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* function returning NULL?
@ 2001-04-30 08:56 Sandro Dentella <sandro.dentella@tin.it>
2001-04-30 14:24 ` Re: [INTERFACES] function returning NULL? Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: Sandro Dentella @ 2001-04-30 08:56 UTC (permalink / raw)
To: pgsql-interfaces
I'm trying to create a function that should return a date, and occasionally
NULL value. I can't see how to do that. I'm using pl/tcl.
CREATE FUNCTION "start" (text,text) RETURNS date AS '
regsub ^. $1 "$2" job
spi_exec "select start_date from jobs where job_code = ''$job''" {
if {[info exist start_date]} {
return $start_date
}
}
# return "2/2/2222" HERE I want NULL
return "2/2/2222"
'LANGUAGE 'pltcl';
That is to say I'd like to have a function that returns a date but under
some circumstancies it leave it blanck.
TIA
sandro
*:-)
--
Sandro Dentella *:-)
e-mail: sandro@ermit.it sandro.dentella@mi.infn.it
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: [INTERFACES] function returning NULL?
2001-04-30 08:56 function returning NULL? Sandro Dentella <sandro.dentella@tin.it>
@ 2001-04-30 14:24 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2001-04-30 14:24 UTC (permalink / raw)
To: Sandro Dentella <sandro.dentella@tin.it>; +Cc: pgsql-interfaces; pgsql-docs@postgresql.org
Sandro Dentella <sandro.dentella@tin.it> writes:
> I'm trying to create a function that should return a date, and occasionally
> NULL value. I can't see how to do that. I'm using pl/tcl.
You need the "return_null" command, which is new in 7.1 --- before that
there was no way to do it in pltcl.
"return_null" seems to be missing from the documentation :-(. No wonder
you couldn't find it.
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
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2001-04-30 08:56 function returning NULL? Sandro Dentella <sandro.dentella@tin.it>
2001-04-30 14:24 ` Tom Lane <tgl@sss.pgh.pa.us>
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