我有：
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();
当我尝试执行：
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
好像不知道什么是OLD或NEW.我该如何解决？
您需要使用FOR EACH ROW
CREATE TRIGGER triggerPodan AFTER INSERT OR DELETE ON "Podania" FOR EACH ROW EXECUTE PROCEDURE aktualizujIloscPodan();
