RE: Another SQL-newbie UDF question: qualifying with a library passed as a variable

James,

You can't include a parameter variable as the library in your SELECT
statement, but you can construct a SELECT statement and store it in a
variable and then use the EXECUTE IMMEDIATE statement to run it.

For example:

SELECT TBLID INTO TBL from FOO where dfid = i_fldid;

becomes

declare select1 char(250);
SET select1 = 'SELECT TBLID INTO TBL from ' || i_lib || '/FOO where
dfid = ' || i_fldid;
EXECUTE IMMEDIATE select1;

I'm not where I can test this out, but it should work.


Another possibility would be to use the SET PATH statement. As in:

SET PATH = i_lib;


Hope this helps!

Richard

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of James Lampert
Sent: Friday, April 29, 2011 12:46 PM
To: Midrange Systems Technical Discussion
Subject: Re: Another SQL-newbie UDF question: qualifying with a library
passed as a variable

Dennis wrote:

Yes. See PREPARE and EXECUTE IMMEDIATE statements.

Hmm. I'm not entirely sure how (or even if) this would work for the
issue at hand:

What I have is along the lines (simplified and censored) of:

create function displayval(i_fldid NUMERIC,
i_key VARCHAR(10))
returns varchar(50)
language sql deterministic not fenced
begin
declare result char(50);
declare tbl char(11);
if i_key = ' ' then return ' '; end if;
SELECT TBLID INTO TBL from FOO where dfid = i_fldid;
select DEF INTO result from BAR
where PTBLE = substring(tbl from 1 for 3)
and PCODE = substring(i_key from 1 for 5)
and STBLE = ' ' and SCODE = ' ';
RETURN RESULT;
END


What I'd like to have would add a third parameter:

create function wintouch/displayval(i_fldid NUMERIC,
i_key VARCHAR(10) i_lib varchar(10))

and then qualify FOO and BAR with i_lib.

Or otherwise guarantee that FOO and BAR are both the ones in i_lib, and
not from some other library.