Re: 1-1 Relationship with single FK ??

[Stefan Schl�sser]

Hi,

I totally agree to the TODO part ..

Unfortunately I am using a "Generic" access to my JavaBeans. The 
information for this is derived from the repository file itself. That 
means I have no way to detect that a 1 to 1 relationship was actually 
intended. Your approach is a good idea for a "standard" non-generic access.

Has anyone experiences with using foreign keys in both directions ?

Cheers,
  S.Schl�sser
Gelhar, Wallace Joseph wrote:

The workaround I have had to use is to create my JavaBean accessors such as this:

List item;

public Item getItem() {
        return item.get(0);
}
public void setItem(Item item) {
        item.set(0, item);
}
This still gives me type checking on the object and allows the FK to be on either entity on a 1-1 reference.

BTW...I would like to see this added to the TODO list.  A FK on a 1-1 relation should be allowed on either entity in the database.  This requires both of these forms to be valid:

<class-descriptor class="Foo" table="foo" >
...
<reference-descriptor name="bar" class-ref="Bar">
    <foreignkey field-ref="barID" />
</reference-descriptor>
...
</class-descriptor>
And

<class-descriptor class="Foo" table="foo" >
...
<reference-descriptor name="bar" class-ref="Bar">
    <inverse-foreignkey field-ref="fooID" />
</reference-descriptor>
...
</class-descriptor>
Thoughts?

Wally

-----Original Message-----
From: Stefan Schl�sser [mailto:[EMAIL PROTECTED] 
Sent: Thursday, April 29, 2004 5:49 AM
To: OJB Users List
Subject: 1-1 Relationship with single FK ??

Hi,

I would like to model a one-to-one Relationship between 2 classes.

For simplicity I would like to have a single FK in one of the classes 
only. Unfortunately OJB does not allow the definition of an 
"inverse-foreign-key" within the reference descriptor.

How do I solve this ? I don't wish to have a List in one of the classes, 
  I prefer the type-safe using a single Object.

If I had 2 fk's what happens upon update on one of the objects ? Which 
setting do I need to take to ensure consistency of both fks? I.e. update 
only the other classes fk but leave other fields untouched?

Thanks for any help on this, by the way I am using CVS head.

Cheers
   S.Schl�sser
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