Hello all,

I have a question with the SERIAL type. I want to use it for default
identification of table entries:

create table chuwee (
num serial primary key,
mesg varchar(50) not null
);

And all the inserts to this table I'm gonna log to this table:

create table chuwee_log (
id serial primary key,
date timestamp default current_timestamp,
num integer not null,
mesg varchar(50) not null
);

Logging will be done with this rule:

create or replace rule chuwee_rule as on insert to chuwee
do insert into chuwee_log (num, mesg)
values (new.num, new.mesg);


And all seems to work, but a sequence is called twice for inserts, and
logged "num"-s get a +1 value:

sunline=# insert into chuwee (mesg) values ('Hello, world!');
INSERT 9596671 1
sunline=# insert into chuwee (mesg) values ('Aquarium full of tequilla');
INSERT 9596673 1
sunline=# select * from chuwee_log;
id | date | num | mesg
----+----------------------------+-----+---------------------------
1 | 2007-09-08 16:18:26.707384 | 2 | Hello, world!
2 | 2007-09-08 16:18:58.711599 | 4 | Aquarium full of tequilla
(2 rows)

sunline=# select * from chuwee;
num | mesg
-----+---------------------------
1 | Hello, world!
3 | Aquarium full of tequilla
(2 rows)


How it can be cured, if any?

Best dishes,
Aleksandr.

---------------------------(end of broadcast)---------------------------
TIP 6: explain analyze is your friend

Aleksandr Vinokurov wrote:
>
> Logging will be done with this rule:
>
> create or replace rule chuwee_rule as on insert to chuwee
> do insert into chuwee_log (num, mesg)
> values (new.num, new.mesg);

Don't do logging with rules, do logging with triggers.

See mailing-list archives for details.

--
Richard Huxton
Archonet Ltd

---------------------------(end of broadcast)---------------------------
TIP 4: Have you searched our list archives?

http://archives.postgresql.org