RE: [Objectbridge-developers] Object References

[Bischof, R. <rai...@ed...>]

Thomas,

I strongly support this request although its too late for our project =
;-(

This manual coding introduces a new point of failure where simple typos =
can
cause you hours to identify: You have a persistent object with =
references
that looses it's references when re-loaded from the DB. The first thing =
you
do is check your mapping file but you will probably not check the =
setter
methods for the ID and reference IDs.=20

Thanks

Rainer Bischof


> -----Original Message-----
> From: Mahler Thomas [mailto:tho...@it...]
> Sent: Montag, 24. September 2001 15:48
> To: 'Charles Anthony'
> Cc: Objectbridge (E-Mail); Tom (E-Mail)
> Subject: AW: [Objectbridge-developers] Object References
>=20
>=20
> Hi Anthony,
>=20
> > -----Urspr=FCngliche Nachricht-----
> > Von: Charles Anthony [mailto:cha...@hp...]
> > Gesendet: Montag, 24. September 2001 12:11
> > An: 'obj...@li...'
> > Betreff: [Objectbridge-developers] Object References
> >=20
> >=20
> > Hi,
> >=20
> > I have an Agreement object and an AgreementType object.
> > Agreement has a reference to Agreement type.
> >=20
> > In the database, the field agreementType_id (mapped to=20
> > agreementTypeId)
> > cannot be null i.e. an agreement must have an agreement type.
> >=20
> > public class Agreement {
> >=20
> >     private BigDecimal id;
> >     private BigDecimal agreementTypeId;
> >     private AgreementType agreementType;
> >=20
> > I have accessor methods (get+set) for id and agreementType,=20
> > but not for
> > agreementTypeId - I don't really want the developer to have=20
> > to set this
> > exlicitly, unless absolutely necessary.
> >=20
> > I instantiated a new Agreement, set the id and the=20
> > agreementType fields to
> > be valid objects, I expected OJB to be smart and populate the
> > agreementTypeId for me from the agreementType reference. It=20
> > didn't, hence I
> > got a SQL error=20
> >=20
>=20
> OJB is clever, but not that clever yet ;-)
>=20
> > "Cannot insert the value NULL into column 'AgreementType_ID', table
> > 'AccountingProto.dbo.Agreement'; column does not allow nulls.=20
> > INSERT fails."
> >=20
> > Can/does OJB do this for me, or do I have to set the=20
> > agreementTypeId myself
> > ?
> >=20
> As of today OJB does NOT handle this automatically: you have to fill
> foreignkey attributes in your client app. Of course you can=20
> hide this from
> the application developer. But I agree that it would be a=20
> good feature to
> have OJB handle this stuff automatically.
>=20
> I will place this as a new feature request on my todo list!
>=20
> --Thomas
>=20
>=20
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