From: Michael Fuhr <mike@fuhr.org>
To: Richard Huxton <dev@archonet.com>
Cc: abief_ag_-postgresql@yahoo.com
Cc: pgsql-sql@postgresql.org
Subject: Re: transactions in functions, possible bug or what I'm doing
Date: Fri, 19 Nov 2004 09:23:09 -0700
Message-ID: <20041119162309.GA77593@winnie.fuhr.org> (raw)
In-Reply-To: <419DEE1B.6010805@archonet.com>
References: <20041119115231.27648.qmail@web13924.mail.yahoo.com>
<419DEE1B.6010805@archonet.com>
On Fri, Nov 19, 2004 at 12:59:07PM +0000, Richard Huxton wrote:
> You can have what are called "savepoints" in version 8.0 though, which
> lets you trap errors and rollback to a named (saved) point in your function.
Savepoints in functions don't work as of 8.0.0beta4, unless I'm
doing something wrong:
CREATE TABLE foo (id SERIAL PRIMARY KEY, name TEXT NOT NULL);
CREATE FUNCTION fooins(TEXT) RETURNS BOOLEAN AS $$
BEGIN
SAVEPOINT x;
INSERT INTO foo (name) VALUES ($1);
ROLLBACK TO x;
RETURN TRUE;
END;
$$ LANGUAGE plpgsql;
BEGIN;
SELECT fooins('John');
ERROR: SPI_execute_plan failed executing query "SAVEPOINT x": SPI_ERROR_TRANSACTION
CONTEXT: PL/pgSQL function "fooins" line 2 at SQL statement
Error trapping does work, however:
CREATE FUNCTION fooins(TEXT) RETURNS BOOLEAN AS $$
BEGIN
INSERT INTO foo (name) VALUES ($1 || '-1');
BEGIN
INSERT INTO foo (id, name) VALUES (currval('foo_id_seq'), $1 || '-2');
EXCEPTION
WHEN unique_violation THEN
NULL;
END;
INSERT INTO foo (name) VALUES ($1 || '-3');
RETURN TRUE;
END;
$$ LANGUAGE plpgsql;
SELECT fooins('John');
fooins
--------
t
(1 row)
SELECT * FROM foo;
id | name
----+--------
1 | John-1
2 | John-3
(2 rows)
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: mike@fuhr.org, dev@archonet.com, abief_ag_-postgresql@yahoo.com
Subject: Re: transactions in functions, possible bug or what I'm doing
In-Reply-To: <20041119162309.GA77593@winnie.fuhr.org>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox