Re: [GENERAL] Creating rule for sliding data

Hi,

On Sun, 2011-10-09 at 18:50 +0200, F. BROUARD / SQLpro wrote:
> I am answering to myseilf...
>
> the good syntax is something like :
>
>
> CREATE RULE R_U_MSR_BEFORE2000x
> AS
> ON UPDATE TO T_MESURE_MSR
> WHERE ( NEW.MSR_DATE < DATE '2000-01-01' )
> DO INSTEAD
> (
> -- rows does not change partition :
> UPDATE T_MESURE_BEFORE2000_MSR
> SET MSR_ID = NEW.MSR_ID,
> MSR_DATE = NEW.MSR_DATE,
> MSR_MESURE = NEW.MSR_MESURE
> WHERE ( OLD.MSR_DATE < DATE '2000-01-01' );
> -- rows does change partition (first INSERT NEWs then DELETE OLDs)
> INSERT INTO T_MESURE_MSR
> SELECT MSR_ID,
> MSR_DATE,
> MSR_MESURE
> FROM NEW
> WHERE NOT ( OLD.MSR_DATE < DATE '2000-01-01' ); ;
> DELETE FROM T_MESURE_MSR
> WHERE MSR_ID = OLD.MSR_ID
> AND MSR_DATE = OLD.MSR_DATE
> AND MSR_MESURE = OLD.MSR_MESURE
> AND NOT ( OLD.MSR_DATE < DATE '2000-01-01' );
> );
>
> The problem is nowhere in the doc there is a mention where much more
> than one commande must be place into brackets !
>

As a matter of fact, it does:

CREATE [ OR REPLACE ] RULE name AS ON event
TO table [ WHERE condition ]
DO [ ALSO | INSTEAD ] { NOTHING | command | ( command ; command ... ) }

^ ^
| |
See -----------------------------------------+------------------------

Extract from
http://www.postgresql.org/docs/9.1/interactive/sql-createrule.html

--
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com