SQL Server/T-SQL/Trigger/Trigger Value — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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(нет различий)
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Текущая версия на 10:20, 26 мая 2010
Get value from updated, inserted and deleted
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>
Learning to Reference Inserted and Deleted Tables
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> --Learning to Reference Inserted and Deleted Tables
3>
4> IF EXISTS(SELECT *
5> FROM sys.objects o JOIN sys.schemas s
6> ON o.schema_id = s.schema_id
7> WHERE type = "TR" AND
8> s.name = "dbo" AND
9> o.name = "myTrigger")
10> DROP TRIGGER myTrigger
11> GO
1>
2> CREATE TRIGGER myTrigger
3> ON Employee
4> FOR UPDATE, INSERT, DELETE
5> AS
6> SELECT * FROM inserted
7> SELECT * FROM deleted
8> GO
1>
2> SELECT "Before INSERT"
3>
4> INSERT Employee (ID, Name)
5> VALUES (31, "Rick")
6> GO
-------------
Before INSERT
(1 rows affected)
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
31 Rick NULL NULL NULL NULL
(1 rows affected)
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
(0 rows affected)
1>
2> SELECT "Before UPDATE"
3>
4> UPDATE Employee
5> SET Name = "Rickie"
6> WHERE ID = 3
7> GO
-------------
Before UPDATE
(1 rows affected)
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
3 Rickie 24020 1996-12-03 00:00:00.000 Toronto W
(1 rows affected)
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
3 Celia 24020 1996-12-03 00:00:00.000 Toronto W
(1 rows affected)
1> SELECT "Before DELETE"
2> GO
-------------
Before DELETE
(1 rows affected)
1> DELETE FROM Employee WHERE ID = 3
2> GO
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
(0 rows affected)
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
3 Rickie 24020 1996-12-03 00:00:00.000 Toronto W
(1 rows affected)
1> drop table employee
2> GO
1>