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Posted to ojb-user@db.apache.org by Markus Brigl <mb...@gmx.net> on 2006/03/22 16:23:55 UTC
Mapping List's
Hi,
I have a problem with the mapping of List's. If I store the list to DB
and reload it the order of the objects are casual and not the same as I
inserted them in the List. Can I configure the repository file in some
way that OBJ stores even the indexes of the List?
Re: Mapping List's
Posted by Armin Waibel <ar...@apache.org>.
Hi Markus,
Markus Brigl wrote:
> Hi Armin,
>
> it didn't mean the order-by, which does an ordering related to an
> attribute. What I mean is the insert order in a list; if an object A
> has index 0 in the list I would expect it has the same index after
> fetching the list in a different transaction.
>
> At example with Hibernate it is possible to define a column, where the
> index of each object is stored; many JDO implementation do this without
> any required specification.
>
> Can I reach this target even with OJB?
>
Sorry, AFAIK this is currently not possible with OJB. Please make a
feature request in JIRA.
regards,
Armin
> regards
>
> Markus
>
> On Mon, 2006-03-27 at 11:51 +0200, Armin Waibel wrote:
>
>> Hi Markus,
>>
>> Markus Brigl wrote:
>>> Hi,
>>>
>>> I have a problem with the mapping of List's. If I store the list to DB
>>> and reload it the order of the objects are casual and not the same as I
>>> inserted them in the List. Can I configure the repository file in some
>>> way that OBJ stores even the indexes of the List?
>>>
>> Do you mean mapping of 1:n relations? In this case you can specify a
>> "order-by" element in the collection-descriptor to force ordering.
>> http://db.apache.org/ojb/docu/guides/repository.html#orderby
>>
>> regards,
>> Armin
>>
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>
>
>
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Re: Mapping List's
Posted by Markus Brigl <mb...@gmx.net>.
Hi Armin,
it didn't mean the order-by, which does an ordering related to an
attribute. What I mean is the insert order in a list; if an object A
has index 0 in the list I would expect it has the same index after
fetching the list in a different transaction.
At example with Hibernate it is possible to define a column, where the
index of each object is stored; many JDO implementation do this without
any required specification.
Can I reach this target even with OJB?
regards
Markus
On Mon, 2006-03-27 at 11:51 +0200, Armin Waibel wrote:
> Hi Markus,
>
> Markus Brigl wrote:
> > Hi,
> >
> > I have a problem with the mapping of List's. If I store the list to DB
> > and reload it the order of the objects are casual and not the same as I
> > inserted them in the List. Can I configure the repository file in some
> > way that OBJ stores even the indexes of the List?
> >
>
> Do you mean mapping of 1:n relations? In this case you can specify a
> "order-by" element in the collection-descriptor to force ordering.
> http://db.apache.org/ojb/docu/guides/repository.html#orderby
>
> regards,
> Armin
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
Re: Mapping List's
Posted by Armin Waibel <ar...@apache.org>.
Hi Markus,
Markus Brigl wrote:
> Hi,
>
> I have a problem with the mapping of List's. If I store the list to DB
> and reload it the order of the objects are casual and not the same as I
> inserted them in the List. Can I configure the repository file in some
> way that OBJ stores even the indexes of the List?
>
Do you mean mapping of 1:n relations? In this case you can specify a
"order-by" element in the collection-descriptor to force ordering.
http://db.apache.org/ojb/docu/guides/repository.html#orderby
regards,
Armin
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