generate barcode in vb.net Exercise 3: Implementing a Transact-SQL UDT in C#

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Exercise 3: Implementing a Transact-SQL UDT
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In this exercise, you create a Transact-SQL UDT for the City column in the CustomerAddress table so that any other tables in the database that store a city will have a con sistent definition. 1. Launch SSMS, connect to your instance, and open a new query window. 2. Drop the CustomerAddress table created previously, as follows:
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Lesson 1: Designing Database Tables
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DROP TABLE dbo.CustomerToCustomerAddress
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DROP TABLE dbo.CustomerAddress;
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3. Create the city data type using the following code:
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CREATE TYPE udt_city
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FROM varchar(50) NOT NULL ;
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4. Re-create the CustomerAddress table with the new UDT along with the CustomerToCustomerAddress table using the following code:
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CREATE TABLE dbo.CustomerAddress
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(CustomerAddressID int IDENTITY(1,1) PRIMARY KEY CLUSTERED,
AddressTypeID tinyint NOT NULL FOREIGN KEY (AddressTypeID) REFERENCES
dbo.AddressType(AddressTypeID),
PrimaryAddressFlag bit NOT NULL,
AddressLine1 varchar(30) NOT NULL,
AddressLine2 varchar(30) NULL,
AddressLine3 varchar(30) NULL,
City udt_city NOT NULL,
StateProvinceID int NULL FOREIGN KEY (StateProvinceID) REFERENCES
dbo.StateProvince(StateProvinceID),
PostalCode char(10) NULL,
CountryID int NULL FOREIGN KEY (CountryID) REFERENCES
dbo.Country(CountryID));
CREATE TABLE dbo.CustomerToCustomerAddress
(CustomerID int NOT NULL FOREIGN KEY (CustomerID) REFERENCES
dbo.Customer(CustomerID),
CustomerAddressID int NOT NULL FOREIGN KEY (CustomerAddressID) REFERENCES
dbo.CustomerAddress(CustomerAddressID),
CONSTRAINT PK_CustomerToCustomerAddress PRIMARY KEY CLUSTERED(CustomerID,
CustomerAddressID));
Lesson Summary
Tables are the building blocks for every database and are used to store all the data in SQL Server. To provide the necessary structure to a table, choices must be made between the available numeric, text, datetime, and binary data types so that data can be properly stored. After a table is defined, you must grant permis sions on the table in order to allow users to retrieve and manipulate data. Constraints are used to enforce additional business rules within a table. They can be used to ensure that duplicate values cannot be entered into a column, or that a column can only allow values that meet a specified condition. Constraints can be used to enforce complex pattern matching, like the vehicle identification number (VIN) that is used to uniquely identify every vehicle. Constraints can also be created to ensure that a value cannot be entered in one table unless it
12
Designing the Physical Database
already exists in another table, for example, not allowing an address to be entered unless a customer already exists for the address.
Primary keys should be implemented on all tables while also minimizing the number of columns in the primary key. Primary keys should be implemented as internal database structures that do not have any business meaning. For example, a Social Security number uniquely identifies an individual within the United States and might seem like a logical value for the primary key on an employee table. However, it is not mandatory for U.S. citizens to have a Social Security number, and anyone who is not a U.S. citizen does not have one, either. Additionally, Social Security numbers can change, although it is rare, which would cause cascading updates to occur for anything that was linked to the primary key. UDTs provide a means to enforce consistency in data type definitions across multiple tables. One of the most exciting new capabilities is to be able to define data types that are not native to SQL Server, such as latitudes and longitudes or geometric coordinates. However, please do not call us to fix your performance issues if you decide to create something like the customer or order data type.
Lesson Review
You can use the following questions to test your knowledge of the information in Les son 1, Designing Database Tables. The questions are also available on the compan ion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
What are the requirements to create a CLR-based UDT (Choose all that apply.) A. The CLR must be enabled for the database. B. The CLR must be enabled for the instance. C. A class created with a Microsoft .NET language. D. A class created with a CLR-compatible language.
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