Re: PD: triggered data change violation on relation "tbl_b"

You cannot insert and delete the same data within one transaction.
Only one change of a row is allowed.

Greetings
Andreas

On Wed, 29 Aug 2001 13:18:02 +0200
"Pawel Pawlowski" <pawel(dot)pawlowski(at)breitenbach(dot)pl> wrote:

> When I insert to table new row and after this in the same transaction I delete this row I get such error:
> triggered data change violation on relation "tbl_b"
>
> I've created database using simple script:
>
> CREATE TABLE tbl_a
> (
> pn_id SERIAL,
> pn_a VARCHAR(400) NOT NULL,
> PRIMARY KEY (pn_id)
> );
> CREATE TABLE tbl_b
> (
> pc_id INT4 NOT NULL REFERENCES tbl_a (pn_id) ON UPDATE CASCADE ON DELETE CASCADE,
> pc_b VARCHAR(40) NOT NULL,
> PRIMARY KEY (pc_id, pc_b)
> );
> INSERT INTO tbl_a VALUES (1, 'xxx');
>
> And this is the sample script that I use to generete this bug:
>
> begin transaction;
> insert into tbl_b values (1, 'xxx');
> delete from tbl_b where pc_id=1;
> ERROR: triggered data change violation on relation "tbl_b"
>
> How to solve this problem ?????

------------------------------
Andreas Wernitznig
Insilico Software GmbH
E-Mail: andreas(at)insilico(dot)com
Web: www.insilico.com
------------------------------