Re: SQL Cursor issues

Thank you, Daniel.

After I posted the earlier conundrum, I checked SQLCODE debug while
testing. The first time the program runs, like I said runs okay. I close
the cursor with "EXEC SQL CLOSE M1" after populating the subfile.

When the code comes thru again to open the cursor, the OPEN CURSOR
returns SQLCODE = 100, the end-of-data value. That is a good clue that
the end-of-data flag lingers from the previous open even after closing
the cursor.

So my new question is, how to make sure that flag is reset after closing
the cursor?

--Alan


On 6/11/2022 5:32 PM, Daniel Gross wrote:

Hi Alan,

have you SQLCODE checks after all EXEC SQL statements?

Especially after the EXEC SQL OPEN statement, because if the open fails,

the fetch will also "fail" or return no rows.

Often it is an "cursor not closed" issue - so try to debug all SQL

statements and find out, if you have any SQL errors.

HTH and kind regards,
Daniel

Am 11.06.2022 um 21:13 schrieb Alan Cassidy <cfuture@xxxxxxxxxxx>:

Good day all,

I have a program that declares and opens a cursor. The fetch is

Load-All into a DS array that I use to populate a subfile. When the program
first runs, works fine, I'm getting data displayed in the subfile,
apparently data that should be there.

Here is the sequence of events:

1. Declare and open cursor M1.

2. Fetch all selected records into a DS array. Data is returned to the

array.

3. Close the cursor.

4. Populate the subfile from the DS array. I see data, looks good.

5. Press F5 to refresh the data. (The cursor is based on an SQL View

that should return data that reflects changes to the underlying
tables/files the View is based on.

6. Returns ZERO rows. No data. Diagnostic data says zero too. So the

subfile is what I call empty.

7. F5 again. Repeat steps 1 thru 4 again, this time there is data again.

After that it's a cycle. Press F5, blank screen. F5 again, data. F5

again, blanks. F5 again, data!

I thought of doing a DYNAMIC SENSITIVE SCROLL CURSOR so the cursor

itself could get updated dynamically from data changes, /and/ at the same
time I can FETCH FIRST again and start over.

Except then I need to rerun the Declare and Open when they request to

position to certain other places in the data, plus I want to implement
something like this for another place in the program where the users can
request a different ORDER BY.

Any idea why this is happening, and more important how to "fix it"?

To anybody who replies, THANK YOU!

--Alan
--
This is the RPG programming on IBM i (RPG400-L) mailing list
To post a message email: RPG400-L@xxxxxxxxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: https://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxxxxxxxx
Before posting, please take a moment to review the archives
at https://archive.midrange.com/rpg400-l.

Please contact support@xxxxxxxxxxxxxxxxxxxx for any subscription

related questions.

Help support midrange.com by shopping at amazon.com with our affiliate

link: https://amazon.midrange.com
--
This is the RPG programming on IBM i (RPG400-L) mailing list
To post a message email: RPG400-L@xxxxxxxxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: https://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxxxxxxxx
Before posting, please take a moment to review the archives
at https://archive.midrange.com/rpg400-l.

Please contact support@xxxxxxxxxxxxxxxxxxxx for any subscription related
questions.

Help support midrange.com by shopping at amazon.com with our affiliate
link: https://amazon.midrange.com