Hi,

Suppose we have a table table_A and on object A mapped to that table, and imagine that the table has a large number of columns, so i want to recover a reduced version of A object with less attributes (less columns considered), say AReduced, but also keep the A object mapped to the table (i may need to get all columns). Is this possible? How can i tell hibernate which type of object to retreive? What happens with foreign keys to table_A? How is it represented in the hbm files?

Thanks in advance.

Yes it is possible.

Hibernate doesn't restrict to map one table by only one class. you can map multiple class to single table. (which is not recommended).

So you can create two classes which mapped to same table (for you classA and classAReduce). If you map all or partial column of the table.
So if you want only some selective column in classAReduct , then map only selective column to property . like

Thanks for your response,

What would happen if i need a FK from B object (mapping table_B) to table_A? In the B hbm mapping file i could make reference to only one of the objects: A or AReduced. Is that correct, isn't it?

Greets.

It depends upon you, whether you want to navigate to Object A or Object AReduce form Object B.

If you want to retrieve value of all the columns form table_a then use use Object A as a property in Class B.

Really appreciated your ratting on the post.