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From: Jan Wieck <janwieck@yahoo.com>
Message-Id: <200203191425.g2JEPcL08516@saturn.janwieck.net>
Subject: Re: create function problem
In-Reply-To: <20020319100343.28739.qmail@web14902.mail.yahoo.com> from "Kancha
	." at "Mar 19, 2002 02:03:43 am"
To: "Kancha ." <kancha2np@yahoo.com>
Date: Tue, 19 Mar 2002 09:25:37 -0500 (EST)
Cc: Matteo Beccati <m.beccati@crpsoftware.it>,
	pgsql-sql@postgresql.org
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Kancha . wrote:
>
> > Hi,
> >
> > > create function usage(text)
> > > returns numeric
> > > as 'select ceil(sum(sessiontime)/60) from
> > ath_online
> > > where loginname=\'$1\' and  startdate >= (select
> > > startdate from cst_package where status=\'t\' and
> > > cid=(select cid from cst_customer where
> > > loginname=\'$1\'));'
> > > language 'sql';
> >
> > Try to replace \'$1\' with just $1 (i.e. loginname =
> > $1).
> >
>
> the argument is a string so it has to be enclosed in
> quotes and \ is to escape the quote. replacing with
> just $1 will give error like following:

    The  argument  is  a  string and $1 becomes a T_Param node of
    type "text" in your case, which is a perfectly  valid  string
    without  the quotes.  Don't get confused by the $ sign in the
    parameter name. $1 is treated like a variable name.

    Just  try  "exactly"  what  was  suggested,   including   the
    whitespaces surrounding the = operator. Write

        loginname = $1

    instead of

        loginname=$1

    This  does  not  only make the code more readable for humans.
    The parser likes it too.


Jan

>
>  Unable to identify an operator '=$' for types
> 'varchar' and 'int4'
>         You will have to retype this query using an
> explicit cast
>
>
>
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