RULES

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I need something like this .....

CREATE RULE piezas_add AS
ON insert TO piezas
DO update materia_prima set usadas=(usadas+1)
where n_material=new.n_material;

CREATE RULE piezas_delete AS
ON delete TO piezas
DO update materia_prima set usadas=(usadas-1)
where n_material=old.n_material;

Inserting all is OK.
... but in deleting operations nothing changes.

Can someone help me ??

And .... i would like to do the same when updating ....

Can i do something like this ??
What is the rigth syntax ??
Must i create 2 rules to perform the action ???

CREATE RULE piezas_update AS
ON update TO piezas.n_material
DO
update materia_prima set usadas=(usadas-1) where
n_material=old.n_material
???WHAAAT???
update materia_prima set usadas=(usadas+1) where
n_material=new.n_material


thanks !!!

fer

- --
Fernando Moyano

Frase del día:
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El que retiene algo que no necesita es igual a un ladrón. (M Gandhi)

(*) SymeX ==> http://symex.lantik.com
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