Re: [eclipselink-users] Sequence generator - as a service

["Tim Hollosy" <hollosyt@xxxxxxxxx>]

So if you want eclipselink to run a query to get the value of your id
right? If so you could use the snippet I posted earlier. How you get
your nextval depends on your dbms though, not eclipselink.

./tch



On Wed, Aug 6, 2008 at 6:06 PM, Jan Vissers <Jan.Vissers@xxxxxxxxxx> wrote:
> Let me try and clarify.
>
> Basically I want to have an entity, say
>
>  @Entity
>  public class Master implements Serializable {
>      @Id
>      private long id;
>
>      public void setId(long id) {
>          this.id = id;
>      }
>  }
>
> For which the primary key will be created separately - in the most
> efficient way (like EclipseLink which caches a number of unique numbers
> from a sequence) - in order to set it later. The creation of the key value
> and the actual storage of the Master are not within the same persistency
> context.
>
> -J.
>
>
>
>
>> Well, it looks like you want to have eclipselink run some queries,
>> nothing strange there. Is there something I'm missing?
>>
>> ./tch
>>
>>
>>
>> On Wed, Aug 6, 2008 at 5:52 PM, Jan Vissers <Jan.Vissers@xxxxxxxxxx>
>> wrote:
>>> Might be a silly/hard to understand question...
>>>
>>> How would I use EclipseLink as a means to implement sequence block
>>> pattern? What I want to do is this:
>>>
>>>
>>> a. Remote client (Flex) calls Java service do so work, amongst others it
>>>   passes in an identifier (initially '0').
>>>
>>> b. Java service uses 'sequence block' to obtain next unique identifier
>>>   (not '0') when the passed in identifier is '0'. --> this would be
>>>   the place where I would want to use EclipseLink <--
>>>
>>> c. Java service performs requested work and returns the identifier,
>>> which
>>>   might have been not '0' in the first place i.e. passed in at a.
>>>   or initialized at b.
>>>
>>> d. Remote client (Flex) continues to call a. as long as there is work to
>>>   be done. If everything is completed continues with e.
>>>
>>> e. Remote client (Flex) calls into (another) Java service to 'finalize'
>>> the
>>>   operation. It passes in the not '0' identifier and other stuff.
>>>
>>> f. Java service uses not '0' identifier as the primary key (@Id) via
>>>   setId() of a record to be created.
>>>
>>> Now, let us first wait and see who understands what I'm trying to do
>>> here ;-)
>>>
>>> Thanks,
>>> Jan.
>>>
>>> _______________________________________________
>>> eclipselink-users mailing list
>>> eclipselink-users@xxxxxxxxxxx
>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>
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