Re: Quick SQL expression evaluation

[Luis Rodriguez <luisro58@xxxxxxxxx>]

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 — 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 Grüßen / 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!"
>
> -----Ursprüngliche 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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