Re: [eclipselink-users] AttributeGroup, EntityManager.load(...) with Rel

[Andrei Ilitchev <andrei.ilitchev@xxxxxxxxxx>]

I've tried a similar arrangement and it worked - the difference is no 
table-per-class inheritance and ManyToMany instead of OneToOne:

Employee LAZY ManyToManyMapping("projects") Project
HugeProject inherits from Project (HugeProject defines "evangelist")
HugeProject LAZY OneToOneMapping("evangelist") Employee

// read the Employee
Employee empRead = em.find(Employee.class, id);
// create LoadGroup
LoadGroup lg = new LoadGroup();
lg.addAttribute("projects.evangelist");
// load - all SELECT calls executed here
JpaHelper.getEntityManager(em).load(empRead, lg);
// both project and evangelist have been already loaded, the following 
line generates no SQL
String evangelistName = 
((HugeProject)empRead.getProjects().iterator().next()).getEvangelist().getFirstName();

On 9/14/2012 7:55 AM, sr_dd wrote:
> Hello,
>
> I have a question about fetching Relations with the
> EntityManager.load(...)-functionality.
>
> Following Example:
> I have an abstract superclass "AbstractPerson" and two concrete
> implementations "LargePerson", "SmallPerson". Additional to the fields and
> relations defined in the "AbstractPerson" the concrete classes have some
> relations on their own. All classes mapped as entities with table-per-class.
>
> Now I have an entity "Example" with a oneToOne Mapping to a property
> "person" of Type "AbstractPerson".
>
> What I want to do now is:
> * load some Entity of Type example.
> * Define a AttributeGroup which contains the oneToOne relation "person" and
> relations of the concrete-implemented-entities of AbstractPerson.
> * execute JpaEntityManager.load(entities,attributeGroup)
> * as result I expect the path example.person.concreteRelationOfTypeOfPerson
> is fetched.
>
> All I achieved so far is the path example.person is fetched.
>
> What can I do?
>
> best regards
> Stefan
>
>
>
>
>
> --
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