Обсуждение: question on function definitions/casts

ANyway, I have another question for you guys.

      create function get_citation (int2, int2, int4)
    returns SETOF varchar AS
    'select citation from citations where aid=$1 and wid=$2 and byteloc=$3'
    LANGUAGE 'SQL'

At one point I retrieved this function from my psql db (I've taken over
from someone else) and I'm now in a position where I need to enter it again.
I got it using pg_dump -s (on the kind suggestion of Tom when I asked back
then).

However, when I enter it now, it just doesn't seem to like it.

I get:

Text=# create function get_citation (int2, int2, int4)
Text-# returns SETOF varchar AS
Text-# 'select citation from citations where aid=$1 and wid=$2 and byteloc=$3'
Text-# LANGUAGE 'SQL';
ERROR:  Unable to identify an operator '=$' for types 'int2' and 'int4'
        You will have to retype this query using an explicit cast
Text=#

I'm guessing this is a difference from an upgrade to psql?

I'm using:
[1:08pm] stephanus ~> psql -V
psql (PostgreSQL) 7.1.3

would this be something like:

cast(aid as int2)=$1
or
(int2 aid)=$1

I've read through the stuff in
http://www.ca.postgresql.org/users-lounge/docs/7.2/postgres/typeconv-oper.html
but I'm still confused.

Thanks,
--Cindy

On Wed, 20 Feb 2002, Cindy wrote:

> I get:
>
> Text=# create function get_citation (int2, int2, int4)
> Text-# returns SETOF varchar AS
> Text-# 'select citation from citations where aid=$1 and wid=$2 and byteloc=$3'
> Text-# LANGUAGE 'SQL';
> ERROR:  Unable to identify an operator '=$' for types 'int2' and 'int4'
>         You will have to retype this query using an explicit cast
> Text=#

Hmm, try putting a space between the = and the $<n>

Stephan Szabo writes:
 >On Wed, 20 Feb 2002, Cindy wrote:
 >
 >> I get:
 >>
 >> Text=# create function get_citation (int2, int2, int4)
 >> Text-# returns SETOF varchar AS
 >> Text-# 'select citation from citations where aid=$1 and wid=$2 and byteloc=
 >$3'
 >> Text-# LANGUAGE 'SQL';
 >> ERROR:  Unable to identify an operator '=$' for types 'int2' and 'int4'
 >>         You will have to retype this query using an explicit cast
 >> Text=#
 >
 >Hmm, try putting a space between the = and the $<n>
 >

Yep.  The irony of this, of course, is that the first problem I solved
with this saved definition is that SETOF was originally SET OF.
So...subtract spaces, add spaces...*sigh*

Thanks!
--
Cindy
ctmoore@uci.edu