I'd like to use hibernate without changing current code (inherited from an old project !) :
I have 3 classes :

public class DBObject{ // not associated to a database table
protected Oid oid;
//......
}

public class Patient extends DBObject{ associated to table'PATIENT'
//......
}

public class Oid{ // not associated to a database table

public Oid(String highLow) {
//.....
}
}


My problem is with the oid field : in the old configuration it was used as an identifier of the patient object and was saved as a string to PATIENT.ID column. What would be the best way to configure the Patient.hbm.xml since the DBOBject class is not mapped to a db table!

Thank u