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mchyzer
 Post subject: criteria projection should return the object itself
PostPosted: Mon Jun 12, 2006 3:33 am 
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Joined: Sat Jul 17, 2004 5:16 pm
Posts: 143
I am doing a criteria projection query which joins two tables. this is a little weird, but I also want the object of the original criteria. The only Projection I can see to use is a field of the original object, but not the object itself. I need a "this" or something keyword or new projection type. I see I can get the id of the object, but I would like the object itself.

Thanks,
Chris

ps. below I try to get the alias of the object, which says obviously it cant find the field...

Hibernate version:
3.1

Code between sessionFactory.openSession() and session.close():

Code:
      final ProjectionList projectionList = Projections.projectionList();
      projectionList.add(Projections.property("courtCase__"));
      projectionList.add(Projections.property("sub__.gender"));
      projectionList.add(Projections.property("sub__.race"));
      projectionList.add(Projections.property("sub__.dob"));
      projectionList.add(Projections.property("sub__.clientId"));

      List theResults = (List)HibernateHelper.callbackHibernateSessionUnchecked(new HibernateHandler() {

         public Object callback(Session hibernateSession) throws Exception {
            
            Criteria criteria = hibernateSession.createCriteria(CourtCase.class, "courtCase__");
            criteria.createCriteria("client", "sub__");
            criteria.setProjection(projectionList);
            //criteria.add(Restrictions.in("courtCase__", someList));
            return criteria.list();
         }
         
      });

Full stack trace of any exception that occurs:

testInitObjectFieldOneToMany(gov.me.bds.osa.drugcourt.util.HibernateHelperTest)org.hibernate.QueryException: could not resolve property: courtCase__ of: gov.me.bds.osa.drugcourt.model.CourtCase
at org.hibernate.persister.entity.AbstractPropertyMapping.throwPropertyException(AbstractPropertyMapping.java:43)
at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:37)
at org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1265)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getType(CriteriaQueryTranslator.java:476)
at org.hibernate.criterion.PropertyProjection.getTypes(PropertyProjection.java:36)
at org.hibernate.criterion.ProjectionList.getTypes(ProjectionList.java:38)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getProjectedTypes(CriteriaQueryTranslator.java:317)
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:69)
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:67)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1514)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
at gov.me.bds.osa.drugcourt.util.HibernateHelperTest$1.callback(HibernateHelperTest.java:104)
at gov.me.bds.osa.drugcourt.util.HibernateHelper.callbackHibernateSession(HibernateHelper.java:1219)
at gov.me.bds.osa.drugcourt.util.HibernateHelper.callbackHibernateSession(HibernateHelper.java:1183)

Name and version of the database you are using:
Oracle
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mchyzer
 Post subject:
PostPosted: Mon Jun 12, 2006 2:31 pm 
Senior
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Joined: Sat Jul 17, 2004 5:16 pm
Posts: 143
I found a workaround for this too doing SQL projections. I must say the SQL projections are pretty darn powerful.

The end result I needed was something like this:

Code:
projectionList.add(Projections.sqlProjection("{alias}.id theObj", new String[]{"theObj"},
      new Type[]{Hibernate.entity(CourtCase.class)}));


So I made a factory method to create these (not all code provided, but you get the idea)

Code:
   /**
    * generate a projection for the object in question
    * @param theClass
    * @return a projection
    */
   public static Projection thisObjectProjection(Class theClass) {
      //Projections.sqlProjection("{alias}.id theObj__", new String[]{"theObj__"},
      //      new Type[]{Hibernate.entity(CourtCase.class)}));
      String primaryKeyColumn = HibernateHelper.columnNamePrimaryKey(theClass);
      Projection projection = Projections.sqlProjection(
            "{alias}." + primaryKeyColumn + " theObj__", new String[]{"theObj__"},
                  new Type[]{Hibernate.entity(theClass)});
      return projection;
   }
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