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--´´½¨´¥·¢Æ÷£¨Ðм¶´¥·¢Æ÷£©
create or replace trigger tri_update_emp_bak
after update
on emp_bak
for each row --ÿ¸üÐÂÒ»ÐÐ ¾Í´¥·¢Ò»´Î
begin
--oracle ÀïÃæ ¶Ô´¥·¢Æ÷ Ò²ÌṩÁËÌØÊâµÄ¶ÔÏó :NEW :OLD À´·ÃÎÊ ¸üÐÂǰºóµÄÊý¾Ý

dbms_output.put_line('¸üкó' || :NEW.sal);
dbms_output.put_line('¸üÐÂǰ' || :OLD.sal);

if updating then

end if;

if inserting
end;
--´´½¨´¥·¢Æ÷£¨Ðм¶´¥·¢Æ÷£©£¨Ç°Öã©
create or replace trigger tri3_update_emp_bak
before update
on emp_bak
for each row --ÿ¸üÐÂÒ»ÐÐ ¾Í´¥·¢Ò»´Î
begin
--oracle ÀïÃæ ¶Ô´¥·¢Æ÷ Ò²ÌṩÁËÌØÊâµÄ¶ÔÏó :NEW :OLD À´·ÃÎÊ ¸üÐÂǰºóµÄÊý¾Ý

dbms_output.put_line('¸üкó' || :NEW.sal);
dbms_output.put_line('¸üÐÂǰ' || :OLD.sal);
end;
select * from emp_bak
update emp_bak set sal = 1000 where empno in (7788)
--´´½¨´¥·¢Æ÷£¨±í¼¶´¥·¢Æ÷£©
--//±í¼¶±ð´¥·¢Æ÷ÀïÃæ ²»ÔÊÐíʹÓà :NEW :OLD ±äÁ¿
create or replace trigger tri2_update_emp_bak
after update
on emp_bak
begin

-- dbms_output.put_line('¸üкó' || :NEW.sal);
--dbms_output.put_line('¸üÐÂǰ' || :OLD.sal);
end;
--´´½¨´¥·¢Æ÷£¨Ðм¶´¥·¢Æ÷£©
create or replace trigger tri4_update_emp_bak
after update of sal
on emp_bak
for each row --ÿ¸üÐÂÒ»ÐÐ ¾Í´¥·¢Ò»´Î
begin
--oracle ÀïÃæ ¶Ô´¥·¢Æ÷ Ò²ÌṩÁËÌØÊâµÄ¶ÔÏó :NEW :OLD À´·ÃÎÊ ¸üÐÂǰºóµÄÊý¾Ý

dbms_output.put_line('¸üкó' || :NEW.sal);
dbms_output.put_line('¸üÐÂǰ' || :OLD.sal);
end;
create table userinfo
(
userid number(4) primary key,
username varchar2(20)
)
create table addrinfo
(
addrid number(4) primary key,
addname varchar2(20),
userid number(4) references userinfo(userid)
)
insert into userinfo values (1,'ÀîËÄ')
insert into addrinfo values (1,'ºþ±±Î人',1)
select * from addrinfo
delete from userinfo where userid =1
--¼¶ÁªÉ¾³ý
create or replace trigger tri_userinfo_delete
before delete
on userinfo
for each row
begin
del


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