Re: Comparing old/new fields in trigger program

I don't see it on ADDPFTRG but I think with SQL triggers you can tell it 
to fire off only if certain fields get changed.  Saw this in the October 
2001 edition of iSeries News in an article by Kent Milligan "Uncovering 
V5R1 Triggers".

Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin 





Dave Murvin <davem@xxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
09/04/2003 08:55 AM
Please respond to RPG programming on the AS400 / iSeries
 
        To:     rpg400-l@xxxxxxxxxxxx
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        Subject:        Comparing old/new fields in trigger program


We will be creating several more trigger programs for some additional data 

files.  Some of these files have hundreds of fields, but we are only 
interested in changes to a small subset of these fields.  Is there a way 
to 
easily group the fields we are interested in into another data structure 
(besides the new/old record image) so we can determine if there was a 
change we are interested in by comparing two data structures versus 
checking every field we are interested in?  Ideally the field values would 

be sucked into the data structures without having to code the moves.  The 
fields we are interested in are spread throughout the filed and are not 
usually contiguous.

I have tried additional data structures, but program will not compile 
because the fields are already defined in the old/new data structures.  We 

are on V5R1.

Snippet from existing trigger program follows:

  * Record detail for old record
D OldRecordDS   E DS                  ExtName(ECL)
D                                     Prefix(Old)
D                                     Based(OldRecordPtr)

  * Record detail for new record
D NewRecordDS   E DS                  ExtName(ECL)
D                                     Prefix(New)
D                                     Based(NewRecordPtr)

C                   Eval      OldRecordPtr = %Addr(TrigBuf) + OldRcdOff
C                   Eval      NewRecordPtr = %Addr(TrigBuf) + NewRcdOff

Thanks for any suggestions.

Dave Murvin
DRM Enterprises, Inc.


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