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Re: Designing a OO database model
On Thu, 23 Mar 2000, Jon Finanger wrote:
> Since OODB is pretty new, some questions arise regarding to the design of OO
> database model:
> Since Ozone uses RMI one need to work with interfaces (to create the
> proxies). Am i right when i say that if you're going to make an inheritance
> hierarchy like this: Emplyee inherits from Person
> you have to do it using interface inheritance?
>
> or do i just implement a PersonContainer interface and uses a
> setPerson(Person p) method in that to store a serializable Employee object
> or some other Person?
>
> or have i completely misunderstood :)
I've enhanced the simple sample from the distro a bit. I hope it shows now how
to handle a (simple) inheritance hierarchy:
public interface Auto extends OzoneRemote {
public void print();
public void setName (String newName);
public String name();
public Auto doSomthing (Auto auto) throws Exception;
}
public class AutoImpl extends OzoneObject implements Auto {
public AutoImpl() {
}
...
}
public interface Bus extends Auto {
}
public class BusImpl extends AutoImpl implements Bus {
public BusImpl() {
}
public String toString() {
// System.out.println ("toString()...");
return "Bus:" + name + ", " + String.valueOf(age) + ", " + capacity;
}
}
Client.java:
...
Bus bus = (Bus)db.createObject (BusImpl.class.getName());
System.out.println ("bus:" + bus);
bus.print();
bus.setName ("name");
db.deleteObject (bus);
....
Falko
--
______________________________________________________________________
Falko Braeutigam mailto:falko@softwarebuero.de
softwarebuero m&b (SMB) http://www.softwarebuero.de