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
