The document contains definitions for 8 triggers that are used to automatically populate primary key columns in tables with values from sequences and archive old records to history tables. The triggers are defined to run before insert operations on various tables like Customer, Order_Master, Product, etc. and populate the primary key column with the next value from a corresponding sequence, or insert old values into history tables.

1. /* web example
CREATE OR REPLACE TRIGGER TEST_SEQ_TRIGGER
BEFORE INSERT ON TESTUSER.EMPLOYEE
FOR EACH ROW
BEGIN
IF :new.SSN IS NULL THEN
SELECT TEST_SEQUENCE.nextval INTO :new.SSN FROM DUAL;
END IF;
END;
web example end
*/
create or replace trigger Work_Center_Insert_Tr
before insert on Work_Center
for each row
DECLARE
v_Work_Center_Id
Work_Center.Work_Center_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_Work_Center_Id
FROM dual;
:NEW.Work_Center_Id:=v_Work_Center_Id;
END;
CREATE OR REPLACE
TRIGGER NEW_EVALUATION_TRIGGER
BEFORE INSERT ON EVALUATIONS
FOR EACH ROW
BEGIN
:NEW.evaluation_id := evaluations_sequence.NEXTVAL;
END;

2. -- The title of the NEW_EVALUATION_TRIGGER pane is in italic
font, indicating that
--the trigger is not yet saved in the database.
--In the CREATE TRIGGER statement, replace NULL with this:
--:NEW.evaluation_id := evaluations_sequence.NEXTVAL
CREATE OR REPLACE TRIGGER TEST_SEQ_TRIGGER
BEFORE INSERT ON TESTUSER.EMPLOYEE
FOR EACH ROW
BEGIN IF :new.SSN IS NULL
THEN SELECT TEST_SEQUENCE.nextval
INTO :new.SSN
FROM DUAL;
END IF;
END;
describe customer;
-- Sample trigger
CREATE OR REPLACE TRIGGER employee_tr
BEFORE INSERT ON employee
FOR EACH ROW
DECLARE v_employee_id employee.employee_id%TYPE;
BEGIN
SELECT employee_ID_SEQ.NEXTVAL
INTO v_employee_id
FROM dual;

3. :NEW.employee_id:=v_employee_id;
END;
CREATE OR REPLACE TRIGGER dept_tr
BEFORE INSERT ON departments
FOR EACH ROW
WHEN (new.id IS NULL)
BEGIN
SELECT dept_seq.NEXTVAL
INTO :new.id
FROM dual;
END;
--/*Test it using the automatic and manual population methods.
/*SQL> INSERT INTO departments (description)
2 VALUES ('Development');
1 row created.
*/
SELECT * FROM departments;
ID DESCRIPTION
---------- --------------------------------------------------
1 Development
1 row selected.
SQL> INSERT INTO departments (id, description)
2 VALUES (dept_seq.NEXTVAL, 'Accounting');

4. 1 row created.
SQL> SELECT * FROM departments;
ID DESCRIPTION
---------- --------------------------------------------------
1 Development
2 Accounting
*/
--
=================================================================
===========================
-- Trigger 1
==
describe Customer;
insert into Customer
(
NAME
,streET_ADDRESS
,CITY
,STATE
,ZIP
,YTD_PURCHASES
,CREDIT_LIMIT
,OUTSTANDING_BALANCE
,DISCOUNT_PERCENT
,LAST_UPDATED_BY
,LAST_UPDATE_DATE
)
values
(
'Amy Cashier'
,'548 Main Street'
,'Louisville'
,'KY'
,'50404'
,123.45
,5000.00
,123.45
,10
,USER
,SYSDATE
);
CREATE OR REPLACE TRIGGER dept_bir
BEFORE INSERT ON departments
FOR EACH ROW
WHEN (new.id IS NULL)
BEGIN
SELECT dept_seq.NEXTVAL
INTO :new.id

5. FROM dual;
END;
--MODEL FOLLOWS
create or replace trigger Work_Center_Insert_Tr
before insert on Work_Center
for each row
DECLARE
v_Work_Center_Id Work_Center.Work_Center_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_Work_Center_Id
FROM dual;
:NEW.Work_Center_Id:=v_Work_Center_Id;
END;
--MODEL ABOVE
ALTER Customer
DISABLE ALL TRIGGERS;
DROP Customer_Insert_Tr;
create or replace trigger Customer_Insert_Tr
before insert on Customer
for each row
declare v_Customer_Id Customer.Customer_Id%type;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO :v_CUSTOMER_ID
FROM dual;
:new.Customer_id := v_customer_Id;

6. END;
-- Trigger 2
describe Order_Master;
drop trigger Order_Archive_Tr;
create or replace trigger Order_Master_Insert_Tr
before insert on Order_Master
for each row
--when (new.Order_Id is null);
DECLARE
v_Order_Id Order_Master.Order_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO :NEW.Order_Id
--v_Order_Id
FROM dual;
-- :NEW.Order_Id:=v_Order_Id;
END;
insert into order_Master
(Order_Date
,
Customer_Id
,
LAST_UPDATED_By
,
LAST_UPDATE_DATE
)
values
(

7. SYSDATE
,
55
,
'APPAS'
,SYSDATE
);
-- Trigger 3
select * from Product;
describe Product;
create or replace trigger Product_Insert_Tr
before insert on Product
for each row
DECLARE v_Product_Id Product.Product_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_Product_Id
FROM dual;
:NEW.Product_Id:=v_Product_Id;
END;
-- Trigger 4
SELECT * FROM wORK_cENTER;
describe Work_Center;
create or replace trigger Work_Center_Insert_Tr
before insert on Work_Center
for each row

8. DECLARE
v_Work_Center_Id Work_Center.Work_Center_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_Work_Center_Id
FROM dual;
:NEW.Work_Center_Id:=v_Work_Center_Id;
END;
insert into Work_Center
(name
,Capacity
,Last_updated_by
,
Last_Update_date
)
values
('Wausau, WI)'
,
250
,
USER
,
SYSDATE
);
-- Trigger 5
describe Customer;
describe Customer_History;
create or replace trigger Customer_Archive_Tr
before insert on Customer
for each row

9. DECLARE
v_Customer_History_Id Customer.Customer_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_Customer_History_Id
FROM dual;
insert into Customer_History
values
(v_Customer_History_Id
,
USER,
SYSDATE,
:old.Customer_Id,
:old.Name,
:old.Street_address
,
:old.City,
:old.State,
:old.Zip,
:old.Ytd_Purchases
,
:old.credit_limit
,
:old.OUTSTANDING_BALANCE
,
:old.Discount_Percent
,
:old.last_updated_by
,
:old.LAST_UPDATE_DATE
) ;
end;
-- Trigger 6
describe Order_Master;
describe Order_History;

10. create or replace trigger Order_Archive_Tr
before insert on Order_Master
for each row
DECLARE
v_Order_History_Id
Order_Master.Order_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_Order_History_Id
FROM dual;
insert into Order_History
values
(v_Order_History_Id
,
USER
,
SYSDATE
,
:old.Order_Id
,
:old.Order_Date
,
:old.Customer_Id
,
:old.Last_updated_by
,
:old.Last_Update_Date
) ;
end;
-- Trigger 7
describe Order_Detail;
describe Order_Dtl_History;
create or replace trigger Order_Dtl_Archive_Tr

11. before insert on Order_Detail
for each row
DECLARE
v_Order_Dtl_History_Id
Order_Detail.Order_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_Order_Dtl_History_Id
FROM dual;
insert into Order_Dtl_History
values
(v_Order_Dtl_History_Id
,
USER
,
SYSDATE
,
:old.Order_Id
,
:old.Product_Id
,
:old.Qty_Ordered
,
:old.Last_updated_by
,
:old.Last_Update_Date
) ;
end;
-- Trigger 8
describe Product ;
describe Product_History;

12. create or replace trigger Product_Archive_Tr
before insert ON Product
for each row
DECLARE
v_History_Id Product_History.History_Id%TYPE;
begin
SELECT Pvfc_Seq.NEXTVAL
INTO v_History_Id
FROM dual;
insert into Product_History
values
(v_History_Id
,
USER
,
SYSDATE
,
:old.Product_Id
,
:old.Product_Line_Cd
,
:old.Location_Cd
,
:old.Finish_Cd
,
:old.Description
,
:old.Unit_Price
,
:old.Qty_On_Hand
,
:old.Qty_Backordered
,
:old.Reorder_Point
,
:old.Reorder_Qty
,
:old.Scheduled_Receipts
,
:old.Last_Updated_By
,
:old.Last_Update_Date

13. );
end;