hi there,
i have problems with my bidrectional 1:m mapping. Assume the follwing:

I have an entity 'Class' and an entity 'Relation'.
'Relation' has a 'LeftClass' and a 'RightClass'. How do I write the mapping for 'Class' if I want to access all Relations, thus meaning all 'Relation'-entities that have this 'Class' as 'LeftClass' or as 'RightClass'.

my mapping so far:
'Class.hbm.xml'
...
<set
name="Relations"
lazy="true"
inverse="true"
cascade="save-update"
>
<key
column="WHAT GOES HERE??"
/>
<one-to-many
class="org.xinity.base.devtools.BlueprintRelation"
/>
</set>
...

'Relation.hbm.xml'
...
<!-- LEFTCLASS -->
<many-to-one
name="leftClass"
class="org.xinity.base.devtools.XBOBlueprint"
cascade="save-update"
outer-join="auto"
update="true"
insert="true"
column="LEFT_BLUEPRINT_FK"
/>


<!-- RIGHTCLASS -->
<many-to-one
name="rightClass"
class="org.xinity.base.devtools.XBOBlueprint"
cascade="save-update"
outer-join="auto"
update="true"
insert="true"
column="RIGHT_BLUEPRINT_FK"
/>
...

thanks for help
marie

Read this documentation and examples in the hibernate doc

http://www.xylax.net/hibernate/

thanks.
but I can't get any help from this documentation, my problem is not a simple mapping but a maping with two key-columns. 'Class' is connected to 'Relation' by 'Relation.LeftClass' and 'Relation.RightClass'. I can access those two connected Classes from within 'Relation' but I can't access the Relations from within 'Class'.

Class (1) --- (many) Relation (many) --- (1) Class

Relation.getLeftClass(); [works fine]
Relation.getRightClass(); [works fine, too]
Class.getRelations(); [here is the Problem!]

I would have to do s.th. like:
[Class.hbm.xml}
<set name="Relations" lazy="true" inverse="true" cascade="save-update" >
<key column="RIGHT_CLASS_FK" />
<key column="LEFT_CLASS_FK" />
<one-to-many class="org.xinity.base.devtools.BlueprintRelation" />
</set>

but that does not work (of course).

any ideas?
thanks
marie

Ok so you have a many to many relationship between your 2 entities isnt'it?
So use a composite id or composite element to manage these two foreign keys