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Posted to ojb-user@db.apache.org by ABOU LINA <am...@gmail.com> on 2006/03/07 20:23:10 UTC
NESTED OBJECT 1:n is possible ???
How can i use nested object in case of 1:n ?? it s possible in OJB
Re: NESTED OBJECT 1:n is possible ???
Posted by Armin Waibel <ar...@apache.org>.
Hi,
ABOU LINA wrote:
> So first thank a lot for your helpful reply ,
>
> example :
>
> Class A {
>
> long id;
> B bObject;
>
> }
>
> Class B {
>
> String name
> String phone;
> }
>
> In TABLE A :
> -----------------------------------
> BIGINT id;
> STRING name;
> STRING phone;
>
>
> in this case we can use nested object in order to encapsulate field name
> and phone from table A in Class B. ok .
>
>
> but in case of 1:n :
> -------------------------------
>
> Class A {
>
> long id;
> Collection bObjects; [Collection of B].
>
> }
>
> so my question is possible to use nested objects , if yes how can i use it
> ????
>
No, because "nested objects" and a 1:n reference are completely
different concepts. In the first case a "nested object" is used to group
data of one table. In the second case you have two different tables A
and B with a 1:n reference between A and B.
regards,
Armin
>
> thank in advance.
>
>
>
>
> On 3/8/06, Armin Waibel <ar...@apache.org> wrote:
>> ABOU LINA wrote:
>>> How can i use nested object in case of 1:n ?? it s possible in OJB
>>>
>> Sorry, I don't understand your question. In OJB nested objects can be
>> used "group" and encapsulate fields of persistent objects.
>>
>> http://db.apache.org/ojb/docu/guides/advanced-technique.html#Nested+Objects
>>
>> Could you describe more detailed what you mean.
>>
>> regards,
>> Armin
>>
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>> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
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>>
>>
>
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Re: NESTED OBJECT 1:n is possible ???
Posted by ABOU LINA <am...@gmail.com>.
So first thank a lot for your helpful reply ,
example :
Class A {
long id;
B bObject;
}
Class B {
String name
String phone;
}
In TABLE A :
-----------------------------------
BIGINT id;
STRING name;
STRING phone;
in this case we can use nested object in order to encapsulate field name
and phone from table A in Class B. ok .
but in case of 1:n :
-------------------------------
Class A {
long id;
Collection bObjects; [Collection of B].
}
so my question is possible to use nested objects , if yes how can i use it
????
thank in advance.
On 3/8/06, Armin Waibel <ar...@apache.org> wrote:
>
> ABOU LINA wrote:
> > How can i use nested object in case of 1:n ?? it s possible in OJB
> >
>
> Sorry, I don't understand your question. In OJB nested objects can be
> used "group" and encapsulate fields of persistent objects.
>
> http://db.apache.org/ojb/docu/guides/advanced-technique.html#Nested+Objects
>
> Could you describe more detailed what you mean.
>
> regards,
> Armin
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>
Re: NESTED OBJECT 1:n is possible ???
Posted by Armin Waibel <ar...@apache.org>.
ABOU LINA wrote:
> How can i use nested object in case of 1:n ?? it s possible in OJB
>
Sorry, I don't understand your question. In OJB nested objects can be
used "group" and encapsulate fields of persistent objects.
http://db.apache.org/ojb/docu/guides/advanced-technique.html#Nested+Objects
Could you describe more detailed what you mean.
regards,
Armin
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