PostgreSQL触发器错误

发布时间：2020-12-13 16:27:21 所属栏目：百科来源：网络整理

导读：我有： CREATE OR REPLACE FUNCTION aktualizujIloscPodan() RETURNS TRIGGER AS$BODY$ DECLARE n integer; sid integer;BEGINsid=0;IF (TG_OP='INSERT') THENsid = NEW."studentID";ELSIF (TG_OP='DELETE') THENsid = OLD."studentID";END IF;n = COALESCE

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

********** B??d **********

ERROR: record "old" is not assigned yet
Stan SQL:55000
Szczegó?y: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();

（编辑：李大同）

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