Code:
<hibernate-mapping package="sandbox">
<class name="person" table="PERSON">
<id name="id" />
<property name="name" />
<joined-subclass name="child" table="CHILD">
<key column="id" />
<bag name="certificates" table="CERTIFICATES" lazy="false"
fetch="subselect" cascade="all">
<key column="id" />
<composite-element class="Certificate" >
<property name="board" />
<property name="grade" />
</composite-element>
</bag>
</joined-subclass>
</class>
</hibernate-mapping>This does not scale very well, is there a way to reduce the queries. I have tried using different combinations of cascade/fetch/lazy etc, but have not managed to reduce the queries?
If I was to do this manually in jdbc I would query each table once and then add certificates to children:
For example:
Code:
List<Child> children = listChildren();
//map of certifcated by child id
Map<Integer,List<Certificate>> certs = listCertificates();
for(Child c: children){
c.addCertificates(certs.get(c.getId());
}Thanks
Chris