hibernate one to many with 3 table

Posted on 2012-03-23
Medium Priority
Last Modified: 2012-06-08
table 1:collage
table 2: students
table 3 : teachers
one collage, multiple student and multiple teacher. how to do in hibernate one to many.
Question by:aaronyeo22
  • 2

Expert Comment

ID: 37757380
Here is interesting link, explanation

You use 2 different collections mapped in nHibernate to load/update the data from/to the data store and you create a 3rd collection that exposes the 2 internal collections. The third collection isn't a real collection -- it's just an implementation of the interfaces the client code will expect (IList, IEnumerable most likely). Actually, that's all a real collection is, my point is that it doesn't have its own data store.

If you look at my modificataions to the mapping example you provided, you'll notice that I renamed the one-to-many maps to give each a different name. So what you are doing is telling nHibernate to map it as if there are 2 tables (which there are) and telling the client that there is a single collection that acts as a factory to return the appropriate object type. You need to write the code in the middle that makes it appear to the client that there is a single collection.


public class InvoiceItems : IEnumerable, IList
  /* in the implementation, use the 2 internal collections
     as the data source for InvoiceItems.

I should also point out that it may be possible to do what you are trying to do in nHibernate without adopting my approach. I don't know enough about it to be able to say it isn't in there.


Accepted Solution

gudii9 earned 1000 total points
ID: 37757388

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