Re: Need help on triggers - postgres 9.1.2 - Mailing list pgsql-general

Hi all

Something it's tricky for me here, see my trigger I wrote below. What can I
do to insert c_code from center table  INTO center_changed table with ONLY
the c_code where the update was made or where an INSERT of the new entry
INTO center table what made  .


Let's say the center table has got the following values. When I try to
change c_dsc from KITWE to KIT where c_code ='0204' the trigger should take
cde 0204 and insert it into center_changed table with a time stamp. So the
main problem I have it's to populate the table called center_changed.


c_cde |                    c_desc                     | c_active
--------+------------------------------------------------+----------
 0094   | GABORONE WAREHOUSE                             | f
 0204   | KITWE                                          | t






CREATE TABLE center_changed (
    c_cde            text   NOT NULL,
    stamp             timestamp NOT NULL
);

CREATE OR REPLACE FUNCTION check_center_changes() RETURNS TRIGGER AS
$center_changed$

BEGIN

        IF (TG_OP = 'UPDATE') THEN
            INSERT INTO center_changed SELECT c_cde, now();
            RETURN NEW;
        ELSIF (TG_OP = 'INSERT') THEN
            INSERT INTO center_changed SELECT c_cde, now();
            RETURN NEW;
        END IF;
        RETURN NULL;
END;
$center_changed$ LANGUAGE plpgsql;

CREATE TRIGGER center_changed
AFTER INSERT OR UPDATE ON center
        FOR EACH ROW EXECUTE PROCEDURE check_center_changes();








-----Original Message-----
From: Khangelani Gama [mailto:kgama@argility.com]
Sent: Wednesday, May 21, 2014 9:34 PM
To: 'Adrian Klaver'; 'pgsql-general@postgresql.org'
Subject: RE: [GENERAL] Need help on triggers - postgres 9.1.2

Thank you very much, I will have a look.

-----Original Message-----
From: Adrian Klaver [mailto:adrian.klaver@aklaver.com]
Sent: Wednesday, May 21, 2014 3:20 PM
To: Khangelani Gama; pgsql-general@postgresql.org
Subject: Re: [GENERAL] Need help on triggers - postgres 9.1.2

On 05/21/2014 02:54 AM, Khangelani Gama wrote:
> Hi
>
> I have a postgres 9 database, inside this database I need to create a
> new table called *center_changed* that gets inserted by any change
> that take place in a table called *center*. So I need to create
> trigger to do this.
>
> *Example: *
>
> Table name*: center*(c_cde, c_dsc, ops_cde, grp_cde);
>
> Now on the table called *center , *I need to create an INSERT and
> UPDATE trigger will insert the *c_cde * of the inserted or updated
> *center* into the *center_changed* table
>
> Please help me
>
> I have this syntax below, but please help me with the overall query.
>
> CREATE TRIGGER check_center
>
>                 BEFORE INSERT OR UPDATE
>
>                 ON *cente*r FOR EACH ROW
>
>                 EXECUTE PROCEDURE check_center_changes();

See here:

http://www.postgresql.org/docs/9.3/interactive/plpgsql-trigger.html

Example 40-4. A PL/pgSQL Trigger Procedure For Auditing

>
> Thanks
>

--
Adrian Klaver
adrian.klaver@aklaver.com


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