Re: Opening a cursor with a variable number of parameter markers...

@Vernon, thanks for the suggestion. I will look into this.
@Birgitta, I was trying to avoid preparing the statement multiple times.
Once the statement is prepared the only thing that changes is the time
period.
So I run it once for a current timestamp range and then run it a second
time for a timestamp range in the past. Nothing else changes in the
prepared statement.
With the understanding that the prepared statement does not change once
created do you still recommend creating it each time?
@Sue, I wasn't aware of this. I will investigate this...

Happy New Years everyone.

Rob

On Thu, Dec 31, 2020 at 8:36 AM Sue Romano <slromano@xxxxxxxxxx> wrote:

We released an enhancement last May for 7.3 and 7.4 that allows you to use
a single OPEN statement for a situation like you describe. Using something
called extended indicators, you can mark host variables in the OPEN to be
ignored. It requires adding the SUBSET keyword to your OPEN and adding
indicator variables for the host variables that you want to control. See
this wiki page for details: https://www.ibm.com/support/pages/node/6174207

Sue Romano
Db2 for IBM i Development

Happy New Year to all.

I need to open a cursor but the number of parameter markers is not known
until run time.
I'm doing this right now with a SELECT statement in RPG but wondering if
this can be softcoded in some way. What I have is...

// We now need to open the statsCursor with the correct number of

parameter

markers
Select;
When fileCount = 1;
Exec sql
OPEN statsCursor USING :fromTs, :toTs;
When fileCount = 2;
Exec sql
OPEN statsCursor USING :fromTs, :toTs, :fromTs, :toTs;
When fileCount = 3;
Exec sql
OPEN statsCursor USING :fromTs, :toTs, :fromTs, :toTs, :fromTs,
:toTs;
Endsl;

Currently this is coded for 3 files, but this can easily be 10 or more
files at run time.

Do I have any other options for OPENing the cursor?

Thanks,

Rob

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