Hi,
ABOU LINA wrote:
Hi,
i give you this sample example :
in case A<---->B [1:n] :
the mapping of this bidiractional navigation is guaranted by the use of
inverse-foreignkey :
Mapping A classe :
----------------------------------------------------
<collection-descriptor
name="allB"
element-class-ref="B"
>
<inverse-foreignkey field-ref="aId"/>
</collection-descriptor>
Mapping B class :
------------------------------
<reference-descriptor
name="a"
class-ref="A"
>
<foreignkey field-ref="aId"/>
</reference-descriptor>
so in case of A<---->B [1:1] i need a bidirectional navigation !!!!!
how to use ????
Do you mean how to map it?
Declare in both classes A and B a 1:1 reference-descriptor (both class
tables need a FK column).
How to insert?
This depends strongly on the used auto-xxx settings. If
auto-update/delete is enabled (and PK values handled by OJB) you can do
e.g.:
broker.beginTransaction();
// first store both objects
broker.store(a, ObjectModification.INSERT);
// or let OJB detect the needed operation (more overhead)
//broker.store(a);
broker.store(b, ObjectModification.INSERT);
// now set references
a.setRelatedB(b);
b.setRelatedA(a);
// update both
broker.store(a, ObjectModification.UPDATE);
broker.commitTransaction();
or ()
// set references first
a.setRelatedB(b);
b.setRelatedA(a);
broker.beginTransaction();
// store both objects
broker.store(a);
// update b to force OJB to set the FK
// back to a (was 'null' after first store call)
broker.store(b);
broker.commitTransaction();
or if auto-update 'link' is used
broker.beginTransaction();
// first store both objects
broker.store(a, ObjectModification.INSERT);
broker.store(b, ObjectModification.INSERT);
// now set references
a.setRelatedB(b);
b.setRelatedA(a);
// update both
broker.store(a, ObjectModification.UPDATE);
broker.store(b, ObjectModification.UPDATE);
broker.commitTransaction();
...
regards,
Armin
my config :
1. ojb 1.0.3
2. i use the broker (PB-API)
Thanks a lot ....
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