Обсуждение: plpgsql rowtype

hi all,

i want to proof if if a rowtype has an attribute or get all attribute of a rowtype.

like:



CREATE OR REPLACE FUNCTION "test"() RETURNS varchar AS '
DECLARE

rs_refr_row rs_refr%ROWTYPE;


begin



if ( proofing if rs_feat_row.id exists ) then
select 1 into rs_feat_row.id;
end if;



RETURN rs_feat_row.id::varchar ;
end;
' LANGUAGE 'plpgsql'

best regards

heiko kehlenbrink

On Thu, 26 Jun 2003 11:47:47 +0200 (CEST)
Heiko.Kehlenbrink@vermes.fh-oldenburg.de wrote:

> i want to proof if if a rowtype has an attribute or get all attribute of a rowtype.

as far as i know - you can't. what would you need it for? do you need a proof for variable being of "text" type when
declaredas text? 
you declared it as rowtype - so it's rowtype.

depesz

On 30/06/03, Hubert Lubaczewski (hubert.lubaczewski@eo.pl) wrote:
> On Thu, 26 Jun 2003 11:47:47 +0200 (CEST)
> Heiko.Kehlenbrink@vermes.fh-oldenburg.de wrote:
>
> > i want to proof if if a rowtype has an attribute or get all
> > attribute of a rowtype.
>
> as far as i know - you can't. what would you need it for? do you need a proof for variable being of "text" type when
declaredas text? 
> you declared it as rowtype - so it's rowtype.

Why don't you make a type with the fields you want. Set these to a
default value. Then check for whether or not a variable has been set the
way you want it. (See below). Otherwise maybe all you need is to declare
a record type and select into that, and then check the variables.

Hope this helps.
Rory

CREATE TYPE view_object as (
    itemid                              VARCHAR,
    itemtype                            INT2,
    itemtitle                           VARCHAR
);

CREATE OR REPLACE FUNCTION fn_v3_object_view
    (integer, varchar, integer) RETURNS view_object
    AS '
DECLARE
    boardid                            ALIAS for $1;
    recone                             RECORD;
BEGIN
    resulter.itemid                     := '''';
    resulter.itemtype                   := 0;
    resulter.itemtitle                  := '''';

    SELECT INTO recone
        itemid, itemtype, itemtitle
    FROM
        objects
    WHERE
        n_boardid = boardid;

    IF NOT FOUND OR recone.itemid < 1 THEN
        RAISE NOTICE ''my error message'';
        RETURN resulter;
    END IF;

    resulter.itemid                     := recone.itemid;
    resulter.itemtype                   := recone.itemtype;
    resulter.itemtitle                  := recone.itemtitle;

    RETURN resulter;

END;'
    LANGUAGE plpgsql;
--
Rory Campbell-Lange
<rory@campbell-lange.net>
<www.campbell-lange.net>