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  3. January 2020

RE: JSON_OBJECT and Writing to IFS

I am drawing a blank what the issue could be. The second SQL shows the working on that selects the data from the various tables. The first SQL I would like it to produce 1 'row' with 100 iterations within an array (named "data"). The 2nd SQL returns good data but the 1st SQL to produce the JSON returns no error, no result, and not even a warning in the job log. Any thoughts? I think I may have been staring at it for too long.

Free hand of what I'm going for with 2 iterations...
{"data":[{"LocationId" : "0010","ItemId" : "123456789", "SellingPrice" : 99.99}], [{"LocationId" : "0020","ItemId" : "123456789", "SellingPrice" : 99.99}]}

Returns nothing in ACS. No error. No warning in job log. (#1)...
Select json_object('data' value json_arrayagg(
(json_object(
'LocationId' value Digits(Dec(s.STORE_NO4,0)),
'ItemId' value Digits(Dec(a.UPC,12,0)),
'SellingPrice' value a.PRICE))))
From PRICING a
Inner Join STORE_MASTER s On a.PRICING_ZONE = s.PRICING_ZONE
Limit 100 Offset 100;

Working SQL over data (#2)...
Select Digits(Dec(s.STORE_NO,4,0)),
Digits(Dec(a.UPC,12,0)),
a.PRICE
From PRICING a
Inner Join STORE_MASTER s On a.PRICING_ZONE = s.PRICING_ZONE
Limit 100 Offset 100;




-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Birgitta Hauser
Sent: Thursday, January 16, 2020 11:20 PM
To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

You don't need to write it into the IFS from ACS (and if you want you still can write the result of an SELECT statement into the IFS)

What I do is to run the SELECT statement that generates the JSON data.
Then I copy the JSON data into a JSON validator, just to make sure the data is correct.
If everything is okay, I copy the SELECT-Statement into my program and add the INTO FileReferenceFile.

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 20:12
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

If I want to make sure this works in ACS SQL first, how do I save to IFS there? Since can't use host variables there..

Into Clob_file('/temp/sample.json') ?

-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Stephen Piland
Sent: Thursday, January 16, 2020 12:34 PM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

Awesome. Thanks. I'll give it a try.

-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Birgitta Hauser
Sent: Thursday, January 16, 2020 11:48 AM
To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: JSON_OBJECT and Writing to IFS

Instead of Fetch first 10 Rows Only, you use LIMIT and OFSET in composition with a host variable.
But then you need to create multiple IFS files, with different names etc.

HostVar += 10;

with cte as (select * from dbtable Limit 10 Offset :HostVar)
select json_object('data' value json_arrayagg(json_object('id' value id, 'account' value cust_acct)))
into :OutFile
from SysIBM.SysDummy1;



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 Charles Wilt
Sent: Donnerstag, 16. Januar 2020 18:09
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: JSON_OBJECT and Writing to IFS

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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