FetchGroups do seem to be exactly what I'm looking for. At any rate,
although I am able to successfully remove and add fetch groups from my
query, it doesn't seem to affect what data is populated. I am running
OpenJPA 1.0.3 on JDK 1.5/5.0. Can you take a peek and see if you see
anything obvious here? Here's recent output from my simple test case:
Output:
[10/22/08 10:08:07:437 CDT] 0000005a SystemOut O Before swapping fetch
groups:
[10/22/08 10:08:07:437 CDT] 0000005a SystemOut O default
[10/22/08 10:08:07:437 CDT] 0000005a SystemOut O After swapping fetch
groups:
[10/22/08 10:08:07:437 CDT] 0000005a SystemOut O basic
[10/22/08 10:08:07:500 CDT] 0000005a SystemOut O Name: Deleted
[10/22/08 10:08:07:500 CDT] 0000005a SystemOut O Group Name: Statuses
As you can see, both the "groupName" property and "name" property contain a
value. As you can see from my "basic" fetch group, name should not be
fetched. Here is my code:
<code>
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("ProofOfConcept");
EntityManager em = emf.createEntityManager();
OpenJPAEntityManager oem = OpenJPAPersistence.cast(em);
OpenJPAQuery query = OpenJPAPersistence.cast(oem.createQuery("SELECT D FROM
DataItemBean D WHERE D.id=:id"));
System.out.println("Before swapping fetch groups:");
Collection groups = query.getFetchPlan().getFetchGroups();
Iterator iter = groups.iterator();
while(iter.hasNext()){
Object o = iter.next();
System.out.println(o);
}
query.getFetchPlan().removeFetchGroup("default");
query.getFetchPlan().addFetchGroup("basic");
System.out.println("After swapping fetch groups:");
groups = query.getFetchPlan().getFetchGroups();
iter = groups.iterator();
while(iter.hasNext()){
Object o = iter.next();
System.out.println(o);
}
java.util.List list = (java.util.List)query.setParameter("id", new
Integer(501))
.getResultList();
for(int i = 0; i < 10 && i < list.size(); i++){
DataItemBean dib = (DataItemBean)list.get(i);
System.out.println("Name: " +dib.getName());
System.out.println("Group Name: " +dib.getGroupName());
}
...
@Entity
@FetchGroups({
@FetchGroup(name="basic", attributes={
@FetchAttribute(name="id"),
@FetchAttribute(name="groupName")
})
})
@Table(name="DATA_ITEMS", schema="COMMON")
public class DataItemBean implements Serializable {
@Column(name="ID")
protected int id = 0;
@Column(name="GROUP_NAME")
protected String groupName = null;
@Column(name="NAME")
protected String name = null;
--getters and setters --
</code>
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