> Can you post the JPA version of your entity?
@Entity
public class Friend {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;
private String lastName;
public int crud;
private String firstName;
@Basic
private Collection<Key> friends;
> I've just built something similar, and if I pass a Key to:
>
> query.setParameter("key", key);
>
> This works correctly, though if I pass the String key to it
>
> query.setParameter("key", "someLongString");
what was ur query? was the query to filter on a collection?
i have set the parameters against primitive members successfully but
not against collection members.
> It returns an empty list. Could this be what is happening?
no.i just retested my code to make sure i hadnt messed up. i am
definitely using a Key not a string.
//JPA
javax.persistence.Query query = em.createQuery("select from Friend f
where f.friends=:key");
query.setParameter("key", user2.getKey());
return list of 0
using the *same* JPA entity code the JDO works fine
//JDO
javax.jdo.Query query = pm.newQuery(Friend.class);
Key myKey = user2.getKey();
query.declareParameters("com.google.appengine.api.datastore.Key
myKey");
query.setFilter("friends == myKey");
query.setOrdering("lastName ASC, firstName ASC");
List<Friend> friendList = (List<Friend>) query.execute(myKey);
return correct list
Q1 can u post your JPA code so i can see what u have done differently?
Q2. is mixing JPA and JDO ok? ie. JPA entity and JDO seems to work for
me.
Q3.how does the collection equality filter work in app engine? I have
not found any docs to explain the 'voodoo' like behaviour.
from what i can determine the collection filter is executed on the
data store and not in the application as the unfiltered list executed
the 1000 row limit.
it works but i dont understand how.
any help most appreciated
-lp
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