Re: plpgsql errorcodes

>From: Andreas Kretschmer <andreas_kretschmer(at)despammed(dot)com>
>To: pgsql-interfaces(at)postgresql(dot)org
>Subject: Re: [INTERFACES] plpgsql errorcodes
>Date: Fri, 17 Dec 2004 17:52:00 +0100
>
>begin "Robert Wimmer" <seppwimmer(at)hotmail(dot)com> wrote:
> > i want the DB functionality to be done by the server. this means i want
>to
> > write functions like
>
> > CREATE FUNCTION insert_any(....) RETURNS INT AS '
> > BEGIN
>
> > END; '
> > LANGUAGE 'plpgsql'
>
> > returning an errorcode so i can map this errorcode to a message for the
>user
> > of the client. and i want to do this on the server without using any
>
>You can use RAISE to generate a error.
>
>end
>Andreas

hi andreas,

RAISE NOTICE wouldnt help, because it would never be executed if a runtime
error occurs. a short example.

CREATE TABLE dummy (
id SERIAL ...
name VARCHAR(20) ,
code INT CONSTRAINT codeNotUnique UNIQUE,
first DATE);

-- this function controls data before inserting
CREATE FUNCTION insert_dummy(TEXT, TEXT, TEXT) RETURNS INTEGER AS '
DECLARE dat DATE;
BEGIN
dat := CAST($3 AS DATE);
-- if an error occurs execution will be stopped i cant drop any notice
-- i would like todo something like
if ERROR != 0 THEN RETURN -1; END IF; -- cannot convert to date
INSERT INTO dummy(name, code, first) VALUES($1,$2,$3);
if CONSTRAINT-ERROR = codeNotUnique THEN RETURN -2 END IF;
-- you cant do that, you have to do the following
-- the SELECT will be done again internal from psql
SELECT INTO tmp * FROM dummy WHERE code = CAST($2 AS INTEGER);
IF FOUND THEN RETURN -2 END IF;
-- everything is OK
RETURN 0;
END; '
LANGUAGE plpgsql;

my problem is, all plpgsql does is fine. but you do not get any errorcode
during the function.
and outside the function the errormessages cannot be used the generate a
usefull errorcode.
its just some english text.

i hope you can understand what i am talking about,

bye sepp

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