Mega Code Archive
CREATE TRIGGER FOR DELETE
<![CDATA[
2>
3> CREATE TABLE Customers (
4> CustomerID nchar (5) NOT NULL ,
5> CompanyName nvarchar (40) NOT NULL ,
6> ContactName nvarchar (30) NULL ,
7> ContactTitle nvarchar (30) NULL ,
8> Address nvarchar (60) NULL ,
9> City nvarchar (15) NULL ,
10> Region nvarchar (15) NULL ,
11> PostalCode nvarchar (10) NULL ,
12> Country nvarchar (15) NULL ,
13> Phone nvarchar (24) NULL ,
14> Fax nvarchar (24) NULL
15> )
16> 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 TABLE Orders (
3> OrderID int IDENTITY (1, 1) NOT NULL ,
4> CustomerID nchar (5) NULL ,
5> EmployeeID int NULL ,
6> OrderDate datetime NULL ,
7> RequiredDate datetime NULL ,
8> ShippedDate datetime NULL ,
9> ShipVia int NULL ,
10> Freight money NULL DEFAULT (0),
11> ShipName nvarchar (40) NULL ,
12> ShipAddress nvarchar (60) NULL ,
13> ShipCity nvarchar (15) NULL ,
14> ShipRegion nvarchar (15) NULL ,
15> ShipPostalCode nvarchar (10) NULL ,
16> ShipCountry nvarchar (15) NULL
17> )
18> GO
1>
2> CREATE TRIGGER CustomerHasOrders
3> ON Customers
4> FOR DELETE
5> AS
6> IF EXISTS
7> (
8> SELECT 'True'
9> FROM Deleted d
10> JOIN Orders o
11> ON d.CustomerID = o.CustomerID
12> )
13>
14> BEGIN
15> RAISERROR('Customer has Order History. Delete failed!', 16,1)
16> ROLLBACK TRAN
17> END
18> GO
1> DELETE Customers
2> WHERE CustomerID = 'WHITC'
3> GO
(0 rows affected)
1>
2>
3> drop TRIGGER CustomerHasOrders;
4> GO
1>
2> drop table Customers;
3> GO
1> drop table orders;
2> GO
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