Hello, Norman,

You're right about keeping the rules and regulations of data integrity in the database rather than the application. Good working practice.

Maybe Firebird is different from Oracle in that I have successfully created my ID column as a primary key without the non-null constraint. So, it's possible even if not perhaps advisable.

Maybe the right solution is to modify the Required setting of the FieldDefs in the application and leave the non-null constraint on the database?

Thank you for your reply.

Regards,

Mike Watson
Datos Informatica.

--- In firebird-support@yahoogroups.com, "Dunbar, Norman" <norman.dunbar@...> wrote:
>
> Hi Mike,
>
> >> I think it will be easier to modify the DDL of the database
> >> generation so that the relevant non-null fields which have a
> >> Before Insert trigger become generated without the non-null
> >> constraint.
>
> are you intending to use these ID columns as a primary key? If so, I
> suspect you won't be able to if they are not defined as NOT NULL in the
> database. Just a thought.
>
> Additionally, all constraints and business rules *should* be defined in
> the database because that way, any application that tries to change the
> data is subject to all the rules and regulation. By putting some
> "constraints" and rules into the application, you are creating a void
> through which data integrity corruptions can sneak!
>
>
> Cheers,
> Norman.
>
> Norman Dunbar
> Contract Senior Oracle DBA
> CIS Engineering Services
> Internal : 7 28 2051
> External : 0113 231 2051
>
>
>
> Information in this message may be confidential and may be legally privileged. If you have received this message by mistake, please notify the sender immediately, delete it and do not copy it to anyone else. We have checked this email and its attachments for viruses. But you should still check any attachment before opening it. We may have to make this message and any reply to it public if asked to under the Freedom of Information Act, Data Protection Act or for litigation. Email messages and attachments sent to or from any Environment Agency address may also be accessed by someone other than the sender or recipient, for business purposes. If we have sent you information and you wish to use it please read our terms and conditions which you can get by calling us on 08708 506 506. Find out more about the Environment Agency at www.environment-agency.gov.uk
>
> Information in this message may be confidential and may be legally privileged. If you have received this message by mistake, please notify the sender immediately, delete it and do not copy it to anyone else.
>
> We have checked this email and its attachments for viruses. But you should still check any attachment before opening it.
> We may have to make this message and any reply to it public if asked to under the Freedom of Information Act, Data Protection Act or for litigation. Email messages and attachments sent to or from any Environment Agency address may also be accessed by someone other than the sender or recipient, for business purposes.
>
> If we have sent you information and you wish to use it please read our terms and conditions which you can get by calling us on 08708 506 506. Find out more about the Environment Agency at www.environment-agency.gov.uk
>