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Darren,

Thanks, but the issue with Qualified is the way the program was written it takes advantage of the fact that all of the fields from all of the files having the same name get populated when one is populated, for example when the program populates the SYAN8 with a value it is good in about a half dozen files, if I use qualified I would have to create statement for each file. The fields are not populated in one nice neat location they are spread out through several subroutines which increases the difficulty. So at the time to write the file the fields named in the DDS are populated, but they are not in any DS so I cannot do a eval-corr.

-Danny

-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Darren Strong
Sent: Friday, January 20, 2017 10:16 AM
To: RPG programming on the IBM i (AS/400 and iSeries) <rpg400-l@xxxxxxxxxxxx>
Subject: RE: Externally Defined Data Structure Qualified

When you do the read/write/update operations, these can be directed to use a qualified DS, instead of using the default fields defined with an external file definition. You might want to even define the file as qualified, so that the compiler will flag any fields in the program as invalid if they're not using the data structure you're defining. All I/O would then occur against the DS you've defined, giving you better control, and the ability to do the EVAL-CORR operation.






From:Danny Hayes <Danny_Hayes@xxxxxxxxx>
To:"RPG programming on the IBM i (AS/400 and iSeries)"
<rpg400-l@xxxxxxxxxxxx>
Date:01/20/2017 10:06 AM
Subject:RE: Externally Defined Data Structure Qualified
Sent by:"RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>



Mark,

Thanks for your reply, however the issue is I cannot create a 'base' DS due to having field the same in other files, so I can have the renamed fields DS but nowhere to eval-corr to. Do you follow my dilemma? If I cannot get the fields back into the record format to write the record then I have not accomplished the goal. I do not think I can do an eval-corr into a record format, can I?

-Danny

-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of mlazarus
Sent: Friday, January 20, 2017 9:10 AM
To: RPG programming on the IBM i (AS/400 and iSeries) <rpg400-l@xxxxxxxxxxxx>
Subject: Re: Externally Defined Data Structure Qualified

Danny,

Check out the EVAL-CORR opcode. It moves fields with the same name from one DS to another. For the purpose of the operation of this opcode, the subfield qualification (due to the "qualified" keyword) is ignored. I assume that EVAL-CORR would not recognize "prefix"ed variables and know to restore the variable back to its original name.

-mark

On 1/20/2017 8:07 AM, Danny Hayes wrote:
I have a program, actually 6 of them (around 5,000 lines each), that
each
have multiple files that have field names in common across all of the files.

The programs write a header record for incoming EDI and then write
detail
records for that header record.

The issue was that at the time the header record was processed and
then
moved on to process the details another program began processing the details before all had been written.

The decision was made to delay the writing of the header until all
detail records had been processed. To do this I created a flag to say
header is ready and instead of writing moved the

externally defined DS to a second one with a prefix on it so that no
values would be changed prior to when I actually do write the record, after all details were processed.

Well, due to the commonly named fields the second external DS would
not
rename its fields because they were already defined in the first DS.

To handle this I added QUALIFIED onto each of the External DS's, this
allowed everything to compile, almost.

Now the issue is the original design of the program counted on
population of all fields at one time. SO even if I qualify everywhere
one of the 'commonly named fields' is used I then loose the populating
of

every other iteration of that field name.

My objective is to not have to write subroutines/subprocedures to
manually move these hundred plus fields into a save area and then back out of the same.

I know that someone out here has had to figure this out before,
although
maybe not, I have never seen anything like this before, that I can recall, but then some days I don't remember what I had for lunch yesterday.

Thanks& Regards,
Danny

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