Re: json_table(httpgetclob, nested array -- WEB400

Message is pretty clear Booth.

Your result set includes null values for one or more columns and you have not provided a null indicator field to load the null flag into.

On Nov 18, 2019, at 3:54 AM, Tim Fathers <X700-IX2J@xxxxxxxxxxx> wrote:

Hi Booth,

This is the syntax you need:

select *

from json_table(
'{"wData_length":14,"SeasOceans":["Adriatic Sea","Arctic Ocean","Atlantic Ocean","Bay of Bengal","Caribbean Sea"]}',
'lax $'
columns(
DATA_LEN varchar(20) path '$.wData_length',
nested path '$.SeasOceans[*]'
columns(
SEA varchar(20) path '$'
)
)
) as U

...which gives...

DATA_LEN SEA
-------- --------------
14 Adriatic Sea
14 Arctic Ocean
14 Atlantic Ocean
14 Bay of Bengal
14 Caribbean Sea

As others have said, if you want to process the data row-by-row, you'll need to read it with a cursor but they are usually best avoided if you can, so if you need this data in a file just wrap the whole thing in an insert. Assuming the "wData_length" represents the length of the array then I think it's superfluous anyway, as you will only get back one row per array element so you don't need to care how many elements it's says there are..

Tim.

________________________________
From: WEB400 <web400-bounces@xxxxxxxxxxxxxxxxxx> on behalf of Booth Martin <booth@xxxxxxxxxxxx>
Sent: 18 November 2019 01:32
To: Web Enabling the IBM i (AS/400 and iSeries) <web400@xxxxxxxxxxxxxxxxxx>
Subject: Re: [WEB400] json_table(httpgetclob, nested array

exec sql select * into :wCount, :wSeas
from json_table(systools.httpgetclob(:wURL, ''), '$'
columns(
"wData_length" dec(3,0),
SeasOceans varchar(20) PATH 'lax $.SeasOceans[4]' ));

also works, in that it gives me the count and element[4].

For collecting an array, "nested" seems to be the correct word, probably
also needing ''lax $'. I suspect the issue involves either the SQLRPGLE
usage, or more likely, programmer error. I did try to loop. That gave
me element 1 repeatedly; I could not find a way to use a variable in
place of the $.SeasOcceans[4] and using an * instead of the 4 failed.

..On 11/17/2019 6:02 PM, Jon Paris wrote:

It is going to return a row for each element Booth so you'll probably need to use a cursor.

Does it work without nested?

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