如果我在CANINES表上设置了一个before-update触发器,将一个时间戳列设置为now(),并且DOGS继承自CANINES,当更新DOGS行时,CANINES的update-trigger是否应该触发?根据我的测试结果,它没有触发,所以我认为答案是不。但也许我没有做正确的事情:
create table canines
(
lastupdate timestamp with time zone default now()
);
CREATE OR REPLACE FUNCTION stamp_lastupdate_column()
RETURNS TRIGGER AS $$
BEGIN
NEW.lastupdate = now();
RETURN NEW;
END;
$$ language 'plpgsql';
CREATE TRIGGER TRG_CANINES_BU BEFORE UPDATE
on CANINES FOR EACH ROW EXECUTE PROCEDURE
stamp_lastupdate_column();
create table dogs
(id int primary key,
breed varchar(25)
) inherits (CANINES);
insert into dogs(id, breed) values(1, 'sheltie');
select * from dogs;
--"2013-02-09 06:49:31.669-05" , 1 , sheltie
update dogs set breed = 'Sheltie/Shetland Sheepdog' where id = 1;
select * from dogs;
--"2013-02-09 06:49:31.669-05" , 1 , Sheltie/Shetland Sheepdog