如果我在CANINES表上有一个更新前触发器,它将timestamp列设置为now(),而DOGS继承自CANINES,当更新DOGS行时,是否应该触发CANINES更新触发器?在我的测试中它没有,所以我怀疑答案是否,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
答案 0 :(得分:8)
长话短说 - 不,它不是遗传的。可以选择CREATE TABLE
- LIKE ... INCLUDING ...
,但它也不会传播触发器。