I have a question for refresh a collection.
In my program, I first read some data from database by
session.createQuery("from GroupRelation").list();

Then, I make some insert into the GroupRelation table by session.save(object). However, I find I must requery the table, then I can find the insert result in the collection. Otherwise, even I used flush()/refresh(object) or load(), they can not make the inserted object in the collection.

Is there any other way can make the collection has the same content with database table?

When encountering much problems with synchronizing the cache like here, maybe consider calling session.clear() at least once?

Oh, sorry, I reread more cautiously what you said. You want Hibernate to update dynamically a collection because you inserted something into the corresponding table?

IMO, it's only possible if you have not triggered the collection loading yet (in case it's lazy-loaded).

If already loaded, you're forced to redo your query.

Thanks for your reply. I think I did not describe my question clear.

I mean that I first load the collection, then I save/delete some object, but I did not insert/remove the object from the collection.

For example, for save(object), after I execute the save(), and flush(). At this time, the table in database has been inserted for this object. However, the collection in memory has not such object in it.

I want to know except I reload the entire the collection, is there any other way to refresh the collection? since if I just use load(class, objectID), I can just load the object and it is not in the collection ( I must insert it into the list manually).

http://www.hibernate.org/hib_docs/v3/api/org/hibernate/Session.html#refresh(java.lang.Object)

This is not what I want.
Use refresh(), it can not read the specific object from database into memory. However, in the collection (I read into memory before), which is still does not contain the new inserted object. I want some way to read this new object into the collection, that means refresh the collection. I can not refresh the collection directly, like refresh(collection)

refeshing the object would refresh the collection on it ..( check ur cascade mapping )

I think you misunderstand me. The collection is not an component of the object. It is a collection that includes the object. For example, I have a Students class, the collection is the query result of all the students. Once I add a new student instance into database, the new student does not appear in the collection of students, even I refresh the new student instance.

So, if I sum up.

You do something like that :


If this is it, sorry but it's impossible. You'll have to rerun the first query :-).

Yes. This is waht I want.