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Newsgroups: comp.lang.ada
Date: Fri, 8 Jun 2018 05:00:27 -0700 (PDT)
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Subject: Re: GNATCOLL JSON Parsing
From: Per Sandberg <persan.sandberg@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:52989
Date: 2018-06-08T05:00:27-07:00
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On Friday, June 8, 2018 at 7:52:56 AM UTC+2, eduards...@gmail.com wrote:
> I try understand parsing JSON in Ada. 
> 
> For example:
> Have web-api that gives simple JSON: http://api.exmo.com/v1/trades/?pair=BTC_USD&limit=10
> 
> I need to save this data to database.
> Created type:
> 
>    type Money is delta 0.00000001 range 0.0 .. 9_999_999_999.9;
>    type UTC_Date is range 1_500_000_000 .. 3_000_000_000;
> 
>    type Trade is record
> 
>       Trade_Id   : Integer;
>       Pair       : Unbounded_String;
>       Trade_Type : Unbounded_String;
>       Price      : Money;
>       Quantity   : Money;
>       Amount     : Money;
>       Date       : UTC_Date;
>       Saved      : Boolean;
> 
>    end record;
> 
> Created collection:
> 
>     package Vector_Trades is new Ada.Containers.Vectors(Natural, Trade);
> 
>     Trades : Vector_Trades.Vector;
> 
> Receive data:
> 
> JSON : Unbounded_String;
> 
> JSON := To_Unbounded_String(AWS.Response.Message_Body (AWS.Client.Get (URL => "http://api.exmo.com/v1/trades/?pair=BTC_USD&limit=10")));
> 
> What to do next? How to get list of objects from the JSON-text?
> 
> How to save data to database already understood.
> 
> Thanks.

You might find the library
 https://github.com/persan/gnatcoll-json
Usefull it contains JSON suport for most Ada.Containers.* packages and som examples.
/P