This figure shows the mapping for a one-to-one relationship. A sample ejb-jar.xml file is shown with the following code:

<relationships>
...
<ejb-relation>
...
   <multiplicity>One</multiplicity>
   <relationship-role-source>EmpBean</relationship-role-source>
   <cmr-field>
      <cmr-field-name>address</cmr-field-name>
   </cmr-field>
...
</ejb-relation>
<ejb-relation>
...
   <relationship-role-source>AddressBean</relationship-role-source>
...
</ejb-relation>

A sample orion-ejb-jar.xml file is also shown, with the following code:

<entity-deployment name="EmpBean"...
<cmp-field-mapping name="address">
   <entity-ref home="AddressBean">
      <cmp-field-mapping name="address" persistence-name="addressPK" />
   </entity-ref>
</cmp-field-mapping>
...
</entity-deployment>
entity-deployment name="AddressBean"...
...
<cmp-field-mapping name="empNo">
   <entity-ref home="EmpBean">
      <cmp-field-mapping name="empNo" persistence-name="empno" />
   </entity-ref>
</cmp-field-mapping>
...
</entity-deployment>

There are three arrows in this illustration:

• From the <cmr-field-name>address</cmr-field-name> line in ejb-jar.xml to the <cmp-field-mapping name="address" persistence-name="addressPK" /> line in orion-ejb-jar.xml.

• From the <cmr-field-name>address</cmr-field-name> line in ejb-jar.xml to the <cmp-field-mapping name="address"> line in orion-ejb-jar.xml.

• From the <ejb-name>AddressBean</ejb-name> line in ejb-jar.xml to the <entity-ref home="AddressBean"> line in orion-ejb-jar.xml.

There is also a note pointing to the <cmp-field-mapping name="address" persistence-name="addressPK" /> line in orion-ejb-jar.xml indicating that this is the name of the database column for the foreign key.