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