Re: recursive inner trigger call - Mailing list pgsql-general

Hi Dave,

when i use before trigger , nothing happen; i mean no cumputation is done  (and when i start tu duplicate the same data just by mistake ...)

i got the same error.

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From: "Gauthier, Dave" <dave.gauthier@intel.com>
To: Red Light <skydelta98@yahoo.com>; "pgsql-general@postgresql.org" <pgsql-general@postgresql.org>
Sent: Thursday, December 1, 2011 8:09 PM
Subject: RE: [GENERAL] recursive inner trigger call

You set the trigger to fire off whenever ed_expore.bv is inserted or updated.  Then the trigger updates ed_explore.bv, which fires the update trigger again, etc... .  Infinite loop.  No?

 

Maybe you just want to use a before trigger to set that value before the insert, then you wouldn't need the recursive after trigger?

 

 

 

 

From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Red Light
Sent: Thursday, December 01, 2011 1:58 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] recursive inner trigger call

 

Hi guys,

 

i got the following problematic : i got a table called bv that have some 'entry data' and i have another column that need to be calculated and put back in the table:

 

 

here is my table:

 

 

CREATE TABLE public.bv
(
  id_bv integer NOT NULL,
  c_vmax_actuel real,
  d_capacite_barrages_new real,
  CONSTRAINT "BV_pkey" PRIMARY KEY (id_bv) 
)
WITH (
  OIDS=FALSE
);
ALTER TABLE public.bv OWNER TO postgres;

 

 

i created a trigger that do the necessary computation:

 

CREATE OR REPLACE FUNCTION public.store_bv() RETURNS TRIGGER AS $store_bv$
    DECLARE
        v_vmax_actuel          numeric(15,2);
    BEGIN      
    IF (TG_OP = 'UPDATE') OR (TG_OP = 'INSERT')   THEN
       
        update ed_explore."bv"  set
        c_vmax_actuel = ((d_capacite_barrages_new) / (30*86400)) ;             
    END IF;
    RETURN NEW;


    END;
$store_bv$ LANGUAGE plpgsql;

 

 

the declaration of my trigger :

 

CREATE   TRIGGER store_bv_trigger
after INSERT OR UPDATE  ON ed_explore.bv
    FOR EACH ROW EXECUTE PROCEDURE public.store_bv();

 

 

and now i start to insert my data:

 

insert into public.bv (id_bv,d_capacite_barrages_new) values (1,7324591);commit;

 

 

 

then the trigger got executed and goes in an infinite loop,here is the error that i got :

 

ERREUR:  dépassement de limite (en profondeur) de la pile
HINT:  Augmenter le paramètre « max_stack_depth » après vous être assuré que la
limite de profondeur de la pile de la plateforme est adéquate.
CONTEXT:  instruction SQL « update ed_explore."bv" set c_vmax_actuel = ((d_capacite_barrages_new) / (30*86400)) »

 

 

 

And thanks for you help