I prefer this method. I getting faster results with it.
Select TWS, TUSER, TTDTE
From tfile
Where :device in ('*ANY', TWS)
And :User in ('*ANY', TUSER);
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of darren@xxxxxxxxx
Sent: Thursday, August 11, 2011 1:28 PM
To: midrange-RPG RPG message board
Subject: Conditional SQL processing against host variables
Using something like the following statement, we take a pretty high
performance hit compared to writing multiple cursors for times when the
user has selected a wildcard (*ANY) as shown below. I suspect that the SQL
is actually looking for TUSER='*ANY' even though it will never find it, and
its not necessary. Is there a better way to condition this type of
operation? I'm aware of dynamic SQL, but its a bit of a pain for larger
statements.
/FREE
exec sql declare C1 cursor for
Select TWS
TUSER,
TTDTE
from TFILE
where (TWS = :Device or :Device = '*ANY')
And (TUser = :User or :User = '*ANY')
/END-FREE
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