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Scott, your explanation is brilliant as usual.
But my question remains unanswered. If I use file fields directly as KLIST
variables, I believe using KLIST will make maintenance easier.
And as for F11'ng - we need to see the KLIST quite often because we work on
various projects and many a times debugging programs written by somebody
else.
Another doubt comes to mind - If you define a KLIST as a data structure,
will there be any memory overheads? And secondly if I have many data
structures already defined and used in the program (e.g. programs in CA-PRMS
etc.), don't you think that this new set of data structures will further
lengthen the list and make the life of a maintenance guy difficult? That too
when you are battling against time in most of the cases.
Cheers
Vijosh A
Systems & Software
123 , SDF- 4, SEEPZ
Bombay, India.
Email : <vijosha@alfuttaim.co.ae>
-----Original Message-----
From: Scott Klement [SMTP:infosys@klements.com]
Sent: Wednesday, June 16, 1999 11:03 PM
To: RPG400-L@midrange.com
Subject: Re: RE: What bugs you about KLISTs in RPG IV?
Vijosh A <VijoshA@alfuttaim.co.ae> wrote:
> Your idea is interesting.
>
> But let me draw your attention to a problem that comes to my mind-
I
> suppose you do not have a KLIST and as it often happens there are
> changes
> to key fields (although not frequently). So if I use your method
the
> I will
> have to change the same in many a places. Especially when you are
> using
> physical file fields in the KLIST. This may make maintenance
> difficult. So
> therefore I would still prefer to use KLISTS.
I honestly don't see how it'd be any different making these changes
using KLISTs vs. the free-form syntax.
okay, here is a keylist example:
C KeyList KLIST
C KFLD KeyFld1 5 0
C KFLD KeyFld2 10
C KFLD KeyFld3 15
C KeyList CHAIN File 10
C* 50 lines later:
C KeyList CHAIN File 11
C* 100 Lines later:
C KeyList CHAIN File 12
Here is the same thing, with free-form syntax....
D KeyFld1 S 5 0
D KeyFld2 S 10A
D KeyFld3 S 15A
CF CHAIN(KeyFld1:KeyFld2:KeyFld3) File
C* 50 lines later
CF CHAIN(KeyFld1:KeyFld2:KeyFld3) File
C* 100 lines later
CF CHAIN(KeyFld1:KeyFld2:KeyFld3) File
In both cases you only have to change the keys WHERE THEY ARE
DEFINED.
In BOTH cases, this is only in ONE PLACE.
How is it different for the purposes of maintenance?
Yes, you don't HAVE to specify the same variables on each chain
statement with the freeform expression, but you also don't have to
with the KLIST!
For example:
C KeyList KLIST
C KFLD KeyFld1 5 0
C KFLD KeyFld2 10
C KFLD KeyFld3 15
C KeyList CHAIN File 10
C* 50 lines later:
C KeyList2 KLIST
C KFLD Key2Fld1 5 0
C KFLD Key2Fld2 10
C KFLD Key2Fld3 15
C KeyList2 CHAIN File 11
Would not be any "easier to maintain" than:
D KeyFld1 S 5 0
D KeyFld2 S 10A
D KeyFld3 S 15A
D Key2Fld1 S 5 0
D Key2Fld2 S 10A
D Key2Fld3 S 15A
CF CHAIN(KeyFld1:KeyFld2:KeyFld3) File
C* 50 lines later
CF CHAIN(Key2Fld1:Key2Fld2:Key2Fld3) File
When you're updating all of your programs because the keys have
changed, you currently have to do this:
1) Search your program for all the CHAIN, SETLL, DELETE & READE
op-codes for that file.
2) Find all of the keylists referenced in step 1, and determine what
variables they are using.
3) Find out where those variables are used, and change their defs...
However, with the proposed, new, free-form method you would:
1) Search for all the CHAIN, SETLL, DELETE and READE statements
just like above.
2) Check the definitions for the variables used, and update them,
just like step #3 above.
Since the variables are referenced directly, you no longer have to
do step #2.
So, I'm very sorry, but no matter how I look at it, I can't see how
this makes maintenance MORE DIFFICULT!!!!
>
> Another problem you have not addressed is the - facility to use
F11
> a
> KLIST. This is facility will be useful and will be highly
appreciate
>
> Thanks
>
> Cheers
>
> Vijosh A
> Systems & Software
> 123 , SDF- 4, SEEPZ
> Bombay India.
Theres a very simple solution to the whole "debug a whole keylist"
problem. Just put all of your keys in a data structure somewhere,
and debug THAT.
Maybe I'm weird, but its only once in a blue moon that I need to
debug a keylist, and hitting F11 (or typing eval varname) for 2 or 3
different variables in a keylist doesn't bother me at all. If it
did,
I'd make a data structure that contained all of my keys, just to
make
it easier to debug them.
Scott Klement
Information Systems Manager
Klement's Sausage Co, Inc.
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