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

You missed my point Brad - which was that YAJL_OBJECT_LOOP will loop through anything. The rest of it was just showing how the generic object can be compared to find its identity.

But I agree in as much as one always needs to know something in a business processing environment. Unless you are simply writing a utility to report (for example) on what it finds.


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

On Aug 13, 2017, at 12:22 PM, Bradley Stone <bvstone@xxxxxxxxx> wrote:

On Sun, Aug 13, 2017 at 1:53 PM, Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

Not necessary to know the structure Nathan as you can query what kind of node you are dealing with.

A straight object loop can also be used - for example:

Dow YAJL_OBJECT_LOOP( customerNode: i: key: node );
Select;
When key = 'ID';
customer(c).id = YAJL_GET_NUMBER( node );
When key = 'Name';
customer(c).name = YAJL_GET_STRING( node );

In this instance I only need certain fields and the names are known - but the YAJL_OBJECT_LOOP itself dd not require that I know the names or types of the objects.

How is knowing the names, data types and container not knowing the structure?

You know you're in a customer array that contains at least a numeric
ID and character name. I'd say that's at least knowing the structure
at least partially, if not wholly.

As I said earlier I think code gen is the way to go - but the JSON structure can be dynamically determined just as XML-SAX allows you to do with XML.

Yes, that makes sense, but once you do the program "knows" the
structure and is built appropriately around thus said structure.

Bradley V. Stone
www.bvstools.com
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