Hello Max,
thanks.
I think sequential ids will be a must in my case. It does not have to be for
a PK, but for non-pk is also fine.
I am creating a small multi-tenancy Accounting/HR application and when I
create employees, I am thinking of giving an employeeID for the employee.
In addition, I want to be able to specify the start range of the employeeID
also and add prefix for the start range
Looking into the following for a non-pk field.
@Persistent(valueStrategy = IdGeneratorStrategy.SEQUENCE)
Hopefully this will work for me.
Thanks
-Aswath
On Wed, Feb 10, 2010 at 10:42 AM, Max Ross (Google) <
maxr+appeng...@google.com <maxr%2bappeng...@google.com>> wrote:
> Hi Aswath,
>
> Unfortunately there is no way to guarantee the assignment of sequential ids
> using JDO on App Engine, or even using the low-level datastore api. This is
> because ids are allocated in batches across many datastore backends, and one
> request to get the next id may hit one backend while another may hit a
> different backend. Is sequential ids a hard requirement?
>
> Max
>
> On Tue, Feb 9, 2010 at 8:27 PM, aswath satrasala <
> aswath.satras...@gmail.com> wrote:
>
>> Hello Max,
>> I am planning to use IdGeneratorStrategy.INCREMENT feature to assign
>> sequential ids for entities I am creating. for example, Employee.
>>
>> -Aswath
>>
>> On Wed, Feb 10, 2010 at 5:49 AM, Max Ross (Google) <
>> maxr+appeng...@google.com <maxr%2bappeng...@google.com>> wrote:
>>
>>> JDO Sequences work, we just haven't publicized them. The DataNucleus
>>> docs should tell you everything you need to know:
>>> http://www.datanucleus.org/products/accessplatform/jdo/sequences.html
>>>
>>> IdGeneratorStrategy.INCREMENT is not yet implemented. What are you
>>> looking to use it for?
>>>
>>> Max
>>>
>>>
>>> On Mon, Feb 8, 2010 at 3:20 AM, Vincent TELLIER <
>>> tellier.vinc...@gmail.com> wrote:
>>>
>>>> I tried the incrementation, but I got an error saying that it was not
>>>> implemented in the appengine datastore.
>>>>
>>>>
>>>> TELLIER Vincent
>>>> + Email : cont...@tellier-vincent.eu
>>>> + Contact messenger (msn) : abs...@esugenus.fr
>>>>
>>>>
>>>> 2010/2/8 aswath satrasala <aswath.satras...@gmail.com>
>>>>
>>>> See if the following annotation help you.
>>>>> @Persistent(valueStrategy = IdGeneratorStrategy.INCREMENT)
>>>>>
>>>>> -Aswath
>>>>>
>>>>>
>>>>> On Mon, Feb 8, 2010 at 1:18 AM, datanucleus
>>>>> <andy_jeffer...@yahoo.com>wrote:
>>>>>
>>>>>> What getNextID feature on JDO ? i.e please make reference to the JDO
>>>>>> API and which particular API Method you're referring to
>>>>>>
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