can you give an example of how this is done?
currently, we use a <sql many-key ...> to relate from
parent to child as in (A has a 1 to n relationship to
B):
<class name="A" ....>
...
<field name="B" type="..." collection="vector" ...>
<sql many-key="a_id"/>
</field>
</class>
but we do not reference A in B anywhere. should we
use the <sql name=".."> in the mapping for B to do
this?
thanks,
chris
--- [EMAIL PROTECTED] wrote:
> Chris Williams wrote:
> >
> > as far as both our database and mapping.xml is
> concerned, no. how would one
> > make sure the relationship is bi-directional? i
> assume you are talking
> > about at the castor level.
> >
> > on 1/8/02 12:52 AM, Thomas Yip at [EMAIL PROTECTED]
> wrote:
> >
> > >
> > >
> > > Is the relationship a bi-directional
> relationship.
> > > Otherwise, make sure it is.
>
> Chris,
>
> There are two types of relationships in most object
> persistence tools,
> uni-directional and bi-directional. A
> uni-directional relation is one
> which objectA makes reference to objectB, but
> objectB does not make
> reference to objectA. A bi-directional relation is
> just the opposite -
> objectA refers to objectB and objectB refers to
> objectA.
>
> In most situations, Castor requires that relations
> be mapped as
> bi-directional. To do so, make sure that both sets
> of objects have
> references to each other. For example, if objectA
> has a one-to-many
> relation to objectB, objectB must have a many-to-one
> relation back to
> objectA.
>
> Bruce
>
>
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