PostgreSQL 继承 : are parent-table triggers inherited?

Question

如果我在 CANINES 表上有一个将时间戳列设置为 now() 的更新前触发器，并且 DOGS 从 CANINES 继承，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，但也许我做的事情不正确:

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

Answer 1

长话短说 - 不，它不是遗传的。有 CREATE TABLE 选项 - LIKE ... INCLUDING ...，但它也不会传播触发器。