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Hi,

Within RPG you need to define the third parameter with Options(*NOPASS:
*OMIT).
Then you can register 2 functions (one with 2 and the other with 3
parameters) with the same SQL Name based on the same RPG function.
The overloaded SQL Function will send a *NULL-Pointer for the third not
passed parameter.
Within your RPG procedure you need to check %PARMS if it is called by RPG
with or without optional parameters and check %ADDR(Parm) = *NULL for the
third optional parameter if it is called by SQL.

For example:
If %Parms >= 3 or %Addr(Parm3) <> *NULL;
//3rd parameter is passed
EndIf;

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: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von sjl
Gesendet: Tuesday, 01. December 2009 21:46
An: midrange-l@xxxxxxxxxxxx
Betreff: Overloaded UDF

I have created an SQL UDF using RPG code that accepts two parameters, and I
want to add an optional third parameter.

As a test, I added an optional third parameter to the sub-procedure in the
service program (and created the function again using the same name except
with 3 parms), thinking that I could check to see how many parms are being
passed to the RPG program by examining the value of %PARMS. However, %PARMS

is -1, regardless of the number of parms that I pass via my UDF call (either

2 or 3).

As a Q&D fix, I used a Monitor block when referencing the 3rd parm, but I
would like to understand what is really happening under the covers.

Code snippet here: http://code.midrange.com/d072fb0fec.html

Regards,
sjl




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