Re: Converting mysql "on update" to postgres "rule" - Mailing list pgsql-general

You're looking for a trigger, not a rule.

On Tue, 25 Mar 2008, Edward Blake wrote:

> Thanks to everyone who's helped me before.
>
> I'm trying to create the following mysql table in postgres:
>
> CREATE TABLE visit (
>     data1 varchar(30) NOT NULL,
>     data2 varchar(30) DEFAULT NULL,
>     data3 timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE
> CURRENT_TIMESTAMP);
>
> Thus far, I've been able to get this far:
> CREATE TABLE visit (
>     data1 varchar(30) NOT NULL,
>     data2 varchar(30) DEFAULT NULL,
>     data3 timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP);
> CREATE RULE timestamp_update AS ON UPDATE TO visit
>     DO ALSO
>     UPDATE vist
>          SET data3 = CURRENT_TIMESTAMP;
>
> I've tried multiple iterations of how to accomplish this and keep getting
> stuck. With the one above, postgres yells and says:
> ERROR:  infinite recursion detected in rules for relation "visit"
>
> Any ideas?
>