Обсуждение: create function problem

I've used the following sql to create the function and
function creation is also successful.

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';

executing this function as 
select usage('kancha');

returns no records. while executing the query directly
replacke $1 with kancha returns result. Where did i go
wrong ??

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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).

Regards
--
Matteo Beccati
C.R.P. Software S.r.l.
http://www.crpsoftware.it/

> 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 $1 will give error like following:
Unable to identify an operator '=$' for types
'varchar' and 'int4'       You will have to retype this query using an
explicit cast



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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
variablename.
 
   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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