Not necessarily. You can define keys as your fields, and use lazy loading to
support the object links in CMP. For instance:
CMP_EB_Class
...
String contactId;
Contact contact = null;
Person.getContact()
{
if ( contact == null )
{
contact = ContactHome.getContact( contactId );
}
return contact;
}
and the obligatory set:
Person.setContact( Contact cont )
{
contact = cont;
contactId = cont.getId();
}
> Hi,
>
> When you say that I can put ContactInfo in a Person member, you mean
> to use BMP, don't you? To my understanding, it is impossible to use object
> as a member in CMP because it can not match a object with a field in the table.
>
> Please verify it for me.
>
> -John
>
> -----Original Message-----
> From: Juan Lorandi (Chile) [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, February 01, 2001 12:56 PM
> To: [EMAIL PROTECTED]
> Subject: Re: bean design problem for one to many relationship
>
> With this design, you could easily have 2 CMP beans that do just what you
> want.
> Alternatively, if contact info will only be accesible thru Person, you could
> store all ContactInfo
> in a Person member:
>
> (very PSEUDO pseudo-code)
> public class ContactInfo extends Object {
> public String UID;
> public String Type;
> public String Detail;
> }
>
> and in Person:
>
> ..
> public Vector contactInfoCollection;
> ..
>
> public addContact(ContactInfo contact);
> {
> contactInfoCollection.add(ContactInfo);
> }
>
>
> HTH
>
> JP
> > -----Original Message-----
> > From: Jianguo Wang [mailto:[EMAIL PROTECTED]]
> > Sent: Jueves, 01 de Febrero de 2001 14:42
> > To: [EMAIL PROTECTED]
> > Subject: bean design problem for one to many relationship
> >
> >
> > Dear friends,
> >
> > I have a design problem about one to many relationship. Can
> > anyone there give me
> > some suggestions,
> >
> > For simplicity's sake, let's say I have two tables
> > Person(UID, FirstName, LastName)
> > with primary key (UID) and ContactInfo(UID, Type, Detail)
> > with primary key (UID, Type).
> > A person may have more than one ContactInfo. For example,
> >
> > A record in the table "Person" is (777, John, Smith)
> > Corresponding to this person, there are two records in the
> > table "ContacInfo" like
> > (777, Email, [EMAIL PROTECTED])
> > (777, Phone, (850)123-4567)
> >
> > These information are provided at a time and can be saved in
> > array (mainly ContactInfo).
> > When I try to insert them into database, can I implement it
> > as CMP? or I have to
> > implement it as BMP? If I can do with CMP, does it mean that
> > I have to make a loop
> > to invoke home.create(UID, Type, Detail)?
> >
> > Thank you very much.
> >
> > -John
> >
>
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