以下为MySQL 触发器insert 的3个示例演示（update类似）
delimiter //
create trigger InsertUser
before insert on user
for each row
Begin
insert into user_group(uid,gid) values(new.uid,\'group4444444444\');
end;//
delimiter ;
delimiter //
create trigger InsertUser
before insert on user
for each row
Begin
IF new.Type=2 then
insert into user_group(uid,gid) values(new.uid,\'group4444444444\');
else
insert into user_group(uid,gid) values(new.uid,\'group55555555555\')
END IF;
end;//
delimiter ;
delimiter //
create trigger InsertUser
before insert on user
for each row
Begin
IF new.type=1 then
insert into user_group(uid,gid) values(new.uid,\'578d3369633b47bd9c1fe8bf905cbfb1\');
END IF;
IF new.type=2 then
insert into user_group(uid,gid) values(new.uid,\'387bcd57fc5a4c3c9de83ee210fef661\');
END IF;
end;//
delimiter ;