I've read something like that in the docs today. I've test to call
getLastLocation() a couple of hours ago, but it don't help to solve the
issue.
2011/1/4 Stephen Johnson <onepagewo...@gmail.com>
> I just took a quick glance at your original post. The only thing I can
> think of is that in the original code you don't call getLastLocation so if
> you have lazy loading on then that object wouldn't get loaded and perhaps
> then the JDO mechanism doesn't realize to get the old object and delete it
> and re-assign the new object. In your original code I'd try doing a
> getLastLocation call to force the load. I use JDO but I don't use it's
> automatic relationship management. I manage all my relationships myself so I
> have complete control and don't need to then worry about these issues so in
> essence JDO for me is just a simple mapper between Java and the Datastore
> and it works very well for me.
>
>
> On Tue, Jan 4, 2011 at 10:56 AM, yoyo <yoyomo...@gmail.com> wrote:
>
>> I don't really have to do like that. Your solution is more clean and I
>> will use it. Thanks.
>> But for learning purpose, I've used some others methods.
>> I don't know why i can't update a children reference per another.
>> In fact, the new object is in the datastore. When I manually delete the
>> first reference, the parent now refer his new children. Weird.
>>
>> 2011/1/4 Stephen Johnson <onepagewo...@gmail.com>
>>
>> Why do you have to delete the location entity? Why not just update the
>>> current location entity with the new coordinates? That would be much
>>> more efficient.
>>>
>>>
>>> On Tue, Jan 4, 2011 at 10:20 AM, yoyo <yoyomo...@gmail.com> wrote:
>>>
>>>> The update still don't works. I give up.
>>>>
>>>> I use the "@Persistent(dependent = "true")" and add the delete
>>>> instruction when I update the user location, in a transaction.
>>>> Now it works, but I think it's not very clean/efficient.
>>>>
>>>> Have a nice day.
>>>>
>>>> public void updateUserLocation(String username, Location newLocation)
>>>> {
>>>> PersistenceManager pm = PMF.getPersistenceManager();
>>>> Transaction tx = pm.currentTransaction();
>>>> try {
>>>>
>>>> // Get the user and update the location
>>>>
>>>> tx.begin();
>>>> POJOUser user = pm.getObjectById(POJOUser.class, username);
>>>> pm.deletePersistent(user.getLastLocation());
>>>> user.setLastLocation(new POJOLocation(newLocation));
>>>> tx.commit();
>>>>
>>>> } catch (JDOObjectNotFoundException ex) {
>>>>
>>>> } finally {
>>>>
>>>> if (tx.isActive()) {
>>>> tx.rollback();
>>>> }
>>>> pm.close();
>>>> }
>>>> }
>>>>
>>>> @PersistenceCapable
>>>> public class POJOUser {
>>>>
>>>> /** Primary key */
>>>> @PrimaryKey
>>>> @Persistent
>>>> private String key = null;
>>>>
>>>> /** Username */
>>>> @Persistent
>>>> private String username = null;
>>>>
>>>> /** Password */
>>>> @Persistent
>>>> private String password = null;
>>>>
>>>> /** The last location of the user */
>>>> @Persistent(dependent = "true")
>>>> private POJOLocation lastLocation = null;
>>>> ...
>>>> }
>>>>
>>>> @PersistenceCapable
>>>> public class POJOLocation implements Location {
>>>>
>>>> /** Primary key */
>>>> @PrimaryKey
>>>> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
>>>> private Key key = null;
>>>>
>>>> /** X */
>>>> @Persistent
>>>> private Double x = null;
>>>>
>>>> /** Y */
>>>> @Persistent
>>>> private Double y = null;
>>>> ....
>>>> }
>>>>
>>>>
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