Re: Trigger to keep track of table changes

n the end I solved this through 'Divide and conquer' - I split the trigger
into three parts and now it works (though I am not sure yet why the
original trigger does not work):

    CREATE OR REPLACE FUNCTION taxon_history_delete() RETURNS trigger
AS $BODY$BEGIN
    IF TG_OP = 'DELETE' THEN
        INSERT INTO history.taxon(operacao, data, tecnico, original_oid, taxon)
        VALUES ('DELETE', current_timestamp, current_user, old.oid, old.taxon);
        RETURN old;
    END IF;END;$BODY$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION taxon_history_update() RETURNS trigger AS $BODY$BEGIN
    IF TG_OP = 'UPDATE' THEN
        INSERT INTO history.taxon(operacao, data, tecnico, original_oid, taxon)
        VALUES ('UPDATE', current_timestamp, current_user, old.oid, old.taxon);
        RETURN old;
    END IF;END;$BODY$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION taxon_history_insert() RETURNS trigger AS $BODY$BEGIN
    IF TG_OP = 'INSERT' THEN
        INSERT INTO history.taxon(operacao, data, tecnico, original_oid, taxon)
        VALUES ('INSERT', current_timestamp, current_user, new.oid, new.taxon);
        RETURN new;
    END IF;END;$BODY$
LANGUAGE plpgsql;
create TRIGGER taxon_history_delete
Before DELETE ON taxonFOR EACH ROW EXECUTE PROCEDURE taxon_history_delete();
create TRIGGER taxon_history_update
Before UPDATE ON taxonFOR EACH ROW EXECUTE PROCEDURE taxon_history_update();
create TRIGGER taxon_history_insert
AFTER INSERT ON taxonFOR EACH ROW EXECUTE PROCEDURE taxon_history_insert();


ALT SHN <[email protected]> escreveu no dia sábado, 22/06/2019 à(s)
11:33:

> I am trying to create a trigger (Postgres 9.6) to track changes made to a
> table. This is my approach:
>
>     CREATE OR REPLACE FUNCTION taxon_history() RETURNS trigger AS
>     $BODY$
>     BEGIN
>     IF TG_OP = 'DELETE' THEN
>     INSERT INTO history.taxon(operacao, "data", tecnico, original_oid,
> taxon)
>     VALUES ('DELETE', current_timestamp, current_user, old.oid, old.taxon);
>     RETURN old;
>
>     ELSIF TG_OP = 'UPDATE' THEN
>     INSERT INTO history.taxon(operacao, "data", tecnico, original_oid,
> taxon)
>     VALUES ('DELETE', current_timestamp, current_user, old.oid, old.taxon);
>     RETURN old;
>
>     ELSIF TG_OP = 'INSERT' THEN
>     INSERT INTO history.taxon(operacao, "data", tecnico, original_oid,
> taxon)
>     VALUES ('INSERT', current_timestamp, current_user, new.oid, new.taxon);
>     RETURN old;
>     END IF;
>     END;
>     $BODY$
>     LANGUAGE plpgsql;
>
>     CREATE TRIGGER history_taxon
>     AFTER INSERT OR UPDATE OR DELETE ON taxon
>     FOR EACH ROW EXECUTE PROCEDURE taxon_history();
>
> However when something changes in the `taxon` table, no record is added to
> the `taxon_history` table. I also don´t get any error message so I am in
> the dark on why nothing is happening. What am I doing wrong?
>
> --
> ---------------------------------------------------------------
>
>
> *Sociedade de História Natural*
> Departamento de Informação Geográfica
> Polígono Industrial do Alto do Amial
> Pav.H02 e H06
> PORTUGAL
>
> [email protected] <[email protected]>
> www.shn.pt
> www.alt-shn.blogspot.com
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>
>

-- 
---------------------------------------------------------------


*Sociedade de História Natural*
Departamento de Informação Geográfica
Polígono Industrial do Alto do Amial
Pav.H02 e H06

[email protected] <[email protected]>
www.shn.pt
www.alt-shn.blogspot.com
Facebook <https://www.facebook.com/SociedadeDeHistoriaNatural?ref=hl>

TLM: 964138188