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When the application exits, for the sake of cleanup, add the following code just after the closing curly brace of the messages loop:

You then bind rules to columns or user-defined data types by using the sp_bindrule system stored procedure.

For more information about binding rules, refer to the Books Online article CREATE RULE (Trans act-SQL) at ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/tsqlref9/html/b016a289-3a74-46b1-befc a13183be51e4.htm.

A default enables SQL Server to write a value to a column when the user doesn t specify a value. Common uses for defaults are when there is either a typical value or common value, but it is not necessarily the only possible choice. For example, the company we have been creating tables for might be a retail store located in Grand Prairie, TX. Although the large majority of customers would have an address with a city of Grand Prairie, customers might still come into the store from nearby Arlington or Irving. For example, adding a default constraint to the city column in the CustomerAddress table looks like the following:

(CustomerAddressID int AddressType char(4) PrimaryAddressFlag bit AddressLine1 varchar(30) AddressLine2 varchar(30) AddressLine3 varchar(30) City varchar(50) StateProvinceID int PostalCode char(10) CountryID int IDENTITY(1,1),

NOT NULL,

NOT NULL,

NOT NULL,

CoUninitialize(); // Sleep for a second before dismissing the console window. Sleep(1000); FreeConsole();

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NULL,

NULL,

NOT NULL DEFAULT 'Grand Prairie',

NULL,

NULL,

NULL)

A unique constraint forces a column or combination of columns to not allow dupli cate values. An example of this type of business rule is that each customer name must be unique.

The last step is to initiate the Ribbon in the WM_CREATE message of the main window. Add the following code to the switch statement of the WndProc function:

12

A unique constraint applied to the CustomerName column in the customer table looks like the following:

(CustomerID int IDENTITY(1,1),

CustomerName varchar(50) NOT NULL UNIQUE NONCLUSTERED,

CreditLine smallmoney NULL,

OutstandingBalance smallmoney NULL,

AvailableCredit AS (CreditLine - OutstandingBalance),

bool initSuccess; switch (message) { case WM_CREATE: // Initializes the Ribbon framework. initSuccess = InitializeFramework(hWnd); if (!initSuccess) { return -1; } break;

CreationDate datetime NOT NULL)

17-4

Choosing a primary key constraint is the single most important decision you can make for the structure of a table. A primary key defines the column or combination of columns that enable a row to be uniquely identified. A primary key can be implemented on the StateProvince table as follows:

CREATE TABLE dbo.StateProvince (StateProvinceID int StateProvince varchar(50) IDENTITY(1,1) NOT NULL) PRIMARY KEY,

Every table should have a primary key. The primary key defines the column or col umns that enable you to uniquely identify a row within the table. A primary key should also be an internal structure within a database that does not carry any busi ness meaning. This enables a piece of data to be uniquely defined while also ensuring that the value does not have to be changed. Having the value of a primary key remain static is important to the implementation of foreign keys so that a change does not have to be propagated across multiple tables.

You use foreign key constraints to implement referential integrity. Foreign keys require the values that users can enter in a particular column to exist in another table. Values that do not exist in the specified table are not allowed to be entered into the column. For example, the CustomerAddress table should be allowed to specify only values for the StateProvince column that are valid. Providing a valid list of states and provinces for a user to select from, as well as enforcing the range of available values, ensures that data is not only consistent but also valid.

To enforce referential integrity on the StateProvince column in the CustomerAddress table, you can use the following code:

Of course, you have to add the Ribbon.xml file from the previous chapter as well as set the custom build to create the Ribbon resource and header file:

(CustomerAddressID int AddressType char(4) PrimaryAddressFlag bit AddressLine1 varchar(30) AddressLine2 varchar(30) AddressLine3 varchar(30) City varchar(50) StateProvinceID int PostalCode char(10) CountryID int IDENTITY(1,1),

NOT NULL,

NOT NULL,

NOT NULL,

NULL,

NULL,

NOT NULL DEFAULT 'Grand Prairie',

< xml version="1.0" encoding="utf-8" > <Application xmlns='http://schemas.microsoft.com/windows/2009/Ribbon'>

NULL REFERENCES dbo.StateProvince(StateProvinceID),

NULL,

NULL)

An alternative is the following:

(CustomerAddressID int AddressType char(4) PrimaryAddressFlag bit AddressLine1 varchar(30) AddressLine2 varchar(30) AddressLine3 varchar(30) City varchar(50) StateProvinceID int dbo.StateProvince(StateProvinceID),

PostalCode char(10) CountryID int IDENTITY(1,1),

NOT NULL,

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