Re: JDO inheritence

[Thomas Mahler]

Hi Stephan,

In mapping an inheritance hierachy is not different for OJB/JDO. So if 
you mapping is correct everything should work fine.

I've some questions regarding your classes and mapping:

Stephan Wannenwetsch wrote:
Hallo,

I'm trying to store an object which inherits some attributes from a
superclass, but values are only be inserted in the subclass table an
nothing is inserted in the superclass table.
Objectmodel:
Class BusinessPartner()
 Integer bpid;
 String attribute
Can't find "attribute" in the jdo file and in the repository?
where are the other attributes Bpid, Adress and Name?
do you really start your attribute names with upper case letters as 
suggested by the .jdo and the repository.xml?

Class Individual extends BusinessPartner()
 String oneMoreAttribute;
cant't find this attribute in the JDO file and the repository?

in this class the attributes seem to start with lower case letters 
(fk_bpid, gender)?

Can you please post the exact layout of BusinessPartner and Individual.
Please also post the log file and any error messages you get.
thanks,
thomas
To get it a little bit more complicated I use the JDO plugin my
JDO-Files look as follows:
==> Individual.jdo
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jdo PUBLIC "-//Sun Microsystems, Inc.//DTD Java Data 
Objects Metadata 1.0//EN"
"http://java.sun.com/dtd/jdo_1_0.dtd";>
<jdo>
  <package name="demo.myshop.model.ojb">
    <class name="Individual"
persistence-capable-superclass="demo.myshop.model.ojb.BusinessPartner">
    	<field name="fk_bpid" persistence-modifier="persistent"></field>
    	<field name="gender" persistence-modifier="persistent"></field>
    </class>
  </package>
</jdo>

==> BusinessPartner.jdo
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jdo PUBLIC "-//Sun Microsystems, Inc.//DTD Java Data 
Objects Metadata 1.0//EN"
"http://java.sun.com/dtd/jdo_1_0.dtd";>
<jdo>
  <package name="demo.myshop.model.ojb">
    <class name="BusinessPartner" identity-type="datastore">
      	<field name="Bpid" persistence-modifier="persistent"></field>
      	<field name="Adress" persistence-modifier="persistent"></field>
      	<field name="Name" persistence-modifier="persistent"></field>
    </class>
  </package>
</jdo>

The Repository.xml looks as follows:

    <class-descriptor
    	class="demo.myshop.model.ojb.BusinessPartner"
    	table="OJB_BUSINESSPARTNER">
    	<field-descriptor
    		name="Bpid"
    		column="BPID"
    		jdbc-type="INTEGER"
    		primarykey="true"
    		autoincrement="true"/>
    	<field-descriptor
    		name="Adress"
    		column="ADRESS"
    		jdbc-type="VARCHAR"/>
    	<field-descriptor
    		name="Name"
    		column="NAME"
    		jdbc-type="VARCHAR"/>
    </class-descriptor>
    
   <class-descriptor
   	class="demo.myshop.model.ojb.Individual"
   	table="OJB_INDIVIDUAL">	
   <field-descriptor
   		name="fk_bpid"
   		column="FK_BPID"
   		jdbc-type="INTEGER"
   		primarykey="true"
   		autoincrement="true"/>
   	<field-descriptor
   		name="gender"
   		column="GENDER"
   		jdbc-type="VARCHAR"/>
   	<reference-descriptor name="super"
  	     class-ref="demo.myshop.model.ojb.BusinessPartner">
         	<foreignkey field-ref="fk_bpid" />
        </reference-descriptor>
    </class-descriptor>

The source code:
        //Individual Testdata
        Individual ind0 = new Individual();
        ind0.setAdress("Adress IND0");
        ind0.setName("Name IND0");
        ind0.setGender("male");
        t.begin();
        pm.makePersistent(ind0);
        t.commit();
So the problem was that there is only an entry in the OJB_INDIVIDUAL
table an none in the OJB_BUSINESSPARTNER table.
I hope someone can help me !

Thanks,
Stephan
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