RE: Conditional SQL processing against host variables

Dang it, where's my "take back" button? I misread the message.

Sorry.
++
Dennis
++
"I find television very educating. Every time somebody turns on the set I go into the other room and read a book."
-- Groucho Marx



Sent from my Galaxy tablet phone. Please excuse my brevity.
For any grammatic/spelling errors, there is no excuse.
++


"Dennis" <iseries@xxxxxxxxxxxx> wrote:

This will match on DEVICE='*ANY' whether you want it to or not. (Maybe
not a big concern, but...)

I would put the HOST-VARIABLE vs. CONSTANT test first, as I believe
that will be evaluated only one time, and (as per prior messages)
placing it first should avoid a performance hit.
++
Dennis
++
"If I had my life to live again, I'd make the same mistakes, only
sooner."
-- Tallulah Bankhead


Sent from my Galaxy tablet phone. Please excuse my brevity.
For any grammatic/spelling errors, there is no excuse.
++


"Schutte, Michael D" <Michael_Schutte@xxxxxxxxxxxx> wrote:

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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