Re: Parsing JSON data into a data structure without knowing variable's names

[Henrik Rützou <hr@xxxxxxxxxxxx>]

It is generally a very bad idea to map JSON to a datastructure (or
anything) without using
the variable name's since the whole idea in JSON is that you may include or
exclude
variables and beside that present them in a random sequence.

On Sat, Aug 12, 2017 at 9:12 AM, Maria Lucia Stoppa <mlstoppa@xxxxxxxxx>
wrote:

> Hello,
>
> I am new to this forum, but I have done some research related to JSON and
> couldn't find anything similar to my issue.
>
> I am working on a proof of concept to code new programs in order to parse
> the only received parameter formed as a JSON object into a data structure.
>
> I explain it better: previously, all our programs received a single
> parameter defined as an external data structure, so as soon as *entry plist
> operation code is executed the data structure and all the fields in it were
> filled in and made available for programs to use them (quite common
> solution). External data structure are defined as PF without member and can
> be used by any program that need to call the one which received it as a
> parameter to perform a specific function.
>
> Now we are moving our ERP's graphic interface to web: it means that a
> program call can be executed by a store procedure called either by web
> applications or by RPG programs. To serve the purpose of having a quick UI
> response, parameters are passed coded in a JSON object and new programs
> have been coded to parse JSON input parameter field by field using SK's
> JSON APIs (thanks!).
>
> I am guessing whether I can expand and generalize this behavior by coding a
> general routine which takes an external definition of JSON (even nested)
> structure and assigns each object's name found into JSON parameter to its
> corresponding variable name's value.
>
> My nightmares are: firstly, today's external DS are one level only and I
> can't figure out how to represent nested levels; secondly how to
> dynamically associate the value of JSON pair to its corresponding
> variable's value according to its type.
>
> One general idea might be to code some external D specifications to be used
> through /COPY option, which represent JSON structure in terms of qualified
> names and types, array included. Then JSON objects can be read element by
> element but how can I address the right DS variable without explicitly
> write its name?
>
> Can you suggest me some technique I haven't explored yet or any other way
> to approach the problem?
>
> Thank you
>
>
> --
>
> Maria Lucia Stoppa
> mlstoppa@xxxxxxxxx
> --
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