Hibernate version: 3.1.1
Name and version of the database you are using: Oracle 9i


I have a class that implements two differents interfaces..... I want to know how to do the mapping in this case.



public class Document implements IPrintable, IExportable {
..
..
}


Thank.

Are you saying you have two tables (TABLE_PRINTABLE and TABLE_EXPORTABLE), and you want to map both to a single Java class?

Or are you saying that you have a Java class that implements two different interfaces, and maps to a single table (TABLE_DOCUMENT)?

In the first case, take a look at joined-subclass element of the Hibernate mapping file (hbm.xml).

In the second case, nothing special needs to be done. Hibernate deals with tables, so you can map whatever fields from Document to your Oracle table as you see fit.

HTH,

Bratek

Thank you for your answer, it's ok. Our case is the second one.

Now, supose that you have:


public class Document implements IPrintable {
..
..
}

public class Template implements IPrintable {
..
..
}

public class Link {
..
private IPrintable printable;
..
}



And the new question is: How to map the class Link?.

Hello Lucas,

please read the hibernate reference one time cross over. This is a typical standard mapping. (components).

Regards Sebastian

What I would suggest you do instead is take a look at this page:

http://www.hibernate.org/hib_docs/tools/ant/index.html

Then use hibernatetool <hbm2hbmxml> ant task to import hibernate mapping from an existing db schema (I'm assuming you're working with an existing database - if not, there is another tool to create the db from your Java objects, but I've never tried it).
That way you will see what Hibernate thinks of your mappings (mappings for all tables will be generated for you), and you will have a good start on tweaking those. It's much easier than writing all mappings from scratch, especially if you have many tables.

I would let Hibernate import your schema first. And then use another Hibernate task to create Java objects from mappings (<hbm2java>). That way you will see what Java classes are created by codegen. It could be that it might be better to place Link inside Document and Template, not the other way around.

HTH,

Bratek