SQL Server/T-SQL/Trigger/Trigger for update
Версия от 13:46, 26 мая 2010; (обсуждение)
Содержание
Call RAISERROR in a trigger
4>
5>
6>
7> CREATE TABLE Customers (
8> CustomerID nchar (5) NOT NULL ,
9> CompanyName nvarchar (40) NOT NULL ,
10> ContactName nvarchar (30) NULL ,
11> ContactTitle nvarchar (30) NULL ,
12> Address nvarchar (60) NULL ,
13> City nvarchar (15) NULL ,
14> Region nvarchar (15) NULL ,
15> PostalCode nvarchar (10) NULL ,
16> Country nvarchar (15) NULL ,
17> Phone nvarchar (24) NULL ,
18> Fax nvarchar (24) NULL
19> )
20> GO
1>
2> INSERT Customers VALUES("1","A","Maria", "Sales", "Str. 57", "Berlin" ,NULL,"12209", "Germany","111-1111111","111-1111111")
3> INSERT Customers VALUES("2","M","Joe", "Owner", "Ave. 231","Vancouver" ,NULL,"05023", "Mexico", "(222) 222-3332",NULL)
4> INSERT Customers VALUES("3","H","Thomas", "Sales", "Sq. 111","London" ,NULL,"1D00P", "UK", "(444) 444-4444","(444) 444-4444")
5> INSERT Customers VALUES("4","B","Berg", "Order", "Blv 8","Toronto" ,NULL,"00222", "Sweden", "4444-55 55 65","5555-55 55 55")
6> INSERT Customers VALUES("5","S","Moos", "Sales", "Fort 57","New York" ,NULL,"68306", "Germany","6666-66666","6666-77777")
7> INSERT Customers VALUES("6","F","Cite", "Manager","24 ","Dalles" ,NULL,"67000", "France", "88.60.15.31","88.60.15.32")
8> INSERT Customers VALUES("7","C","Sommer", "Owner", "Araq, 67","Paris" ,NULL,"28023", "Spain", "(91) 555 22 82","(91) 555 91 99")
9> INSERT Customers VALUES("8","P","Leb", "Owner", "12 ","Beijing" ,NULL,"13008", "France", "91.24.45.40","91.24.45.41")
10> INSERT Customers VALUES("9","D","Elizabeth","Manager","23 Blvd.","Tsawassen","BC", "T2F8M4","Canada", "(604) 555-4729","(604) 555-3745")
11> go
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2> CREATE VIEW CustomerOrders_vw
3> WITH SCHEMABINDING
4> AS
5> SELECT cu.rupanyName
6> FROM dbo.Customers AS cu
7> GO
1>
2>
3>
4> CREATE TRIGGER trCustomerOrderUpdate ON CustomerOrders_vw
5> INSTEAD OF UPDATE
6> AS
7> BEGIN
8> IF (SELECT COUNT(*) FROM Inserted) > 0
9> BEGIN
10> RAISERROR("No matching Orders. Cannot perform insert",10,1)
11> END
12> END
13> GO
1> drop TRIGGER trCustomerOrderUpdate;
2> drop view CustomerOrders_vw;
3> drop table Customers;
4> GO
Define trigger for Insert and Update
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 TRIGGER myTrigger
3> ON Employee
4> FOR INSERT, UPDATE
5> AS
6> IF EXISTS
7> (
8> SELECT "True"
9> FROM Inserted i
10> JOIN employee e
11> ON i.ID = e.ID
12> )
13> BEGIN
14> RAISERROR("Transaction Failed.",16,1)
15> ROLLBACK TRAN
16> END
17> GO
1>
2>
3> INSERT Employee (ID) VALUES (1)
4>
5>
6> drop table employee
7> GO
Msg 50000, Level 16, State 1, Server sqle\SQLEXPRESS, Procedure myTrigger, Line 14
Transaction Failed.
Msg 3609, Level 16, State 1, Server sqle\SQLEXPRESS, Line 3
The transaction ended in the trigger. The batch has been aborted.
1>
Trigger for FOR INSERT, UPDATE
2>
3> CREATE TABLE Products (
4> ProductID int IDENTITY (1, 1) NOT NULL ,
5> ProductName nvarchar (40) NOT NULL ,
6> SupplierID int NULL ,
7> CategoryID int NULL ,
8> QuantityPerUnit nvarchar (20) NULL ,
9> UnitPrice money NULL,
10> UnitsInStock smallint NULL,
11> UnitsOnOrder smallint NULL,
12> ReorderLevel smallint NULL,
13> Discontinued bit NOT NULL
14> )
15> GO
1>
2> CREATE TABLE OrderDetails (
3> OrderID int NOT NULL ,
4> ProductID int NOT NULL ,
5> UnitPrice money NOT NULL DEFAULT (0),
6> Quantity smallint NOT NULL DEFAULT (1),
7> Discount real NOT NULL DEFAULT (0)
8> )
9> GO
1>
2> CREATE TRIGGER OrderDetailIsProduct
3> ON OrderDetails
4> FOR INSERT, UPDATE
5> AS
6> IF EXISTS
7> (
8> SELECT "True"
9> FROM Inserted i
10> LEFT JOIN Products p
11> ON i.ProductID = p.ProductID
12> WHERE p.ProductID IS NULL
13> )
14> BEGIN
15> RAISERROR("Order Item Must Be a Valid Product" ,16,1)
16> ROLLBACK TRAN
17> END
18> GO
1> drop TRIGGER OrderDetailIsProduct;
2> GO
1> drop table OrderDetails;
2> GO
1> drop table Products;
2> GO
Trigger for update statement
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 TRIGGER myTrigger
3> ON Employee
4> FOR UPDATE
5> AS
6> IF EXISTS
7> (
8> SELECT "True"
9> FROM Inserted i
10> JOIN Deleted d
11> ON i.ID = d.ID
12> WHERE d.salary - i.salary > 0 )
13> BEGIN
14> RAISERROR("Salary wrong.",16,1)
15> ROLLBACK TRAN
16> END
17> GO
1>
2> update employee set salary = 0
3> GO
Msg 50000, Level 16, State 1, Server sqle\SQLEXPRESS, Procedure myTrigger, Line 14
Salary wrong.
Msg 3609, Level 16, State 1, Server sqle\SQLEXPRESS, Line 2
The transaction ended in the trigger. The batch has been aborted.
1>
2> drop table employee
3> GO
1>