On Mar 10, 2008, at 1:29 AM, Riccardo Cohen wrote:
> Thanks a lot, I understand that I need a transaction now, while before
> it could work without this... I have no idea of how to do that.
>
> I noticed that in the doc of amber
> (http://caucho.com/resin/doc/amber.xtp) there was a
> @TransactionAnnotation but this makes a syntax error !
> Thanks to eclipse I found a @TransactionAnn, I added it at the
> beginning
> of my function definition, but this does not change (no update
> generated)
It should be @TransactionAttribute. I'm fixing the docs.
The @TransactionAttribute is the easiest method. You need to put it
on a Resin-IoC-aware object, e.g. a <bean> or an EJB stateless bean or
a servlet. If you put it on an arbitrary class, it won't do anything.
You can also use UserTransaction to do essentially the same thing:
class MyFoo {
@In UserTransaction _ut;
void myStuff()
{
_ut.begin();
try {
...
} finally {
ut.commit();
}
}
That's essentially identical to
@TransactionAttribute void myStuff()
{
...
}
If you turn logging level="fine", you'll see the transaction begin()/
commit(). So you can use the log to make sure the transactions are
working properly.
-- Scott
>
>
> Is there any doc about this ?
> Thanks
>
> Daniel López wrote:
>> Hi again,
>>
>> Some quick tests show that no persist() or merge() should be
>> necessary
>> to update an entity inside a persistent context. I tested with
>> Hibernate
>> and Amber as persistence providers and in both cases, nothing was
>> necessary. That was using Resin 3.1.5 and RESOURCE_LOCAL as
>> transaction
>> type, which means that the problem might be with the container
>> managed
>> transactions.
>>
>> S!
>> D.
>>
>> Daniel López escribió:
>>> AFAIK, using merge should not be necessary unless the entity has
>>> been
>>> updated outside a "persistent context" and then needs to be
>>> synchronised
>>> back with the DB contents. persist() is just for new entities so
>>> reading
>>> the docs, updating an entity inside a persistent context should
>>> require
>>> no action. Unless an exception is thrown, of course ;).
>>>
>>> I'm going to do some tests...
>>>
>>> S!
>>> D.
>>>
>>> Matt Johnston escribió:
>>>> I think you will need to use either the persist() or merge()
>>>> methods of
>>>> the EntityManager in order to save your data to the database. In
>>>> your
>>>> case since you are updating an existing record, you will need to
>>>> use:
>>>>
>>>> m_manager.merge(homeobj)
>>>>
>>>>
>>>> Matt
>>>>
>>>> Riccardo Cohen wrote:
>>>>> Hi
>>>>> I used to play with entity ejb with resin 3.0 with no problem.
>>>>> Now in
>>>>> 3.1.5 I have this code :
>>>>>
>>>>> @PersistenceContext(name="public") private EntityManager
>>>>> m_manager;
>>>>>
>>>>> public boolean set_homeinfo(int id_user,String title)
>>>>> {
>>>>> boolean success=false;
>>>>> Query hqr=m_manager.createQuery("select h from homeinfo h
>>>>> where
>>>>> h.id_user="+id_user);
>>>>> List<homeinfo> hitems = (List<homeinfo>)hqr.getResultList();
>>>>> if (hitems.size()==1)
>>>>> {
>>>>> homeinfo homeobj=hitems.get(0);
>>>>> System.out.println("title was "+homeobj.getTitle());
>>>>> homeobj.setTitle(title);
>>>>> success=true;
>>>>> }
>>>>> return(success);
>>>>> }
>>>>>
>>>>> The select works all right, but the "title" field is never
>>>>> modified. I
>>>>> added finer info on sql to see database requests in log, and
>>>>> there is no
>>>>> "update". Did I miss something ?
>>>>>
>>>>> I looked at the resin amber tutorials, but there are only "select"
>>>>> samples, I did not see "insert" and "update" samples... I remember
>>>>> problems like this with 3.0 when the entity bean was reused, it
>>>>> was not
>>>>> saved, but here it is not the case.
>>>>>
>>>>> Thanks for any help.
>>
>>
>>
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>>
>
> --
> Très cordialement,
>
> Riccardo Cohen
> -------------------------------------------
> Articque
> http://www.articque.com
> 149 av Général de Gaulle
> 37230 Fondettes - France
> tel : 02-47-49-90-49
> fax : 02-47-49-91-49
>
>
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