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  2. RPG400-L
  3. May 2016

Re: Conceptual subfile question

Okay,

I originally started with COBOL on a model 360/50 where the sort was
in the program. (now I'm really old). Sorry couldn't resist.

Enough already!

Bill






From: Jon Paris <jon.paris@xxxxxxxxxxxxxx>
To: Rpg400 Rpg400-L <rpg400-l@xxxxxxxxxxxx>
Date: 05/03/2016 04:21 PM
Subject: Re: Conceptual subfile question
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>



That may be so.

I started off with “RPG” (quotes because it was called NICOL but it was
very very similar to RPG - cycle and all) but then did COBOL, Fortran,
Assembler, Basic, etc. for a number of years. I came back to RPG with RPG
III on the S/38 and then the early 400.

Those other languages may have broken my “old stuff” mental model!


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

On May 3, 2016, at 5:07 PM, broehmer@xxxxxxxxxxxxxxx wrote:

Jon,

I grew up through S3 mod 15 days to rpgle and have taught several
programmers through
trial and error how to code rpg subfiles. I myself originally struggled

with the "old" concepts but when
I started telling "kids" what a subfile was it usually took a while. My

latest "newbie" was confused at
first but when I showed him what your example was last year he just ate
it
up. Took to it like duck to water.
I've never had that experience and now he's by far the best programmer
I've had the pleasure to train.
So, my thought is that if you "grew up" with rpg you might not have an
easy time "getting" what
the latest rpgle stuff can do. You almost have to un-train yourself to
appreciate what you have
shown us. Just a thought.

Bill

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From: Jon Paris <jon.paris@xxxxxxxxxxxxxx>
To: Rpg400 Rpg400-L <rpg400-l@xxxxxxxxxxxx>
Date: 05/03/2016 03:37 PM
Subject: Re: Conceptual subfile question
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>



Always good to hear things like that Bill - thanks.


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

On May 3, 2016, at 3:43 PM, broehmer@xxxxxxxxxxxxxxx wrote:

Jon,

The week that article came out our shop tried it, liked it and have
never
looked back. We stopped using hidden everything and just use likerec
and eval-corr for inquiry and maintenance. Love it!

Bill






From: Jon Paris <jon.paris@xxxxxxxxxxxxxx>
To: Rpg400 Rpg400-L <rpg400-l@xxxxxxxxxxxx>
Date: 05/03/2016 02:23 PM
Subject: Re: Conceptual subfile question
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>



Boy you guys like to make it complicated!

Read this for a much simpler approach
http://www.itjungle.com/fhg/fhg030315-story01.html

The example there is for a single record update but the exact same
method
can be used when handling subfiles. The only time I would ever consider

using hidden fields for this purpose in a subfile is if that “subfile”
were a web page and I was using to hold state information.


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

On May 3, 2016, at 3:09 PM, Booth Martin <booth@xxxxxxxxxxxx> wrote:

Your response is a great response and is well said.

I'd add this: I define a data structure made up of the input-capable
fields on the screen and also define a field named OrigFields. When I
write the subfile record I also populate OrigFields, which becomes a
hidden field in the subfile record.
That provides:
- an easy two-field compare,
- allows an easily implemented F5-Refresh,
- an easy way to check if any updated fields were changed at another
work station in the interim between the unlocked read and the locked
chain.

On 5/3/2016 8:04 AM, Mark Murphy/STAR BASE Consulting Inc. wrote:
... To determine if a record is changed, I simply keep hidden copies
of
every input field, and compare the saved value to the input field.
Those

hidden copies are loaded with the subfile record, and do not change
until
I save the subfile record out to the database. ...
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