Question

如果在工作室表中找到该人并且新工资<25000，我需要创建一个触发器以防止更新人员表中的工资。那些是我的桌子：

CREATE TABLE persons
(id_person NUMBER (15),
name VARCHAR2 (20),
address VARCHAR2 (20),
sex CHAR (1),
birthdate DATE,
salary NUMBER (10));

CREATE TABLE studio
(name VARCHAR2 (20),
address VARCHAR2 (20),
id_president NUMBER (15));

这是触发器，但不起作用：

create or replace trigger president_salary  
before update on person  
begin  
if (new.id_person in ( select id_person from person join studio on (id_person=id.president) where id_person=new.id_person) AND new.salary<25000) then
dbms_outupt.putline('value to small');
end if;
end;

Answer 1

尝试更像

的触发器

create or replace trigger president_salary  
before update on person  
begin  
    if (:new.id_person in ( select id_person from person join studio on (id_person=id.president) where id_person=:new.id_person) AND :new.salary<25000) then
    dbms_outupt.putline('value to small');
    RAISE NO_DATA_FOUND; --or some other exception
end if;
end;

请注意正确使用:new和RAISE语句以导致更新失败

plsql触发更新值

1 个答案: