cursor still isn't needed...

with cte as (select * from dbtable fetch first 10 rows only)
select json_object('data' value json_arrayagg(json_object('id' value id,
'account' value cust_acct)))
from cte;

Charles



On Thu, Jan 16, 2020 at 10:04 AM Stephen Piland <
Stephen@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Understood. However, the outside vendor that we would be creating this
for is requesting we limit the size of the each file created to 100 rows
worth of data for example.

Maybe it isn't possible and I have to go a more 'manual' route.

-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Birgitta Hauser
Sent: Thursday, January 16, 2020 10:59 AM
To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

You do not need to define a cursor, because you'll build the complete JSON
document within a SQL Statement (which might be a little more complex).
So you will only get a single row! No need to limit the number of rows.

A SELECT ... INTO or VALUES ... INTO will do the job:

DCL-S Outfile SQLType(CLOB_File) CCSID(1208);

Clear OutFile;
Outfile_Name = '/temp/accounts_{timestamp}.json'
Outfile_NL = %len(%trimr(Outfile_Name))
Outfile_FO = SQFCRT;

Exec SQL Values(SELECTStatementThatCreatesTheJSONData) into :OutFile; If
SQLCODE < *Zeros;
//Handle Error;
Else;
//Success
End;

Just a tip. Build your SELECT Statement first within ACS - Run SQL Scripts.
If the JSON document is built correctly, copy the SELECT statement into
your program.


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: Donnerstag, 16. Januar 2020 16:46
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

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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