RE: Changing triggers

I don't think they did anything special inside the generic trigger processor.  
From what I remember, they simply take the trigger buffer, load it into a 4 or 
5k field, and write it to a database.  

A batch job pulls in the record, and resignals the data to the appropriate 
trigger program(s).  There is at least one secondary trigger program that deals 
with handling the records for each file, and most of them at least reference 
the DDS of the original file so they can properly pull apart the buffer.

Regards,
Rich


-----Original Message-----
From: owner-rpg400-l@midrange.com [mailto:owner-rpg400-l@midrange.com]On
Behalf Of John P Carr
Sent: Monday, March 27, 2000 1:35 PM
To: RPG400-L
Subject: RE: Changing triggers




I would like to see how they accommodated the different buffer
layouts(Before/After image) based on the record length of each file evoking
the trigger.

John Carr
----------------------------------

One of the software vendors I work with has done this.

What they did was to build a generic trigger program, which they reference
on the ADDPFTRG command. The generic trigger when activiated writes it's
data to file.  A batch job waiting on the same file with an end of file
delay then refers to a table to determine which program(s) should be called
to re-signal the trigger.

Of course, the generic trigger program has to be well thought out, and
including extra program calls to re-signal the trigger does have a
performance penalty.  

AFAIK, these triggers are only *AFTER style triggers, just intended to let
another application or interface know that a record had been
added/changed/deleted.  

This setup was written in RPG III
Regards,
Rich
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