Manual Link and Unlink question

[Bradford Pielech]

Hello:
	This is a follow on to my question from last week where I have a graph 
structure where each graph node has a list of parents and children.  I was 
trying to use the auto-update=object and auto-delete=object features, but 
it was not working well in my particular scenario (meaning there were not 
any bugs in OJB) so I am investigating switching to auto-update and 
auto-delete = none and linking / unlinking on my own.

	So here is my question: if I have object A and object B already stored in 
the database, how can I create or delete an M to N link between them in 
their indirection table? I know that the BrokerHelper link and unlink 
methods are the way to go, but I cannot see how to use it because, to me, 
it looks like you can only specify 1 side of the link.

	Here is some rough sample code of what I want to do:
-----------
	PersistenceBroker pbroker = 
PersistenceBrokerFactory.defaultPersistenceBroker();
	pbroker.beginTransaction();
	pbroker.store(a);
	pbroker.commitTransaction();

        //then some time later
        pbroker.beginTransaction();
        pbroker.store(a);
        pbroker.commitTransaction();
	//and finally even later
	pbroker.serviceBrokerHelper().link(a,b); //I know this method doesn't 
exist, but this is what I want to do.
	//  or
	pbroker.serviceBrokerHelper().unlink(a,b);
-------------

Here is what the repository file for the DAGNode looks like:
<collection-descriptor
        name="children"
        element-class-ref="DAGNode"
        indirection-table="parent_children_table"
        auto-retrieve="true"
        auto-update="none"
        auto-delete="none"
    >
        <fk-pointing-to-this-class column="parent_id"/>
        <fk-pointing-to-element-class column="child_id"/>
    </collection-descriptor>
    <collection-descriptor
        name="parents"
        element-class-ref="DAGNode"
        indirection-table="parent_children_table"
        auto-retrieve="true"
        auto-update="none"
        auto-delete="none"
    >
        <fk-pointing-to-this-class column="child_id"/>
        <fk-pointing-to-element-class column="parent_id"/>
thank you!
Brad


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