如果我在CANInes表上有一个更新前触发器,它将timestamp列设置为Now(),并且DOGS继承自CANInes,当更新DOGS行时,是否应该触发CANInes更新触发器?在我的测试中没有,所以我怀疑答案是否定的,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",Sheltie/Shetland Sheepdog
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.