我创建了这个触发器:
CREATE TRIGGER trig_update
AFTER INSERT
ON "delivery" FOR EACH ROW
EXECUTE PROCEDURE premium1();
使用此功能:
CREATE OR REPLACE FUNCTION premium1()
RETURNS trigger AS $$
BEGIN
IF (TG_OP='INSERT') THEN
IF(select sum(amount) from delivery where cli_num=OLD.cli_num group by cli_num) > 500.00 THEN
UPDATE client SET Type ='Gold' WHERE cli_num=OLD.cli_num;
END IF;
END IF;
RETURN NULL;
END;
$$LANGUAGE plpgsql;
在表格传递中插入新值时,我收到以下错误:
错误:记录"旧"尚未分配Stan SQL:55000
对此有何帮助?
答案 0 :(得分:2)
在AFTER
触发器中OLD
无法访问/可见,因为该记录尚未存在于数据库中,因此无法将其与之进行比较。您必须将其更改为NEW
。
对于行级触发器,输入数据还包括NEW行 INSERT和UPDATE触发器,和/或UPDATE和DELETE的OLD行 触发器。
答案 1 :(得分:1)
CREATE OR REPLACE FUNCTION premium1()
RETURNS trigger AS $$
BEGIN
IF (TG_OP='INSERT') THEN
IF(select sum(amount) from delivery where cli_num=NEW.cli_num group by cli_num) > 500.00 THEN
UPDATE client SET Type ='Gold' WHERE cli_num=NEW.cli_num;
END IF;
END IF;
RETURN NULL;
END;
$$LANGUAGE plpgsql;