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Author Message
 Post subject: Many-To-Many Relation bi-directional <delete error>
PostPosted: Fri Feb 26, 2010 10:13 am 
Newbie

Joined: Mon Mar 26, 2007 10:48 am
Posts: 13
Hi guys - i've a big problem.

I have 3 tables - personal - missions - personal_missions.

many-to-many - mission could have many personals and personals could be in a lot of missions....

Personal.hbm.xml
Code:
class name="com.dol.Personal" table="personal">
   <id name="personalId" column="personalId" type="java.lang.Integer"/>
   <bag name="missions" table="personal_mission" inverse="true">
      <key column="personalId"/>
      <many-to-many column="missionId" class="com.dol.Mission" />
   </bag>
</class>

Mission.hbm.xml
Code:
<class name="com.dol.Mission" table="mission">
   <id name="einsatzId" column="missionId" type="java.lang.Integer"/>
   <property name="desc" column="desc" type="java.lang.String" />
        <bag name="personal" table="personal_mission">
      <key column="missionId"/>
      <many-to-many column="personalId"  class="com.dol.Personal"/>
   </bag> 
</class>


Now with my entityManager - there are two methods - (addPersonalToMission and removePersonalFromMission).

Code:
public boolean addPersonalToMission(int personalId, int missionId){
               boolean ret = false;
          startOperation();
          Personal personal = (Personal) session.load(Personal.class, personalId);
          Mission mission = (Mission)session.load(Mission.class, missionId);
          if(!personal.getMissions().contains(mission))
          {
             mission.getPersonal().add(personal);
             ret = true;
          }
          session.save(mission);
          session.getTransaction().commit();
               return ret;
    }


In Both domainObjects (Personal.java and Mission.java) there are java.util.List which saves the parent.

The adding/removing works with this configurations - but when i change a mission (edit the description), then all assignments in the table personal_mission are deleted.... like cascading or so..

Does anyone know why this happen? it must be possible to edit a mission without consequences....

lg
triple

ps: Before this i tried another scenario:

i changed the configuration of Mission.hbm.xml and set inverse=true - so personal and mission has the inverse=true attribute.. so editing is possible - but adding a personal to mission or inversly isn't possible....

I know, one side must have the control .. but is there any possible solution?

i update the mission with following code:
Code:
public void updateMission(Mission newMission) throws Exception
   {
        try {
           closeOpenSession();
            startOperation();
            session.update(newMission);
            tx.commit();
        } catch (Exception e) {
         if (tx != null && tx.isActive())
            tx.rollback();
         throw e;
        }
    }


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