hibernate class mappings

One table per class:
        primary to primary
        mapping using column
        data in all tables for class as designed


One table per Class hierarchy
        one table overall
        value selection based on discriminator
        unnormalised form of data

One table per concrete class with abstract
        abstract table implemented as empty
        concrete implementing classes have common fields
        set abstract as ttue to prevent any data entry to the class
        polymorphism as implicit to make the mapping through hibernate layer
        data access through abstract object

One to many
        use of foreign primary keys
        key column sets relation
        one to many relation to be specified
        makes auto mapping

One to one
        indirect transform by specifying unique constraint
        linked linking for updation
        resolved simplicity

go to following link to access hibernate docs

http://www.dil.univ-mrs.fr/~massat/docs/hibernate-3.1/api/