如果在CANINES表上有一个before update触发器,它将timestamp列设置为now(),并且DOGS继承自CANINES,那么当DOGS行被更新时,CANINES update触发器是否应该触发?在我的测试中没有,所以我怀疑答案是否定的,但也许我做得不对:

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

最佳答案

长话短说-不,不是遗传的。可以选择CREATE TABLE-LIKE ... INCLUDING ...,但它也不传播触发器。

关于postgresql - PostgreSQL继承:父表触发器是否被继承?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/14787887/

10-12 00:20