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Hello Maria,
Am 28.07.2020 um 09:16 schrieb Maria Lucia Stoppa <mlstoppa@xxxxxxxxx>:
Everything works fine, except the same static SQL statement is run at least twice to know the total number of rows (a simple count(*)) and the rows themselves page by page.
Since DB/2 utilizes a fair amount of caching, I don't see a big deal. But I get your idea.
Since your regular SELECT returns many rows, and a SELECT COUNT() precisely one, you can't use them in one statement. I have a dim memory about a variable in some SQL-internal data structure containing the number of rows returned by the last query, though. Maybe you want to consult the manual about embedding SQL in HLL to learn more about it.
There might be errors in my design of how the procedure should work
If you have a very frequent amount of requests triggering these SQLs over and over again while the results are the same, maybe you could pre-calculate results into scratch tables in a batch job and use them? Call it "cache".
Any suggestion is really appreciated.
This isn't about RPG, but about SQL, so it's a bit off topic in here. ;-)
:wq! PoC
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