registros - trigger postgresql auditoria

Error de Trigger de PostgreSQL

Question

Yo tengo:

CREATE OR REPLACE FUNCTION aktualizujIloscPodan() RETURNS TRIGGER AS
$BODY$
DECLARE
n integer;
sid integer;
BEGIN
sid=0;
IF (TG_OP=''INSERT'') THEN
sid = NEW."studentID";
ELSIF (TG_OP=''DELETE'') THEN
sid = OLD."studentID";
END IF;
n = COALESCE ((SELECT count("studentID") as c
FROM "Podania" WHERE "studentID"=sid
GROUP BY "studentID"), 0);
UPDATE "Studenci" SET "licznikpodan" = n WHERE "ID"=sid;
END;
$BODY$
LANGUAGE plpgsql;
DROP TRIGGER IF EXISTS triggenPodan ON "Podania";
CREATE TRIGGER triggenPodan AFTER INSERT OR DELETE
ON "Podania"
EXECUTE PROCEDURE aktualizujIloscPodan();

Cuando intento ejecutar:

DELETE FROM "Podania"
I get
ERROR: record "old" is not assigned yet
DETAIL: The tuple structure of a not-yet-assigned record is indeterminate.
CONTEXT: PL/pgSQL function "aktualizujiloscpodan" line 11 at assignment
********** Błąd **********
ERROR: record "old" is not assigned yet
Stan SQL:55000
Szczegóły:The tuple structure of a not-yet-assigned record is indeterminate.
Kontekst:PL/pgSQL function "aktualizujiloscpodan" line 11 at assignment

Parece que no sabe qué es OLD o NEW . ¿Cómo puedo arreglar eso?

Answer 1

Debe usar FOR EACH ROW

CREATE TRIGGER triggerPodan AFTER INSERT OR DELETE
ON "Podania" FOR EACH ROW
EXECUTE PROCEDURE aktualizujIloscPodan();

Answer 2

Para el activador de delete solo se define el registro OLD y NEW está definido NEW . Por lo tanto, en el código, verifique si el desencadenador se está ejecutando como DELETE o INSERT (variable TG_OP ) y acceda al registro apropiado.

Además, puedes ir sin contar aquí, así:

CREATE OR REPLACE FUNCTION aktualizujIloscPodan() RETURNS TRIGGER AS
$BODY$
DECLARE
n integer;
BEGIN
IF TG_OP = ''INSERT'' then
UPDATE "Studenci" SET "ilosc_podan" = "ilosc_podan" + 1 WHERE "ID"=NEW."studentID";
ELSIF TG_OP = ''DELETE'' then
UPDATE "Studenci" SET "ilosc_podan" = "ilosc_podan" - 1 WHERE "ID"=OLD."studentID";
END IF;
END;
$BODY$
LANGUAGE plpgsql;
DROP TRIGGER IF EXISTS triggenPodan ON "Podania";
CREATE TRIGGER triggenPodan AFTER INSERT OR DELETE
ON "Podania"
EXECUTE PROCEDURE aktualizujIloscPodan();