[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-4882) restricting polymorphic query results

[Steve Ebersole (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Ebersole closed HHH-4882.
-------------------------------

      Assignee: Steve Ebersole
    Resolution: Duplicate

> restricting polymorphic query results
> -------------------------------------
>
>                 Key: HHH-4882
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4882
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.5.0-Beta-4
>         Environment: JPA 2.0, Hibernate 3.5.0-Beta4, MySQL 5.1, Glassfish v3.
>            Reporter: Domenico Loiacono
>            Assignee: Steve Ebersole
>
> I want to limit the polymorphic query results using JPA 2.0 syntax (TYPE) :
> SELECT e FROM Employee e WHERE TYPE(e) IN (FullTime, Executive)
> but it seems that Hibernate 3.5.0-Beta4 doesn't support this syntax because in the generated sql query the 'type' keyword remains unmapped and MySQL throws an Exception:
> Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(type(employee0_.id) in (5))' at line 1
> So I tried with Criteria API:
> CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder(); 
> CriteriaQuery<Employee> criteria = criteriaBuilder.createQuery(Employee.class);
> Root<Employee> employee= criteria.from(Employee.class);
> criteria.where(employee.type().in(FullTime.class,Executive.class));
> But I received an Exception:
> Caused by: java.lang.IllegalArgumentException: Unexpected call on EntityTypeExpression#render
> at org.hibernate.ejb.criteria.expression.PathTypeExpression.render(PathTypeExpression.java:48)
> at org.hibernate.ejb.criteria.predicate.InPredicate.render(InPredicate.java:164)
> at org.hibernate.ejb.criteria.QueryStructure.render(QueryStructure.java:258)
> at org.hibernate.ejb.criteria.CriteriaQueryImpl.render(CriteriaQueryImpl.java:340)
> at org.hibernate.ejb.criteria.CriteriaQueryCompiler.compile(CriteriaQueryCompiler.java:150)
> at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:416)
> at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createQuery(EntityManagerWrapper.java:489)
> So I opened the PathTypeExpression class and in the render method I saw :
> public String render(CriteriaQueryCompiler.RenderingContext renderingContext) {
> // todo : is it valid for this to get rendered into the query itself?
> throw new IllegalArgumentException( "Unexpected call on EntityTypeExpression#render" );
> }
> Then I switched to use Hibernate custom query syntax (class) :
> SELECT e FROM Employee e WHERE (e.class) IN (FullTime, Executive)
> Ok this works fine.
> But when I add a join with another entity (Department) that has the same TABLE_PER_CLASS inheritance strategy of entity Employee, I have a new problem:
> SELECT e FROM Employee e JOIN e.departments d WHERE d.code = 'D1' and (e.class) IN (FullTime, Executive)
> GRAVE: Column 'clazz_' in where clause is ambiguous
> Caused by: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute query

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