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Posted to ojb-dev@db.apache.org by "Spräner, Carsten" <Ca...@viadee.de> on 2003/06/13 11:31:30 UTC
Anonymous Access and One Class One Table?
Hi,
some weeks ago thma wrotes in a posting that the feature of anonymous fields gives the posibility to use the "One Class One Table" inharitance strategy. I managed to get the howto-use-anonymous-fields to html and tried to understand it.IMHO anonymous fields are fields, which are only in the database and NOT in the object model. In the howto these are the IDs and FK-Fields. Making them anonymous tells OJB to handel the values on its own. (Assigning PKs and updating the FKs).
With this aproach it is possible to make the reference handling transparent to the Object domain.
But i have no idea how this can be used to manage inheritance???
Any help??
Thanx
carsten spraener
Re: Anonymous Access and One Class One Table?
Posted by Raymond Barlow <rb...@raymanoz.com>.
Hi Guys,
I am eagerly following this thread, as I too have had problems with
vertical inheritance, and am not sure if I was doing everything right.
One question about the tests that you are putting together, have you
included a test for searching for objects? I was having problems with
this in the past, and could never get it working (always
NullPointerException's). If there is a test (using extents) and it is
working, I would be very interested in having a look at it. If there
isn't a test, I think one should be written. I'd do it myself, but I
don't think I have a firm enough grasp of OJB concepts etc. to be
getting involved just yet.
Keep up the good work!
Regards,
Raymond Barlow
Thomas Mahler wrote:
> It's almost finished! Only hours away..
> There is already a fully working testcase in CVS:
> o.a.ojb.broker.AnonymousFieldTest
> This should get you started.
>
> cheers,
> Thomas
>
> Jakob Braeuchi wrote:
>
>> hi carsten,
>>
>> i did a little code-digging using the fine eclipse debugger, so i
>> think i partially understand what's going on in vertical inheritance.
>> but a docu woul reallly help. waiting for thomas ;)
>>
>> jakob
>>
>> Jakob Braeuchi wrote:
>>
>>> hi carsten,
>>>
>>> you're not alone :(
>>>
>>> jakob
>>>
>>> Spräner, Carsten wrote:
>>>
>>>> Hi,
>>>>
>>>> some weeks ago thma wrotes in a posting that the feature of
>>>> anonymous fields gives the posibility to use the "One Class One
>>>> Table" inharitance strategy. I managed to get the
>>>> howto-use-anonymous-fields to html and tried to understand it.IMHO
>>>> anonymous fields are fields, which are only in the database and NOT
>>>> in the object model. In the howto these are the IDs and FK-Fields.
>>>> Making them anonymous tells OJB to handel the values on its own.
>>>> (Assigning PKs and updating the FKs).
>>>>
>>>> With this aproach it is possible to make the reference handling
>>>> transparent to the Object domain.
>>>> But i have no idea how this can be used to manage inheritance???
>>>>
>>>> Any help??
>>>>
>>>> Thanx
>>>>
>>>> carsten spraener
>>>>
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
>>>> For additional commands, e-mail: ojb-dev-help@db.apache.org
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
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>>>
>>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
>> For additional commands, e-mail: ojb-dev-help@db.apache.org
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-dev-help@db.apache.org
>
>
Re: Anonymous Access and One Class One Table?
Posted by Thomas Mahler <th...@web.de>.
It's almost finished! Only hours away..
There is already a fully working testcase in CVS:
o.a.ojb.broker.AnonymousFieldTest
This should get you started.
cheers,
Thomas
Jakob Braeuchi wrote:
> hi carsten,
>
> i did a little code-digging using the fine eclipse debugger, so i think
> i partially understand what's going on in vertical inheritance.
> but a docu woul reallly help. waiting for thomas ;)
>
> jakob
>
> Jakob Braeuchi wrote:
>
>> hi carsten,
>>
>> you're not alone :(
>>
>> jakob
>>
>> Spräner, Carsten wrote:
>>
>>> Hi,
>>>
>>> some weeks ago thma wrotes in a posting that the feature of anonymous
>>> fields gives the posibility to use the "One Class One Table"
>>> inharitance strategy. I managed to get the howto-use-anonymous-fields
>>> to html and tried to understand it.IMHO anonymous fields are fields,
>>> which are only in the database and NOT in the object model. In the
>>> howto these are the IDs and FK-Fields. Making them anonymous tells
>>> OJB to handel the values on its own. (Assigning PKs and updating the
>>> FKs).
>>>
>>> With this aproach it is possible to make the reference handling
>>> transparent to the Object domain.
>>> But i have no idea how this can be used to manage inheritance???
>>>
>>> Any help??
>>>
>>> Thanx
>>>
>>> carsten spraener
>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
>>> For additional commands, e-mail: ojb-dev-help@db.apache.org
>>>
>>>
>>>
>>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
>> For additional commands, e-mail: ojb-dev-help@db.apache.org
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-dev-help@db.apache.org
>
>
Re: Anonymous Access and One Class One Table?
Posted by Jakob Braeuchi <jb...@gmx.ch>.
hi carsten,
i did a little code-digging using the fine eclipse debugger, so i think
i partially understand what's going on in vertical inheritance.
but a docu woul reallly help. waiting for thomas ;)
jakob
Jakob Braeuchi wrote:
> hi carsten,
>
> you're not alone :(
>
> jakob
>
> Spräner, Carsten wrote:
>
>> Hi,
>>
>> some weeks ago thma wrotes in a posting that the feature of anonymous
>> fields gives the posibility to use the "One Class One Table"
>> inharitance strategy. I managed to get the howto-use-anonymous-fields
>> to html and tried to understand it.IMHO anonymous fields are fields,
>> which are only in the database and NOT in the object model. In the
>> howto these are the IDs and FK-Fields. Making them anonymous tells
>> OJB to handel the values on its own. (Assigning PKs and updating the
>> FKs).
>>
>> With this aproach it is possible to make the reference handling
>> transparent to the Object domain.
>> But i have no idea how this can be used to manage inheritance???
>>
>> Any help??
>>
>> Thanx
>>
>> carsten spraener
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
>> For additional commands, e-mail: ojb-dev-help@db.apache.org
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-dev-help@db.apache.org
>
>
Re: Anonymous Access and One Class One Table?
Posted by Jakob Braeuchi <jb...@gmx.ch>.
hi carsten,
you're not alone :(
jakob
Spräner, Carsten wrote:
>Hi,
>
>some weeks ago thma wrotes in a posting that the feature of anonymous fields gives the posibility to use the "One Class One Table" inharitance strategy. I managed to get the howto-use-anonymous-fields to html and tried to understand it.IMHO anonymous fields are fields, which are only in the database and NOT in the object model. In the howto these are the IDs and FK-Fields. Making them anonymous tells OJB to handel the values on its own. (Assigning PKs and updating the FKs).
>
>With this aproach it is possible to make the reference handling transparent to the Object domain.
>
>But i have no idea how this can be used to manage inheritance???
>
>Any help??
>
>Thanx
>
>carsten spraener
>
>
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
>For additional commands, e-mail: ojb-dev-help@db.apache.org
>
>
>
>