Re: after update trigger ?

On Fri, Apr 22, 2011 at 7:23 PM, tmoore <tmoore(at)ttitech(dot)net> wrote:

> Can an after update trigger function do an insert into the the same table ?
>

Yes, we can do and code snippet as follows::

1. Fetch records from Existing Table

postgres=# SELECT * FROM NEW_EMP;
eno | ename | sal
-----+--------+-------
1 | xx | 9000
2 | ABC | 90000
(2 rows)

2. Create a function
CREATE OR REPLACE FUNCTION RAGHU() RETURNS TRIGGER
AS
$$
BEGIN
INSERT INTO NEW_EMP VALUES(1,'RAGHU',90000);
RETURN NEW;
END;
$$
LANGUAGE PLPGSQL;

3. Create a trigger
CREATE TRIGGER RAGHU_TRI AFTER UPDATE ON NEW_EMP FOR EACH ROW
EXECUTE PROCEDURE RAGHU();

4. Update the records in "NEW_EMP" table

postgres=# UPDATE NEW_EMP SET ENAME='RAJESH' WHERE ENO=2;
UPDATE 1

5. Fetch Records from "NEW_EMP" Table

postgres=# SELECT * FROM NEW_EMP;
eno | ename | sal
-----+--------+-------
1 | XX | 9000
2 | RAJESH | 90000
1 | RAGHU | 90000

Thanks & Regards
Raghu Ram
EnterpriseDB Corporation
The Enterprise PostgreSQL Company

>
> Thanks
> Tom
>
>
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