Hi,
EntityManager.getReference() is your friend here.
-Patrick
On Thu, Apr 3, 2008 at 4:19 AM, Ognjen Blagojevic <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> Is there a way to persist an Entity without loading all the referenced
> objects?
>
> I know that this is possible:
>
> Employee e = new Employe();
> e.setName("John Doe");
> e.setIdDepartment(findDepartmentByPrimaryKey(idDept));
> e.setIdRank(findRankByPrimaryKey(idRank));
> // and so on
> em.persist(e);
>
> But if I have a lot of references, and lot of INSERTS to do, this becames
> import with poor performace (before each INSERT statemet app must execute N
> selects).
>
> It would be much faster if I can set references without looking them up:
>
> Employee e = new Employe();
> e.setName("John Doe");
> Department dept = new Department();
> dept.setIdDepartment(idDept);
> e.setIdDepartment(dept);
> // and so on
> em.persist(e);
>
> (Please note here: I'm not trying to insert new department, but rather to
> set a reference to existing one without looking it up in the database.)
>
> But this seems impossible. Without CascadeType.PERSIST it throws something
> like:
>
> <openjpa-1.0.2-r420667:627158 nonfatal user error>
> org.apache.openjpa.persistence.InvalidStateException: Encountered unmanaged
> object "[EMAIL PROTECTED]" in persistent field
> "mypackage.Employee.idDepartment" of managed object "mypackage.Employee-5"
> during flush. However, this field does not allow to be CascadeType.PERSIST.
> You cannot flush unmanaged objects.
>
> Ok, I add the CascadeType.PERSIST, and then:
>
> org.apache.openjpa.persistence.InvalidStateException: The generated value
> processing detected an existing value assigned to this field:
> mypackage.Department.idDepartment. This existing value was either provided
> via an initializer or by calling the setter method. You either need to
> remove the @GeneratedValue annotation or modify the code to remove the
> initializer processing.
>
>
> It must be a way to INSERT objects in the database without looking up for
> all the references, but I am not able to find it.
>
> Regards,
> Ognjen
>
--
Patrick Linskey
202 669 5907
