Le lun 14/10/2002 à 17:10, Wendy Smoak a écrit :
> > PeristenceLayer pl = getPerstitenceLayer();
> > pl.save(domainObject);
> > But I'v read that the domain objects needn't know that are persitent,
> > if you implement a save method that means that ur object know it can be
> > persisted
>
> In that example, the domainObject still doesn't have to know if/how it's
> being persisted.
>
> I've implemented the whole DAO pattern, excepting the last bit that makes it
> easy to switch databases since it's highly unlikely that will happen here.
>
> In 'EditContactAction' I have:
>
> DAOFactory udFactory = DAOFactory.getDAOFactory();
> ContactDAO contactDAO = udFactory.getContactDAO();
> Contact contact = contactDAO.createContact();
>
> Later, in 'ProcessContactAction' there's:
>
> contactDAO.updateContact( contact );
>
> So while the Actions know that persistence is happening, they have no idea
> how it occurs.
>
so domainObject doesn't know about the DAO existence, and DAO's
represent ur persistence layer that is called into the struts action.
so if I can implement a generic DAO (that workd for all domain objects)
i will have
GenericDAO gd = // obtain a reference
Contact contact = session.getAttribute("contact");
gd.update(contact);
> --
> Wendy Smoak
> http://sourceforge.net/projects/unidbtags
--
Kevin Viet <[EMAIL PROTECTED]>
ActiVia Networks
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