https://blog.faq400.com/en/programming/json-ibmi-faq-howto-2/
On Fri, 2020-12-11 at 23:19 +1000, Don Brown via MIDRANGE-L wrote:
Ok I have re-downloaded the YAJL save file and now I have the YAJLDTAGEN
program.
But I still can't find ane examples / doco on how to call using DATA-GEN
Any examples to generate the required data structure from a json string
would be appreciated.
Thanks
Don
From: "Don Brown via MIDRANGE-L" <
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To: "Midrange Systems Technical Discussion"
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Cc: "Don Brown" <
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Date: 11/12/2020 10:56 PM
Subject: Re: DATA-INTO where number of records not known
Sent by: "MIDRANGE-L" <
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I have the latest download of Scotts YAJL library
I am looking for an example of YAJLGEN
For that matter I do not seem to have a program YAJLGEN on the system
where do I get this download ?
Thanks
Don
From: "Charles Wilt" <
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To: "Midrange Systems Technical Discussion"
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Date: 11/12/2020 09:27 AM
Subject: Re: DATA-INTO where number of records not known
Sent by: "MIDRANGE-L" <
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Have you looked at using YAJLGEN to generate the DS & DATA-INTO call you
need?
You can do it yourself or course, but YAJLGEN sure makes for an easy first
pass.
Basically, in the data-into you include "count prefix" like so:
countprefix=num_
then in your DS, you include a field
dcl-ds jsonDoc;
num_SOMEARRAY int(10);
SOMEARRY char(10) dim(9999);
end-ds;
YAJLINTO will load the array and the value in num_SOMEARRAY will be how
many entries were loaded to the array.
Now if your # of entries exceeds the max array size for RPG, then I think
%handler() is your solution.
I've only seen it used once, and that was for XML...but it only processes
part of the doc at a time before passing the data to your handler. A
quick
serach didn't turn up a good exmaple of using it for JSON.
Teraspace and a based pointer might be another option if you're dealing
with really large documents...just a thought.
Charles
On Thu, Dec 10, 2020 at 3:01 PM Don Brown via MIDRANGE-L <
<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>
midrange-l@xxxxxxxxxxxxxxxxxx
wrote:
(Sorry, not sure if this is should be the RPG list only or the Midrange
list)
We are using data-into with YAJLINTO to process a json file we retrieve
from an external site using a web service.
The web service does not provide any options as to controlling the
number
of records to be returned.
The json returned does not have an element for the number of records
provided.
If I put a count at the highest level will this be set correctly if the
number of records retrieved exceeds the array size ? And if yes how do I
then process the records past that point ?
I don't think the %handler option helps - well the way I read the doco
it
wont.
How do I either check how many records have been returned or process a
json string that exceeds the number of elements in my receiving array ?
Thanks for all suggestions
Don
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