i probably don't understand the documentation, but i thought that whenever you ask hibernate to fetch an object from the DB it checks whether this object is already loaded in memory, and if it already is, it returns the already loaded object, right?
If i understand it correctly, that is certainly valid within the same session...
Sessions have a lifetime that is about the same as a transaction, right?
I have the following code to load all instances of the tyê Onderwerp into memory (very short list, will never grow beyond 200 objects)
Code:
public List<Onderwerp> getAllOnderwerpen(){
Criteria criteria = sessionFactory.getCurrentSession().createCriteria(Onderwerp.class);
List<Onderwerp> onderwerpList = criteria.list();
return onderwerpList;
}
if i load this in session1 i get a certain collection.
if i load this in session1 i get a different collection.
i want to delete some object from the DB.. how to proceed? I get a NonUniqueObjectException when calling
Code:
public Boolean deleteOnderwerp(Onderwerp onderwerp) {
Transaction tx = sessionFactory.getCurrentSession().beginTransaction();
try{
sessionFactory.getCurrentSession().delete(onderwerp);
tx.commit();
return true;
}
catch(HibernateException hibex){
tx.rollback();
log.debug(hibex.getMessage(),hibex);
return false;
}
}
Should i
1. Use some caching of my own inbetween, like:
Code:
private List<Onderwerp> myOnderwerpList;
public List<Onderwerp> getAllOnderwerpen(){
if (myOnderwerpList==null){
Criteria criteria = sessionFactory.getCurrentSession().createCriteria(Onderwerp.class);
onderwerpList = criteria.list();
}
return onderwerpList;
}
thereby also modifying this collection when deleting objects?
2. Invoke some arcane hibernate magic ?
Like.. uhm...
enlighten me please...
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