Oracle触发器增量提取

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--insert触发器提取增量
--delete触发器提取增量
--update触发器提取增量


----先建立两个增量表:一个插入表,一个删除表.
create table emp_insert_incremental(
empno number(4),
ename varchar(10)
)

create table emp_delete_incremental(
empno number(4),
ename varchar(10)
)
----------------
create or replace trigger emp_insert_trigger
after insert
on emp
for each row

begin
 insert into emp_insert_incremental(empno,ename) values (:new.empno,:new.ename); 
end emp_insert_trigger;

---------------
insert into emp(empno,ename)values(100,'jjj');
insert into emp(empno,ename)values(200,'ppp');
insert into emp(empno,ename)values(300,'3as');
---------------

create or replace trigger emp_update_trigger
after update
on emp
for each row
begin
 insert into emp_insert_incremental(empno,ename) values (:new.empno,:new.ename); 
 insert into emp_delete_incremental(empno,ename) values (:old.empno,:old.ename); 
end emp_update_trigger;

----------------
update emp set ename='aaa' where empno=100;

---------------

create or replace trigger emp_delete_trigger
after delete
on emp
for each row
begin
insert into emp_delete_incremental(empno,ename) values (:old.empno,:old.ename); 
end emp_delete_trigger;

----------------------
delete from emp_delete_incremental where empno=200;



--=================================三个触发器合为一个触发器提取增量
create or replace trigger emp_incremental_trigger
after insert or update of empno,ename or delete
on emp
for each row
begin
 case
 when inserting then
  insert into emp_insert_incremental(empno,ename) values (:new.empno,:new.ename); 
 when updating then
  insert into emp_insert_incremental(empno,ename) values (:new.empno,:new.ename); 
  insert into emp_delete_incremental(empno,ename) values (:old.empno,:old.ename); 
 when deleting then
  insert into emp_delete_incremental(empno,ename) values (:old.empno,:old.ename); 
 end case;
end emp_incremental_trigger;