RE: Quick SQL expression evaluation

Hey Dennis, pardon my ignorance, but I've never scene that (SQLEVAL)
used
before.

Is that something that you used in your RPG?

David

www.dancik.com



"Dennis Lovelady" <iseries@xxxxxxxxxxxx>
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RE: Quick SQL expression evaluation






There's no reason you cannot do this. In fact, I just now used the
code I
posted, to evaluate this "expression" :

SQLEVAL *INT EXPR('SELECT COUNT(*) FROM MYTABLE WHERE SOMECOLUMN > 47')

Worked fine.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"Advice is what we ask for when we already know the answer but wish we
didn't."
-- Erica Jong

For a straight-forward SELECT yes, but if you needed/wanted to use a
dynamic SELECT, it would be nice.
Perfect example would be I'm building a SELECT statement based on
Filters,
that will construct me a
WHERE clause dynamically, and I wanted to see the record count of

that

filter.

dav


David L. Mosley, Jr.
Technical Solutions Architect
Dancik International, Ltd.
2000 CentreGreen Way, Suite 250
Cary, NC 27513

www.dancik.com



Charles Wilt <charles.wilt@xxxxxxxxx>
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Re: Quick SQL expression evaluation






You don't need to use dynamic SQL for COUNT(*)

exec sql
select count(*) into :myResult
from item;

Works fine.

Charles

On Tue, May 25, 2010 at 10:10 AM, <dmosley@xxxxxxxxxx> wrote:

That's an interesting trick. I would have hoped that some like

using

"SELECT COUNT(*) INTO ? FROM ITEM" would work the same.

/Free
String = 'SELECT COUNT(*) INTO ? FROM ITEM';
/Exec SQL Prepare DynSQL From :String;
/Exec SQL Execute DynSQL using :MyResult;
Dsply MyResult;
/End-Free

David L. Mosley, Jr.
Technical Solutions Architect
Dancik International, Ltd.
2000 CentreGreen Way, Suite 250
Cary, NC 27513

www.dancik.com



Luis Rodriguez <luisro58@xxxxxxxxx>
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Re: Quick SQL expression evaluation






Wow!! Thanks Birgitta!! ..

One can always trust that you will find the solution to almost any

SQL

problem, this one will go into the archives.


Best Regards,

Luis Rodriguez
IBM Certified Systems Expert â eServer i5 iSeries


On Tue, May 25, 2010 at 8:21 AM, Birgitta Hauser
<Hauser@xxxxxxxxxxxxxxx>wrote:

Try the following:

D MyResult S 11P 2
D String S 256A Varying
D Expr S 256A Varying inz('2 + 2')
/Free
String = 'Values(' + Expr + ') into ?';
/Exec SQL Prepare DynSQL From :String;
/Exec SQL Execute DynSQL using :MyResult;
Dsply MyResult;
/End-Free




Mit freundlichen GrÃÃen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the

stars."

(Les

Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not

training

them

and keeping them!"

-----UrsprÃngliche Nachricht-----
Von: rpg400-l-bounces@xxxxxxxxxxxx

[mailto:rpg400-l-bounces@xxxxxxxxxxxx]

Im
Auftrag von Dennis Lovelady
Gesendet: Tuesday, 25. May 2010 14:30
An: 'RPG programming on the IBM i / System i'
Betreff: Quick SQL expression evaluation

I am trying to write a procedure I thought would be extremely

simple:

a

short SQL evaluation program that would simply take an expression

and

return
the result of SQL operating on that expression. For a silly

example:

Exec sql set :myResult = 2 + 2 ;



To minimize complexity, I am passing the '2 + 2' part as a string,

so

that

the meat of this very short procedure is:

Exec sql setl :myResult = :myExpression ;



But (and, yes, I know I should have expected this) SQL is seeing

it

as

the

string "2 + 2" rather than a pair of values with an operator

between

them.

Is there an SQL verb/clause that informs the SQL processor that

the

following is an expression rather than a string (such as with

unix'

"expr"

command)? Or is this just a pipe dream, not worth the effort?



Dennis E. Lovelady
AIM/Skype: delovelady MSN: fastcounter@xxxxxxxxxxxx
<http://www.linkedin.com/in/dennislovelady>
www.linkedin.com/in/dennislovelady --
You can't have everything. Where would you put it?



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