RE: Embedded SQL question

Doug,

Repeat after me....

"If I'm using an SQL cursor, I'm probably wrong."

SQL is designed for set at a time processing. By using a cursor you're cutting of a leg and expecting
it to run fast. It's not going to happen.

Sometimes, you have to use a cursor...most of the time, RPG programmers use one when they shouldn't
because record at a time processing is what they are used to.


What are you doing with the extracted data?

Putting it into another file?
--use the "INSERT INTO <...> SELECT <...>" form of the insert statement.

Displaying on screen or a report?
--ok cursor's (probably) needed here, but use a multi-row fetch if you want SQL to perform better than
RPG native I/O.



HTH,
Charles

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Doug Palme
Sent: Tuesday, July 31, 2007 3:13 PM
To: 'RPG programming on the AS400 / iSeries'
Subject: Embedded SQL question

I have not worked with embedded sql in a looooong time but I
have a project that will afford me an opportunity to work
with it again.



I have two physical files that I need to extract some data
from mainly customer number and name but it is based upon
data that is in the second PF.



Here is the way I have the select statement defined:



*---> Prepare SQL Statement for Select

C/EXEC SQL

C+ DECLARE C1 CURSOR FOR

C+ SELECT SLACCT, CCUSNR, CCUSNM, CSTATE, CSTMTL

C+ FROM SLSTRNL5, CORCUSTM

C+ WHERE CSTATE='MN' AND

C+ SLACCT = CCUSNR AND

C+ CSTMTL = :ZTYPE

C/END-EXEC



The only pieces of information I really need is the CCUSNR
and the CCUSNM fields, the rest of them are strictly present
for testing the records...



Is there an easy way to fetch those two fields into a work
file I have without having to include the other fields?







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