Well, here's an example of a parent-child 1->N relationship:
A has a Set member field of type B
The class outlines are:
public interface A extends EJBObject
{
public Set getB() throws RemoteException;
...
}
public interface B extends EJBObject
{
...
}
public class AEJB implements EntityBean
{
public static final Class b_types = B.class; //required by Orion I think
public Set b;
public Set getB()
{
return b;
}
...
}
public class BEJB implements EntityBean
{
...
}
That models the relationship using entity beans and CMP
Next you'll need to specify all this in the ejb-jar.xml, here are the
relevant sections:
<ejb-jar>
<enterprise-beans>
<entity>
<!-- all attributes for bean A -->
<cmp-field>
<description>A set of B</description>
<field-name>b</field-name>
</cmp>
</entity>
<!-- rest of ejb-jar file, with attributes for entity B -->
</enterprise-beans>
<relationships>
<ejb-relation>
<ejb-relation-name>A-B</ejb-relation-name>
<ejb-relationship-role>
<ejb-relationship-role-name>
a-has-b
</ejb-relationship-role-name>
<multiplicity>one</multiplicity>
<role-source>
<ejb-name>A</ejb-name>
</role-source>
<cmr-field>
<cmr-field-name>b</cmr-field-name>
<cmr-field-type>java.util.Set</cmr-field-type>
</cmr-field>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>
b-belongsto-a
</ejb-relationship-role-name>
<multiplicity>many</multiplicity>
<role-source>
<ejb-name>B</ejb-name>
</role-source>
</ejb-relationship-role>
</ejb-relation>
</relationships>
</ejb-jar>
When you deploy this, Orion will automatically create all the appropriate
entries in orion-ejb-jar.xml, including datasource, database field
and table names, and so on. You can then tweak it further to fit your
needs. I hope you find this helpful...
Hani
On Mon, 13 Nov 2000, Juan Gargiulo wrote:
> Hi,
>
> I'm having problems configuring orion to create the tables for entity EJBs
> with references to other entity EJBs (using CMP). Can somebody, please,
> enumerate the steps for doing this.
>
> Thanks in advance,
>
> Juan Gargiulo
>
>
>
