am 07.06.2006, um 13:23:09 +0200 mailte peter pilsl folgendes: > > I dont succeed with writing my rules proper. > > I need the following rules: > > when I INSERT/UPDATE to a table and a certain condition is true then a > special field in this data-row should be updated to. > > > I came as far: > > # \d testa > Table "public.testa" > Column | Type | Modifiers > --------+------+----------- > x1 | text | > x2 | text | > Rules: > r1 AS > ON INSERT TO testa > WHERE new.x1 = 'house'::text DO UPDATE testa SET x2 = 'mouse'::text > > > this works fine. When I insert a row with x1=house then x2 gets set to > mouse. > > BUT: > > i) it always updates all rows in the tables instead of only the current > row. I guess this is a huge performance-lack on big tables :) I tried to > get a where oid=new.oid in or something like that, but it did not work.
My suggestion: write a TRIGGER for this. Examples for TRIGGER: http://www.postgresql.org/docs/8.1/interactive/plpgsql-trigger.html HTH, Andreas -- Andreas Kretschmer (Kontakt: siehe Header) Heynitz: 035242/47215, D1: 0160/7141639 GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net === Schollglas Unternehmensgruppe === ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
