Re: [NOVICE] create function pl/pgsql c langauge

Muhammad,

 If I understood correctly you need create the language Pl/PgSql... why
dont you just check for CREATELANG...

Ex: prompt># createlang pgplsql database


On Wed, 12 Mar 2003 14:38:44 +0000
(GMT) Muhammad Shariq Muzaffar <shariq77@yahoo.com> wrote:

> hi
> I have created a function in pl/pgsql for xid data
> type
>
> CREATE FUNCTION xid_neq(xid, xid) RETURNS bool AS
> 'BEGIN
> IF $2 IS NULL THEN
> return ''f'';
> ELSE
>   IF $1 IS NULL THEN
>     return ''f'';
>   ELSE return float4in(xidout($1)) <>
> float4in(xidout($2));
>   END IF;
> END IF;
> END'  LANGUAGE 'plpgsql' IMMUTABLE;
>
> with the operator <>
>
> CREATE OPERATOR public.<> (
> PROCEDURE = xid_neq,
> LEFTARG = xid,
> RIGHTARG = xid,
> COMMUTATOR ='<>',
> NEGATOR ='=',
> RESTRICT = neqsel,
> JOIN = neqjoinsel);
>
> Now, to implement above code I need Pl/PgSql installed
> on the database. To solve this problem i need to
> create this function in C language. As I am novice to
> linux and pgsql, i have tried my best to implement the
> above code in c language but unable to do so.
> According to the online help i got, i think i have to
> write the code in a file outside pgsql and then i have
> to compile it through gcc. Also i think i need
> postgres.h to complete the opeartion which is
> available only in the distribution code.
>
> The code i come up with for c langauage is
>
> bool xid_neq(xid arg1,xid arg2)
> {
>     if(arg1 isnull){
>         return (false);
>     }
>     else
>         if(arg2 isnull){
>             return(false);
>         }
>         else
>             return (arg1 != arg2);
> }
>
> How am i supoose to create the function now. I think i
> am very much confused in this new environment.
>
> please help...
>
> __________________________________________________
> Do You Yahoo!?
> Everything you'll ever need on one web page
> from News and Sport to Email and Music Charts
> http://uk.my.yahoo.com
>
> ---------------------------(end of
> broadcast)--------------------------- TIP 5: Have you checked our
> extensive FAQ?
>
> http://www.postgresql.org/docs/faqs/FAQ.html
>


-----------------------------
Renê Salomão
Ibiz Tecnologia -- www.ibiz.com.br
(011) 5579-3178 - R. 211