[Hibernate-issues] [Hibernate-JIRA] Resolved: (ANN-314) Problem with PolymorphismType.EXPLICIT

[Emmanuel B. (JIRA) <no...@at...>]

     [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-314?pa=
ge=3Dall ]
    =20
Emmanuel Bernard resolved ANN-314:
----------------------------------

    Resolution: Rejected

you misunderstood polymorphism.
polymorphism explicit only applies on root entities and prevent queries nam=
ing a (unmapped) superclass to return mapped sub entities

if your case if ObjectA were not mapped and ObjectB were having polymorphis=
m explicit, then from ObjectA would not return ObjectB elements

> Problem with PolymorphismType.EXPLICIT
> --------------------------------------
>
>          Key: ANN-314
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/A=
NN-314
>      Project: Hibernate Annotations
>         Type: Bug

>     Versions: 3.1beta7
>     Reporter: =C3=81lvaro Queiroz Valente

>
>
> @Entity(access =3D AccessType.FIELD)
> @org.hibernate.annotations.Entity(polymorphism =3D PolymorphismType.EXPLI=
CIT)
> @Table(name =3D "TableA")
> @Inheritance(strategy =3D InheritanceType.TABLE_PER_CLASS)
> public class ObjectA{
> @Entity(access =3D AccessType.FIELD)
> @Table(name =3D "TableB")
> public class ObjectB extends ObjectA{=20
> When we call ObjectA ("findByKey") the Hibernate always use select union =
with TableB, but the expect is select only TableA , because we use polymorp=
hism =3D PolymorphismType.EXPLICIT.

--=20
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