RE: Subfile Processing

Why keep the comparison data in an array?  Why not just keep it in the
subfile as a hidden field?

I just create a data structure, usually like the data's record, and then
save the original data as a hidden field in the subfile.  That way I always
have the before and after picture for compares, and to refresh if the user
wishes.

A third advantage has to do with record locking.  When your user finally
decides to press the enter key and process the new data, a quick chain to
the data file and then a quick compare of the data currently in the record
with the values in the hidden data structure will tell you if the record was
changed at another workstation. 

 
 
---------------------------------
Booth Martin
http://www.martinvt.com
---------------------------------
-------Original Message-------
 
From: RPG programming on the AS400 / iSeries
Date: 08/09/05 16:05:30
To: RPG programming on the AS400 / iSeries
Subject: RE: Subfile Processing
 
You'd be surprised how fast looping through all the records in a subfile
is.  If each record is shadowed in an array, the comparisons go very
fast. For interactive response time it's perfectly acceptable.   This is
a function of improved hardware.  A lot of the display file keywords
were developed to minimize the amount of data that passed back and forth
between the terminal and the host during the days of 9.6 cables and
machines with less memory than a contemporary desktop.  There's no doubt
that things like READC are faster, but for idiots like me the loop is a
lot clearer.
 
 
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx
> [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Marvin Radding
> Sent: Tuesday, August 09, 2005 1:13 PM
> To: RPG programming on the AS400 / iSeries
> Subject: RE: Subfile Processing
>
> First, don't loop through the whole file.  If the users are
> modifying the records, then READC will be the fastest way to
> get the modified record.  And don't forget that if there is
> an error, use the return record on next read flag.  Saves a
> lot of headaches.
>
> Marvin
>
>
 
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