RE: Chain vs SetLL/ReadE

Thanks to ALL! This subject is MUCH clearer to me now!

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Tommy.Holden@xxxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, September 02, 2008 8:51 AM
To: RPG programming on the AS400 / iSeries
Subject: Re: Chain vs SetLL/ReadE

what timing! there's been an ongoing discussion about this on systeminetwork forums
http://forums.systeminetwork.com/isnetforums/showthread.php?t=52004
Barbara Morris gave some good insight on this thread.

Thanks,
Tommy Holden



From:
Chandra Krieg <chandrak@xxxxxxxxxxxxxx>
To:
"'rpg400-l@xxxxxxxxxxxx'" <rpg400-l@xxxxxxxxxxxx>
Date:
09/02/2008 08:37 AM
Subject:
Chain vs SetLL/ReadE



Hello all,

I have been told that the preferred method of random record retrieval is to use the SetLL, then do a ReadE and check for the %EOF indicator.

Why is this preferred over using a Chain with %found or even checking for %Equal on the SetLL before reading the file? I have been told that the Chain doesn't do what I'm expecting it to but I've never had issues in the past.

I have read the archive posts and found opinions on the subject but no concrete explenation as to why. As with some of the posts I don't understand why you would want to readE the file if the SetLL didn't find an %equal match or why if you plan to read the file a chain isn't appropriate.

I'm being told to use the following code instead of a Chain.

SetLL (KeyFields) FIleName;
ReadE (KeyFields FIleName;
DoW Not %EOF(FIleName);
do my stuff
ReadE (KeyFields) FileName; EndDo;

Any explanations would be helpful!

TIA!

Chandra Krieg
i5 Programmer/Analyst
RateWatch
(P) 1.800.348.1831 ext 311
(F) 1.920.568.1403
www.rate-watch.com
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