[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5301) Add support for parametrizing TYPE(e) expressions

[Gail Badner (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=37492#action_37492 ] 

Gail Badner commented on HHH-5301:
----------------------------------

Section 4.6.17.4 says:

"The Java class of the entity is used as an input parameter to specify the entity type".

Are you getting the exception when you bind the Java class (i.e, not the entity name literal)?

If so, please do the following:

    * checkout the trunk version http://anonsvn.jboss.org/repos/hibernate/core/trunk
    * add a test that reproduces your issue to entitymanager/src/test/java/org/hibernate/ejb/test/query/QueryTest.java; 
    * create a patch using "svn diff" and attach to this issue

Thanks,
Gail


> Add support for parametrizing TYPE(e) expressions
> -------------------------------------------------
>
>                 Key: HHH-5301
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5301
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: query-hql
>    Affects Versions: 3.5.2
>         Environment: Hibernate 3.5.2, Java 6.0.20
>            Reporter: Luis Fernando Planella Gonzalez
>
> Support parameters for JPA 2's TYPE(alias) function.
> Test classes:
> @Entity
> @DiscriminatorColumn(name="subclass")
> @Table(name="xs")
> public abstract class XBase {
>     @Id
>     private Integer id;
>     public Integer getId() {
>         return id;
>     }
>     public void setId(Integer id) {
>         this.id = id;
>     }
> }
> @Entity
> @DiscriminatorValue("x1")
> public class X1 extends XBase {
>     @Basic
>     private String x1;
>     public String getX1() {
>         return x1;
>     }
>     public void setX1(String x1) {
>         this.x1 = x1;
>     }
> }
> @Entity
> @DiscriminatorValue("x2")
> public class X2 extends XBase {
>     @Basic
>     private String x2;
>     public String getX2() {
>         return x2;
>     }
>     public void setX2(String x2) {
>         this.x2 = x2;
>     }
> }
> Running the following query works: "select x from XBase x where type(x) = X1"
> However, the following one: "select x from XBase x where type(x) = :t" yelds
> Exception in thread "main" java.lang.UnsupportedOperationException: At the moment this type is not the one actually used to map the discriminator.
> 	at org.hibernate.persister.entity.DiscriminatorType.nullSafeSet(DiscriminatorType.java:111)
> 	at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:67)
> 	at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:567)
> 	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1612)
> 	at org.hibernate.loader.Loader.doQuery(Loader.java:717)
> 	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
> 	at org.hibernate.loader.Loader.doList(Loader.java:2294)
> 	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2172)
> 	at org.hibernate.loader.Loader.list(Loader.java:2167)
> 	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:448)
> 	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363)
> 	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
> 	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1258)
> 	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
> 	at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:241)
> 	at test.Main.main(Main.java:28)
> JPA 2's spec explicitly shows querying by type using parameters in section 4.6.17.4.

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