SQLSERVER CREATE TRIGGER

1> create table employee(
2> ID int,
3> name nvarchar (10),
4> salary int,
5> start_date datetime,
6> city nvarchar (10),
7> region char (1))
8> GO
1>
2> insert into employee (ID, name, salary, start_date, city, region)
3> values (1, 'Jason', 40420, '02/01/94', 'New York', 'W')
4> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (2, 'Robert',14420, '01/02/95', 'Vancouver','N')
3> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (3, 'Celia', 24020, '12/03/96', 'Toronto', 'W')
3> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (4, 'Linda', 40620, '11/04/97', 'New York', 'N')
3> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (5, 'David', 80026, '10/05/98', 'Vancouver','W')
3> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (6, 'James', 70060, '09/06/99', 'Toronto', 'N')
3> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (7, 'Alison',90620, '08/07/00', 'New York', 'W')
3> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (8, 'Chris', 26020, '07/08/01', 'Vancouver','N')
3> GO

(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (9, 'Mary', 60020, '06/09/02', 'Toronto', 'W')
3> GO

(1 rows affected)
1>
2> select * from employee
3> GO
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
1 Jason 40420 1994-02-01 00:00:00.000 New York W
2 Robert 14420 1995-01-02 00:00:00.000 Vancouver N
3 Celia 24020 1996-12-03 00:00:00.000 Toronto W
4 Linda 40620 1997-11-04 00:00:00.000 New York N
5 David 80026 1998-10-05 00:00:00.000 Vancouver W
6 James 70060 1999-09-06 00:00:00.000 Toronto N
7 Alison 90620 2000-08-07 00:00:00.000 New York W
8 Chris 26020 2001-07-08 00:00:00.000 Vancouver N
9 Mary 60020 2002-06-09 00:00:00.000 Toronto W

(9 rows affected)
1>
2> CREATE TABLE myArchive (
3> AID int IDENTITY(1,1) PRIMARY KEY CLUSTERED,
4> type nvarchar(6) NOT NULL,
5> whenchanged smalldatetime NOT NULL DEFAULT Getdate(),
6> ID int,
7> newName nvarchar(30),
8> oldName nvarchar(50)
9> )
10> GO
1>
2>
3> CREATE TRIGGER myTriggerINSERT
4> ON Employee
5> FOR INSERT
6> AS
7> DECLARE @ID int, @Name nvarchar(30)
8>
9> SET @ID = (SELECT ID FROM inserted)
10> SET @Name = (SELECT Name FROM inserted)
11>
12> INSERT myArchive (type, ID, newName) VALUES('INSERT', @ID, @Name)
13> GO
1>
2>
3> CREATE TRIGGER myTriggerDELETE
4> ON Employee
5> FOR DELETE
6> AS
7> DECLARE @ID int, @Name nvarchar(30)
8>
9> SET @ID = (SELECT ID FROM deleted)
10> SET @Name = (SELECT Name FROM deleted)
11>
12> INSERT myArchive (type, ID, oldName ) VALUES('DELETE', @ID, @Name)
13> GO
1>
2> CREATE TRIGGER myTriggerUPDATE
3> ON Employee
4> INSTEAD OF UPDATE
5> AS
6>
7> DECLARE @ID int, @newName nvarchar(30), @oldName nvarchar(30)
8>
9> IF (SELECT ID FROM inserted) <> (SELECT ID FROM deleted)
10> RAISERROR ('You are not allowed to change ID.', 10,1)
11> ELSE
12> BEGIN
13>
14> --set local variables
15> SET @ID = (SELECT ID FROM inserted)
16> SET @newName = (SELECT Name FROM inserted)
17> SET @oldName = (SELECT Name FROM deleted)
18>
19> --write to table
20> UPDATE Employee SET Name = @newName WHERE ID = @ID
21> -- write to archive
22> INSERT myArchive (type, ID, newName, oldName) VALUES('UPDATE', @ID, @newName, @oldName)
23> END
24> GO
1>
2> INSERT Employee (id, name) VALUES (13, 'Rickie')
3> GO

(1 rows affected)
1>
2> SELECT * FROM myArchive
3> GO
AID type whenchanged ID newName oldName
----------- ------ -------------------- ----------- ------------------------------ ------------------
1 INSERT 2006-10-10 20:21:00 13 Rickie NULL

(1 rows affected)
1>
2> UPDATE Employee
3> SET Name = 'Rick'
4> WHERE ID = 3
5> GO

(1 rows affected)

(1 rows affected)
1>
2> SELECT * FROM myArchive
3> GO
AID type whenchanged ID newName oldName
----------- ------ -------------------- ----------- ------------------------------ ------------------
1 INSERT 2006-10-10 20:21:00 13 Rickie NULL
2 UPDATE 2006-10-10 20:21:00 3 Rick Celia

(2 rows affected)
1>
2>
3> drop table myArchive
4> drop table employee
5> GO
1>