I've had trouble with the .getById methods, so I do it like this,
which seems to work reliably:
query = pm.newQuery(MyClass.class);
query.setFilter("_ID == :keyList"); //_ID is the PK
List<MyClass> results = (List<MyClass>)query.execute(Keys); //
Keys is List<key>
On May 24, 2:19 am, Ravi <[email protected]> wrote:
> Hi,
> I have a list of Key and i want to get Entity for all these key using
> JDO.
> Is it possible in JDO? Having a hard time to search through internet
> and not finding it.
> Tried using pm.getObjectsById(Collection), but it says Object not
> found with keys present in the list. I wrote following code for this
>
> PersistenceManager pm =
> DbSessionManager.getInstance().startDbSession();
> List<Key> keyList = new ArrayList<Key>();
> Key oneKey = KeyFactory.createKey("User", 9);
> keyList.add(oneKey);
> List<User> users = (List<User>)pm.getObjectsById(keyList); (Note:
> s after object)
>
> abovce code throws Exception that User(9) not found but it does exists
> in datastore and if i do
>
> User users = (User)pm.getObjectById(oneKey);(Note: no s after object)
>
> it returns the User(9)
>
> I also tried using Low level API like this and it works, but only
> problem is that it doesnt return its owned properties(see User class
> at the end, openIds are not returned and its always null, even though
> it does exists).
>
> public Map<Key, Entity> getObjectsById(List<Key> ids) throws
> AppException {
> DatastoreService ds =
> DatastoreServiceFactory.getDatastoreService();
> Map<Key, Entity> data = ds.get(ids);
> return data;
>
> }
>
> class User{
> Key id;
> String firstName;
> String lastName;
> List<OpenId> openIds;
>
> }
>
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