Re: Trigger programme without a trigger.

trigger programs are not always for RI..i use them for audit trails as
well...for the most part i never use triggers for RI but use alternative
methods instead.

Thanks,
Tommy Holden



From:
Simon Coulter <shc@xxxxxxxxxxxxxxxxx>
To:
RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>
Date:
06/11/2008 02:57 AM
Subject:
Re: Trigger programme without a trigger.




On 10/06/2008, at 7:34 AM, Lim Hock-Chai wrote:

Yes, trigger should run under the same commitment definition as the
caller program. That is a given. The problem is what if you need the
trigger to do a task that cannot run under commitment control? For
example, send an email under certain condition, submit a job under
certain condition...

That would be an incorrect use of a trigger program. Triggers are to
extend referential integrity--using them for anything else is a
flawed design. I know many of the IBM examples show triggers being
used to e-mail, fax, and a bunch of other stuff that has no business
being performed by a trigger but just 'cause it's from IBM don't make
it right.

Even in the rare case of no access to the source code so using a
trigger "solves the problem" it is still bad design. There are
alternatives that should be used instead.

Regards,
Simon Coulter.
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