377)
> org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumns(CriteriaQueryTranslator.java:457)
> org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumnsUsingProjection(CriteriaQueryTranslator.java:417)
> org.hibernate.criterion.SimpleExpression.toSqlString(SimpleExpression.java:68)
> org.hibernate.criterion.LogicalExpression.toSqlString(LogicalExpression.java:62)
> org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:357)
> org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:113)
> org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:82)
> org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:91)
> org.hibernate.impl.SessionImpl.list(SessionImpl.java:1577)
> org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306)
> [...]
> If I refactor the Criteria search to plain HQL (From AggregatingOtherEntity Where concreteEntity.name like 'half decending') it works. So there is a workaround.
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