From: John DeSoi <desoi@pgedit.com>
To: Aaron Bono <postgresql@aranya.com>
Cc: Thusitha Kodikara <kthusi@yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Triggers using PL/pgSQL
Date: Mon, 31 Jul 2006 11:53:46 -0400
Message-ID: <D1B84C5C-99EA-4DA3-B5EC-22D03CFC1CB8@pgedit.com> (raw)
In-Reply-To: <bf05e51c0607310759m64d39c45n73aa6060c871b46f@mail.gmail.com>
References: <20060731041644.32247.qmail@web56610.mail.re3.yahoo.com>
<bf05e51c0607302152k2801caflc9040d99af7b2816@mail.gmail.com>
<7F7548C8-249E-44E2-8205-6C055671DA19@pgedit.com>
<bf05e51c0607310759m64d39c45n73aa6060c871b46f@mail.gmail.com>
On Jul 31, 2006, at 10:59 AM, Aaron Bono wrote:
> On 7/31/06, John DeSoi <desoi@pgedit.com> wrote:
> Is it really necessary to build a SQL string and use execute? It
> seems you could just issue the INSERT statement.
>
> I don't think so but there was some discussion a week or two ago
> about mixing variables and using execute. I am curious, does
> anyone know what the "best" approach is?
I did not test with older versions, but it seems to work fine with 8.1:
CREATE OR REPLACE FUNCTION my_table_history_fn () returns trigger as
'
BEGIN
-- if a trigger insert or update operation occurs
IF TG_OP = ''INSERT'' OR TG_OP = ''UPDATE'' THEN
insert into my_table_history (
my_table_id,
my_value,
create_dt
) VALUES (
NEW.my_table_id,
NEW.my_value,
now()
);
RETURN NEW;
END IF;
END;
'
LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;
insert into my_table values (1, 'test1');
insert into my_table values (2, 'test2');
update my_table set my_value = 'test3' where my_table_id = 1;
select * from my_table_history;
=== psql 9 ===
my_table_id | my_value | create_dt
-------------+----------+----------------------------
1 | test1 | 2006-07-31 11:47:33.080556
2 | test2 | 2006-07-31 11:47:48.221009
1 | test3 | 2006-07-31 11:48:21.029696
(3 rows)
John DeSoi, Ph.D.
http://pgedit.com/
Power Tools for PostgreSQL
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To: pgsql-sql@postgresql.org
Cc: desoi@pgedit.com, postgresql@aranya.com, kthusi@yahoo.com
Subject: Re: Triggers using PL/pgSQL
In-Reply-To: <D1B84C5C-99EA-4DA3-B5EC-22D03CFC1CB8@pgedit.com>
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