Re: SQL vs Native

Note that the upsert merge can (and should if possible) be done with
multiple rows at once...

MERGE INTO mytable AS mt USING (
SELECT * FROM TABLE (
VALUES
(123, 'text')
,(456, 'Hello')
,(789, 'World!')
)
) AS vt(id, val) ON (mt.id = vt.id)
WHEN MATCHED THEN
UPDATE SET val = vt.val
WHEN NOT MATCHED THEN
INSERT (id, val) VALUES (vt.id, vt.val)
;

Charles

On Fri, Aug 19, 2022 at 7:12 AM Greg Wilburn <
gwilburn@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

Brian/Charles and others... thanks for he suggestions. I was not aware of
the MERGE option.
...and as for Google searches - that's usually my "go to". While the
results very useful they don't always return the "best" way of dong things.

Turns out I was able to tailor the application so that I could deleted
groups of records/rows based on a common key.
I still need to create rows one-at-a-time. But SQL is definitely solved
the problem.


-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Greg
Wilburn
Sent: Thursday, August 18, 2022 9:05 AM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: SQL vs Native

I'm developing logic to create a "transactional" file/table in an
existing RPG program that creates labels.
I'm trying to capture information about the labels we produce using a
service program procedure and SQL.

The catch is that the users will, on occasion, recreate/reprint a set of
labels. So I need to ensure I'm not creating duplicate transactions.

With native access, I would simply CHAIN then UPDATE or WRITE based on
%FOUND.
With SQL, I would have to do a DELETE then INSERT for each record.
Just wondering if there's an alternative to the SQL method?

I'm trying to go 100% SQL for file access.

Thanks,
Greg
[Logo]<https://www.totalbizfulfillment.com/> Greg Wilburn
Director of IT
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