From: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: question |
Date: | 2008-10-08 04:59:46 |
Message-ID: | 20081008045946.GA12115@a-kretschmer.de |
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Thread: | |
Lists: | pgsql-general |
am Tue, dem 07.10.2008, um 21:20:53 -0400 mailte Tom Lane folgendes:
> Luis Castillo <luiscastillor(at)gmail(dot)com> writes:
> > I would like to know how can I control in my database the rows that a
> > user has inserted. I mean many users can insert information in a table
> > but when trying to update the information I want that a user can change
> > only those rows inserted by him. Is this possible with Postgresql?
>
> Sure, if you add a column that records which user inserted the row, and
> then make a BEFORE UPDATE trigger that throws an error if it doesn't
> match.
Additional, create a text-column with default current_user for the
inserts. Example:
kretschmer(at)pegasus:~$ psql -U kretschmer test
...
test=> create table usertab (id serial, username text default current_user);
NOTICE: CREATE TABLE will create implicit sequence "usertab_id_seq" for serial column "usertab.id"
CREATE TABLE
test=*> insert into usertab values(default, default);
INSERT 0 1
test=*> select * from usertab;
id | username
----+------------
1 | kretschmer
(1 row)
Andreas
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Andreas Kretschmer
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