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James Lampert wrote:
The easiest way to veto a change from a "before" trigger is what?
Cause the trigger program to fail with a fatal error?
I know I have an example of a trigger program that vetoes everything
unconditionally (I wrote one to exercise QuestView's trigger veto
detection feature some years ago), but I can't remember what it did,
or where I put it.
Optionally send a diagnostic message, for example to the requester of
the I/O, and then... Send an Escape message to the program previous to
the trigger program; i.e. to the DB I/O program. When that DB I/O
program receives the escape message, that will effect termination of the
trigger and manifest that as an I/O error to the program that requested
the I/O. Due to implementation details, that escape message will become
irretrievable; it will not be visible, neither in a trace nor joblog,
and why the diag message may be valuable if the I/O requester needs some
information about why the I/O was prevented\vetoed.
Regards, Chuck
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