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SQL> -- create demo table
SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL,
3 First_Name VARCHAR2(10 BYTE),
4 Last_Name VARCHAR2(10 BYTE),
5 Start_Date DATE,
6 End_Date DATE,
7 Salary Number(8,2),
8 City VARCHAR2(10 BYTE),
9 Description VARCHAR2(15 BYTE)
10 )
11 /
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ('01','Jason', 'Martin', to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto', 'Programmer')
3 /
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values('02','Alison', 'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester')
3 /
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values('03','James', 'Smith', to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester')
3 /
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values('04','Celia', 'Rice', to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager')
3 /
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values('05','Robert', 'Black', to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester')
3 /
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values('06','Linda', 'Green', to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York', 'Tester')
3 /
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values('07','David', 'Larry', to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York', 'Manager')
3 /
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values('08','James', 'Cat', to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')
3 /
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer
02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester
03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester
04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager
05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester
06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester
07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester
SQL>
SQL>
SQL>
SQL> create table employees_copy as select * from employee;
SQL>
SQL> create table employees_log(
2 who varchar2(30),
3 action varchar2(100),
4 when date );
SQL>
SQL>
SQL> create or replace trigger biud_employees_copy
2 before insert or update or delete
3 on employees_copy
4 begin
5 state_package.rows_changed := 0;
6 end;
7 /
SQL>
SQL> create trigger biudfer_employees_copy
2 before insert or update or delete
3 on employees_copy
4 for each row
5 declare
6 l_action employees_log.action%type;
7 begin
8 if INSERTING then
9 l_action := 'Insert';
10 elsif UPDATING then
11 l_action := 'Update';
12 elsif DELETING then
13 l_action := 'Delete';
14 else
15 raise_application_error( -20001,
16 'You should never ever get this error.' );
17 end if;
18
19 state_package.rows_changed := state_package.rows_changed + 1;
20
21 if UPDATING( 'SALARY' ) then
22 l_action := l_action || ' - ' ||
23 'Salary for id ' || :old.id ||
24 ' changed from ' || :old.salary ||
25 ' to ' || :new.salary;
26 end if;
27
28 insert into employees_log(
29 who, action, when )
30 values(
31 user, l_action, sysdate );
32 end;
33 /
SQL>
SQL> create trigger aiud_employees_copy
2 after insert or update or delete
3 on employees_copy
4 declare
5 l_action employees_log.action%type;
6 begin
7 if INSERTING then
8 l_action := state_package.rows_changed || ' were ' || 'inserted';
9 elsif UPDATING then
10 l_action := state_package.rows_changed || ' were ' || 'updated';
11 elsif DELETING then
12 l_action := state_package.rows_changed || ' were ' || 'deleted';
13 else
14 raise_application_error( -20001,
15 'You should never ever get this error.' );
16 end if;
17
18 insert into employees_log(
19 who, action, when )
20 values(
21 user, l_action, sysdate );
22 end;
23 /
SQL>
SQL> update employees_copy set salary = salary * 0.95;
SQL>
SQL>
SQL> select * from employees_log;
WHO ACTION WHEN
------------------------------ ---------------------------------------------------------------------------------------------------- ---------
JAVA2S Update - Salary for id 01 changed from 1234.56 to 1172.83 09-SEP-06
JAVA2S Update - Salary for id 02 changed from 6661.78 to 6328.69 09-SEP-06
JAVA2S Update - Salary for id 03 changed from 6544.78 to 6217.54 09-SEP-06
JAVA2S Update - Salary for id 04 changed from 2344.78 to 2227.54 09-SEP-06
JAVA2S Update - Salary for id 05 changed from 2334.78 to 2218.04 09-SEP-06
JAVA2S Update - Salary for id 06 changed from 4322.78 to 4106.64 09-SEP-06
JAVA2S Update - Salary for id 07 changed from 7897.78 to 7502.89 09-SEP-06
JAVA2S Update - Salary for id 08 changed from 1232.78 to 1171.14 09-SEP-06
JAVA2S 8 were updated 09-SEP-06
SQL>
SQL>
SQL> drop table employees_copy;
SQL>
SQL> drop table employees_log;
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
SQL>
SQL>
SQL>
SQL>
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