RE: JSON_OBJECT and Writing to IFS -- RPG400-L

I was able to build a JSON document with multiple objects (rows from DB) using json_arrayagg within a json_object and that worked fine.

I was wondering if anyone has ever tried to limit the number of rows from DB table per IFS created in a SQL cursor like loop?

Pseudo code..
DCL-S OutFile SQLType(CLOB_FILE) CCSID(1208);

Exec sql Declare c1 cursor for json_object('data' value json_arrayagg(json_object('id' value id, 'account' value cust_acct))) from DB_Table offset 10 rows;
Exec sql open c1;

Dow sqlcod = 0;
Outfile_Name = '/temp/accounts_{timestamp}.json'
Outfile_NL = %len(%trimr(Outfile_Name))
Outfile_FO = SQFCRT;
Exec sql fetch c1 for 10 rows into :Outfile;
Enddo;

Exec sql close c1;

I know this isn't 100% 'correct' but hopefully someone gets a clue what I'm trying to do.

Thanks!

-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Birgitta Hauser
Sent: Wednesday, January 8, 2020 9:53 AM
To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

Select ... INTO can only handle a single return value/row!

In this way you should build the complete JSON document within a single SELECT statement and write the result into the IFS.
For complex queries use common table expressions (CTE).
In the first (few) CTEs generate the raw data that must be included in the JSON document.
In the next CTEs build successive the JSON data, starting with the lowest level and then merging the result of these CTEs in the next CTEs ... until the complete JSON document is built.

... on the other side it is possible to append data to an IFS table.
You have to change the _FO value to SQLAPP (=Append). After having changed the File Operation, new data is added to the end of the IFS file.

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 Stephen Piland
Sent: Mittwoch, 8. Januar 2020 16:06
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

Great! Thanks! That did work. It only allows me to fetch the first row to dump into the IFS file, which makes sense to me.

How could I include multiple JSON messages / 'rows'? Someone approached us about doing ND JSON, which might be what this would be. I'm not sure to be honest.

Any thoughts?

-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Birgitta Hauser
Sent: Tuesday, January 7, 2020 11:23 PM
To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

Outfile must be a CLOB_FILE CCSID 1208.

DCL-S OutFle SQLType(CLOB_FILE) CCSID(1208);

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 Stephen Piland
Sent: Mittwoch, 8. Januar 2020 01:46
To: rpg400-l@xxxxxxxxxxxxxxxxxx
Subject: JSON_OBJECT and Writing to IFS

Anyone have any luck writing the encoded JSON out to the IFS like we have done with XML using sqltype(xml_clob_File) and Select-ing into that variable? Do I need to convert / cast the JSON_OBJECT into a CLOB in the SQL? Thanks!

Quick Test...
dcl-s Outfile sqltype(xml_clob_File) ;
exec sql Set Option COMMIT=*NONE,CLOSQLCSR=*ENDMOD,DATFMT=*ISO;

// Prep JSON File
Outfile_Name = %trim('/temp/test.json'); Outfile_NL = %len(%trimr(Outfile_Name)); Outfile_FO = SQFCRT;

exec sql Select json_object ('upc' value fldupc, 'price' value price) Into :Outfile From PRICING;

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