Currently JSON_TABLE cannot handle arrays directly, i.e. arrays need to be embedded in an object.
If you receive an array and want to parse it with JSON_TABLE, you just put an array around:
The following SELECT Statement works correctly:
SELECT "code", "value"
FROM JSON_TABLE('{"root": ' concat '[{"code" :"00001","value" :50},
{"code" :"00002","value" :30},
{"code" :"00003","value" :40}]'
concat '}',
'$.root[*]'
COLUMNS ("code" CHAR(10),
"value" DEC(9, 3)))
BTW AFAIK there is an RFE that arrays could be accessed directly.
If you need it, please vote for it
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
"Shoot for the moon, even if you miss, you'll land among the stars." (Les Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them and keeping them!"
„Train people well enough so they can leave, treat them well enough so they don't want to.“ (Richard Branson)
-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jean-Marc DUVAL
Sent: Samstag, 9. November 2019 00:36
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON : ARRAY name needed ?
But, if you have only the array, like this :
[{"code":"00001","value":50},{"code":"00002","value":30},{"code":"00003","value":40}]
This JSON is valid.
What is the good query to get "code" and "value" in my cursor ?
This do not work :
SELECT "code", "value"
FROM JSON_TABLE('[{"code" :"00001","value" :50},
{"code" :"00002","value" :30},
{"code" :"00003","value" :40}]', 'lax $.[*]'
COLUMNS ("code" CHAR(10),
"value" DEC(9, 3)))
I think that 'lax $.[*]' is the problem, but don't know what to use...
Cordialement,
Jean-Marc DUVAL
Pôle développement IT
Développeur IBM i consultant
+33 (0) 6 48 30 21 09
+33 (0) 2 34 59 52 91
-----Message d'origine-----
De : RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> De la part de John Yeung Envoyé : vendredi 8 novembre 2019 23:01 À : RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx> Objet : Re: JSON : ARRAY name needed ?
On Fri, Nov 8, 2019 at 2:31 PM Jean-Marc DUVAL <jean-marc.duval@xxxxxxxxxxx> wrote:
and not this :
SELECT "code", "value"
FROM JSON_TABLE('{[{"code" :"00001","value" :50},
{"code" :"00002","value" :30},
{"code" :"00003","value" :40}]}', 'lax
$.[*]'
COLUMNS ("code" CHAR(10),
"value" DEC(9, 3)))
Is the array name needed ?
Yes.
You should familiarize yourself with the JSON format:
https://www.json.org/
It's quite simple and regular. Curly braces, if not empty, can only contain name:value pairs.
It is easier to understand if you know the concept of associative array, or hash, or dictionary from other languages.
John Y.
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