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  3. April 2006

Specify null parameter for SQL UDF

Hi Everyone,
How do I call a UDF with a null parameter? I have a UDF created to return the accounting month for a given date (the only parameter), but if no parameter is given, it will return the current accounting month. 

It works fine when I pass it a date, e.g.

SELECT ACCTGMONTH(CURRENT_DATE) FROM ANYFILE

but complains (says it cannot find ACCTGMONTH) if I use it like this:

SELECT ACCTGMONTH() FROM ANYFILE
I understand that it identifies a UDF based on the name and the input parameter types, but I don't understand how to tell it a particular parameter may be optional. 

I created it with the following:

create function UTLIB/ACCTGMONTH (date) returns integer
language RPGLE parameter style GENERAL WITH NULLS not deterministic no SQL called on null input no external action external name 'UTLIB/SVCBUS(ACCTGMONTH)'
ACCTGMONTH is a procedure within a service program, with prototype like this:
d AcctgMonth... d pr 10i 0 d amDate d const d amDateNull 10i 0 d amResultNull 10i 0 

*Peter Dow* /
Dow Software Services, Inc.
909 793-9050
pdow@xxxxxxxxxxxxxxx <mailto:pdow@xxxxxxxxxxxxxxx> /

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