AW: [Objectbridge-developers] Object References

[Mahler T. <tho...@it...>]

Hi Anthony,

> -----Urspr=FCngliche Nachricht-----
> Von: Charles Anthony [mailto:cha...@hp...]
> Gesendet: Montag, 24. September 2001 12:11
> An: 'obj...@li...'
> Betreff: [Objectbridge-developers] Object References
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> Hi,
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> I have an Agreement object and an AgreementType object.
> Agreement has a reference to Agreement type.
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> In the database, the field agreementType_id (mapped to=20
> agreementTypeId)
> cannot be null i.e. an agreement must have an agreement type.
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> public class Agreement {
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>     private BigDecimal id;
>     private BigDecimal agreementTypeId;
>     private AgreementType agreementType;
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> 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.
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> 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
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OJB is clever, but not that clever yet ;-)

> "Cannot insert the value NULL into column 'AgreementType_ID', table
> 'AccountingProto.dbo.Agreement'; column does not allow nulls.=20
> INSERT fails."
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> Can/does OJB do this for me, or do I have to set the=20
> agreementTypeId myself
> ?
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As of today OJB does NOT handle this automatically: you have to fill
foreignkey attributes in your client app. Of course you can hide this =
from
the application developer. But I agree that it would be a good feature =
to
have OJB handle this stuff automatically.

I will place this as a new feature request on my todo list!

--Thomas


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