From: scott.marlowe <scott.marlowe@ihs.com>
To: Jan Wieck <JanWieck@yahoo.com>
Cc: Stephan Szabo <sszabo@megazone.bigpanda.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Enio Schutt Junior <enio@pmpf.rs.gov.br>
Cc: pgsql-sql@postgresql.org
Subject: Re: Sometimes referential integrity seems not to work
Date: Mon, 2 Feb 2004 11:40:01 -0700 (MST)
Message-ID: <Pine.LNX.4.33.0402021138340.19673-100000@css120.ihs.com> (raw)
In-Reply-To: <401E80D2.9080909@Yahoo.com>
On Mon, 2 Feb 2004, Jan Wieck wrote:
> Stephan Szabo wrote:
>
> > On Sat, 31 Jan 2004, Tom Lane wrote:
> >
> >> Stephan Szabo <sszabo@megazone.bigpanda.com> writes:
> >> > On Mon, 26 Jan 2004, Enio Schutt Junior wrote:
> >> >> In a database I am working, I sometimes have to delete all the records in
> >> >> some tables. According to the referential integrity defined in the creation
> >> >> of the tables, postmaster should not delete the records, but it does. I have
> >> >> used the following commands: "delete from table_1" and "truncate table_1".
> >> >> ...
> >> >> can the postgres user delete records despite referential integrity?
> >>
> >> I think the first PG release or two that had TRUNCATE TABLE would allow
> >> you to apply it despite the existence of foreign-key constraints on the
> >> table. Recent releases won't though.
> >
> > Yeah, truncate didn't worry me much, but the implication that delete from
> > table_1; worked did.
>
> TRUNCATE cannot be used inside of a transaction, and since 7.3 it checks
> for foreign keys. So I guess Enio is getting but ignoring the error
> message when trying the delete, but then the truncate does the job in
> his pre-7.3 database.
Yes it can. I think it was starting in 7.3.
=> select * from test2;
info
-------------
abc'123
123
(2 rows)
=> begin;
BEGIN
=> truncate test2;
TRUNCATE TABLE
=> rollback;
ROLLBACK
=> select * from test2;
info
-------------
abc'123
123
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: scott.marlowe@ihs.com, JanWieck@yahoo.com, sszabo@megazone.bigpanda.com, tgl@sss.pgh.pa.us, enio@pmpf.rs.gov.br
Subject: Re: Sometimes referential integrity seems not to work
In-Reply-To: <Pine.LNX.4.33.0402021138340.19673-100000@css120.ihs.com>
* 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