Its not an RPG thing necessarily. SQL update will do this too. I suspect
its done at the journal level. If you run an update against a file,
something like:
update USRLST set USR=USR
The above statement will generate now journal entries even though SQL will
report that it updated records.
There is a journal setting where you can journal open and close operations,
if you want that kind of data.
From: Charles Wilt <charles.wilt@xxxxxxxxx>
To: "RPG programming on the AS400 / iSeries"
<rpg400-l@xxxxxxxxxxxx>
Date: 03/05/2015 11:06 AM
Subject: Journal not showing update - DB won't update if nothing has
changed?
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>
All,
Been looking into a issue and thought I had a handle on it.
Till I realized for certain records, I don't see an update entry in the
journal as I expected.
Back to the code...after spending a an hour or so looking. I really can't
see how the UPDATE wouldn't have have been hit.
Then it hits me, for a few records, none of the values in the fields of the
file would have actually changed between READ and UPDATE.
IIRC, RPG by design won't actually do an update unless the buffer's
changed.
In other words:
read myfile;
wFld1 = fFld1;
wFld2 = fFld2;
fFld1 = wFld1;
fFld2 = wFld2;
update myfileR;
Wound't actually update the record in myfile.
Can anyone confirm that I'm not misremembering?
Thanks!
Charles
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