Re: SQL Stored procedure returning cursor to client - how to tell how many rows?

Luis,

Either I'm doing something wrong or I'm misunderstanding ROW_COUNT..

I've got this:

Open replCursor using subscriber;
Get Diagnostics recordCount = ROW_COUNT;

My recordCount is 0, even though rows are returned...

The v5r4 manual says:
ROW_COUNT Identifies the number of rows associated with the previous
SQL statement that was executed. If the previous SQL statement is a
DELETE, INSERT, REFRESH, or UPDATE statement, ROW_COUNT identifies the
number of rows deleted, inserted, or updated by that statement,
excluding rows affected by either triggers or referential integrity
constraints. If the previous statement is a PREPARE statement,
ROW_COUNT identifies the estimated number of result rows in the
prepared statement. If the previous SQL statement is a
multiple-row-fetch, ROW_COUNT identifies the number of rows fetched.
Otherwise, the value zero is returned.

DB2_NUMBER_ROWS If the previous SQL statement was an OPEN or a FETCH
which caused the size of the result table to be known, returns the
number of rows in the result table. For SENSITIVE cursors, this value
can be thought of as an approximation since rows inserted and deleted
will affect the next retrieval of this value. If the previous
statement was a PREPARE statement, returns the estimated number of
rows in the result table for the prepared statement. Otherwise, the
value zero is returned.

Given that ROW_COUNT doesn't mention OPEN whereas DB2_NUMBER_ROWS
does, I'm going to switch to DB2_NUMBER_ROWS.

However, it would seem that I'm likely to get only an estimate regardless...

Charles



On Fri, Jun 18, 2010 at 5:02 PM, Luis Rodriguez <luisro58@xxxxxxxxx> wrote:

Charles,
I would say after the OPEN. As my V5R3 SQL Reference Manual states:

"The rows of the result table can be derived during the execution of the
OPEN statement and a temporary table can be created to hold them; or they
can be derived during the execution of subsequent FETCH statements. In
either case, the cursor is placed in the open state and positioned before
the first row of its result table. If the table is empty the position of the
cursor is effectively “after the last row.” "

So it would seem that as soon as you do the OPEN you would have the number
of retrieved rows...

Regards,

Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries


On Fri, Jun 18, 2010 at 4:00 PM, Charles Wilt <charles.wilt@xxxxxxxxx>wrote:

Ok, looks like there's a DB2_NUMBER_ROWS / ROW_COUNT statement
information item I get get back using teh GET DIAGNOSTIC statement.

There's also SQLERRD(2) and SQLERRD(3)in the SQLCA....

Does anybody have any expirence using teh above with a dynamic SQL
statement that returns a cursor to the client.

Do I put the GET DIAGNOSTIC after the PREPARE or after the OPEN?

Thanks!
Charles

On Fri, Jun 18, 2010 at 3:42 PM, Charles Wilt <charles.wilt@xxxxxxxxx>
wrote:

I've got an SQL stored procedure that returns a cursor to the client.

Is there anyway to tell inside the stored proc, how many rows are
available to be returned to the client?

Running on v5r4.

Thanks!
Charles

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.