Polymorphism in Components

theaim · **Joined:** Tue Mar 15, 2005 5:04 am **Posts:** 26

Hello,
I have a class called Process that contains an Account. This Accountdata is part of the Processtable. So I made up a Component.

When I create an Process, I load an Account from the Database an put it into the Process. This way, i copie the Accountdata into the Process for history-reasons.

Now I have the Problem, that the Account I am puttint into the Process can either be DAccount or any subclass OR KAccount or any subclass.

After saving the Process, the information of which class this Account was has gone.

Is there any way to keep that Classinformation. For example the same way as it is done with the Discriminator in ClassMapping?

Thx,
Alexander

Hibernate version:3.1

Mapping documents:

Code:

<hibernate-mapping>
   <class name="de.datentraum.allrounder.Processes.Process" table="process" abstract="true" discriminator-value="PROC">
      <id name="id" type="int" column="process_id" unsaved-value="0">
         <generator class="sequence">
            <param name="sequence">uid_process</param>
         </generator>
      </id>
      <discriminator column="disc"/>
      <property name="strMemo" column="memo" type="text"/>
      <set name="documents">
            <key column="process_id"/>
            <one-to-many class="de.datentraum.allrounder.Processes.Document"/>
      </set>
      <component name="account" class="de.datentraum.allrounder.BaseClasses.Account" lazy="false">
         <property name="accountnumber"/>
         <property name="id" column="account_id"/>   
         <property name="condition" column="accountcondition" type="int"/>
         <many-to-one name="partner" column="partner_id" class="de.datentraum.allrounder.BaseClasses.Partner" />
      </component>
      <subclass name="de.datentraum.allrounder.Processes.DProcess" discriminator-value="DPRO">
      </subclass>
      <subclass name="de.datentraum.allrounder.Processes.KProcess" discriminator-value="KPRO">
      </subclass>
   </class>
</hibernate-mapping>

pksiv · **Posted:** Thu Oct 20, 2005 9:39 am

Does your account Table have a type column or some column indicting that it's a KAccount or whatever ? If so, just map this column as a attribute in your component.

theaim · **Joined:** Tue Mar 15, 2005 5:04 am **Posts:** 26

Yes, it Does.
When I load the accounts they will be from the correct Class.

But when I load the Process, the account will not be loaded from its origin Table. The data is stored for this process in the Processtable.(as a copy)

And now, hibernate initiates the Account class. But I need the Subclass.

regards,
Alexander