Re: Using a trigger to restrict access to costing bill

["R. Bruce Hoffman, Jr." <rbruceh@xxxxxxxxxxxxx>]

-----Original Message-----
From: Bazinet, Bill <bazinew@leanintree.com>
To: 'rpg400-l@midrange.com' <rpg400-l@midrange.com>
Date: Friday, March 30, 2001 1:15 PM
Subject: RE: Using a trigger to restrict access to costing bill


>
>
>The difficulty with this approach is that the trigger must be a *BEFORE
>or*AFTER timing.  If it's before you can definitely determine that the
>insert/update/delete shouldn't occur but I don't see how you can prevent
it.
>Remember the trigger gets copies of the output buffer from the program
>causing the trigger to fire.  If you use a *BEFORE trigger, upon return to
>the I/O processor the original action will occur.  If you use an *AFTER
>trigger, the operative work is "AFTER".
>Using an *AFTER trigger, you could go back and reset the orignal state of
>the record because the trigger does contain the before picture of the
>record.


The way to prevent the update is to use the before trigger with allow
repeated change *YES and in the program, replace the new record buffer
contents with the old record buffer contents, thus nullifying the update.


===========================================================
R. Bruce Hoffman, Jr.
 -- IBM Certified Specialist - AS/400 Administrator
 -- IBM Certified Specialist - RPG IV Developer

"America is the land that fought for freedom and then
  began passing laws to get rid of it."

     - Alfred E. Neuman



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