Re: extent problem

[Thomas Dudziak]

Joose Vettenranta wrote:
Hi,
everything else except SuperChild is in http://joose.iki.fi/ojb/
SuperChild.java I already pasted.
repository.xml:
<descriptor-repository version="1.0" isolation-level="read-uncommitted">
        <jdbc-connection-descriptor jcd-alias="test"  
default-connection="true" platform="PostgreSQL"  
subprotocol="postgresql">
                <sequence-manager  
className="org.apache.ojb.broker.util.sequence.SequenceManagerNextValImp 
l"/>
        </jdbc-connection-descriptor>
        <class-descriptor class="net.vettenranta.Parent" table="PARENT">
                <field-descriptor name="id" primarykey="true"  
nullable="false" default-fetch="true" autoincrement="true" 
column="ID"  sequence-name="parent_id_seq" jdbc-type="INTEGER"/>
                <field-descriptor name="name" default-fetch="true"  
column="NAME" jdbc-type="VARCHAR"/>
                <collection-descriptor name="childs"  
element-class-ref="net.vettenranta.Child" auto-retrieve="true"  
auto-delete="true" auto-update="true">
                        <inverse-foreignkey field-ref="parent_id"/>
                </collection-descriptor>
        </class-descriptor>
        <class-descriptor class="net.vettenranta.Child" table="CHILDS">
                <field-descriptor name="id" primarykey="true"  
nullable="false" default-fetch="true" column="ID" jdbc-type="INTEGER"  
autoincrement="true" sequence-name="childs_id_seq" />
                <field-descriptor name="parent_id" nullable="false"  
default-fetch="true" column="PARENT_ID" jdbc-type="INTEGER"  
access="anonymous"/>
                <field-descriptor name="name" default-fetch="true"  
column="NAME" jdbc-type="VARCHAR"/>
                <reference-descriptor name="parent"  
class-ref="net.vettenranta.Parent">
                        <foreignkey field-ref="parent_id" />
                </reference-descriptor>
             <extent-class class-ref="net.vettenranta.SuperChild" />
        </class-descriptor>

       <class-descriptor class="net.Vettenranta.SuperChild"  
table="CHILDS">
                <field-descriptor name="age" default-fetch="true"  
column="AGE" jdbc-type="INTEGER"/>
       </class-descriptor>
</descriptor-repository>
You have to specify the extent-class as the first sub-tag of 
class-descriptor (see 
http://db.apache.org/ojb/docu/guides/repository.html#class-descriptor 
for details).
Also, you have to duplicate all fields/references/collections from Child 
in SuperChild, currently they are not automatically 'inherited' in the 
descriptor of the sub class.

I would recommend that you use the OJB and JDO Xdoclet modules (OJB 
module is part of OJB, the JDO module can be downloaded from 
http://xdoclet.sourceforge.net/xdoclet/index.html) to generate these two 
files, they will make things a lot easier for you.

Tom
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