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Note It is strongly recommended to consistently follow an efficient project-management methodology to maximize the chances of the project s success, on budget and on time. Most project-management theories imply that an initial requirements/specifications document containing the details of the project you re about to create has been signed by you and the client. You can use this document as a guide while creating the solution, and it also allows you to charge extra in case the client brings new requirements or requests changes after development has started. See Appendix B for more details.

The component doesn t have to limit the type of information it provides to DataSets. Other information is also useful. For example, you might provide a read-only property called ItemFields that returns an array of strings representing the names for fields in the Items table. Or you might add another method that retrieves aggregate information about the entire table, such as the average cost of an item or the total number of currently listed items, as shown here:

Public Class DBUtil ' (Other class code omitted.) Public Function GetAveragePrice() As Decimal Dim query As String = "SELECT AVG(Price) FROM Items" Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(query, con) con.Open() Dim average As Decimal = CType(cmd.ExecuteScalar(), Decimal) con.Close() Return average End Function Public Function GetTotalItems() As Integer Dim query As String = "SELECT COUNT(*) FROM Items"

Close() Read() GetXXX(int) GetOrdinal(string) IsDBNull(int) NextResult()

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Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(query, con) con.Open() Dim count As Integer = CType(cmd.ExecuteScalar(), Integer) con.Close() Return count End Function End Class

To ensure this project s success, you need to come up with a smart way to implement what you ve signed the contract for. You want to make your life easy and develop the project smoothly and quickly, but the ultimate goal is to make sure the client is satisfied with your work. Consequently, you should aim to provide your site s increasing number of visitors with a pleasant web experience by creating a nice, functional, and responsive web site by implementing each one of the three development phases described in the first chapter. The requirements are high, but this is normal for an e-commerce site today. To maximize the chances of success, we ll try to analyze and anticipate as many of the technical requirements as possible, and implement the solution in way that supports changes and additions with minimal effort. In this chapter, we ll lay down the foundations for the future BalloonShop web site. We ll talk about what technologies and tools you ll use, and even more important, how you ll use them. Let s consider a quick summary of the goals for this chapter before moving on: Analyze the project from a technical point of view. Analyze and choose an architecture for your application. Decide which technologies, programming languages, and tools to use.

These queries use some SQL that may be new to you (namely, the COUNT and AVG functions). However, these methods are just as easy to use from the client s perspective as GetItems() and GetCategories():

Closes the DataReader object Moves to the next row in the DataReader; returns true if a row exists, or false if at the end of the DataReader Returns and casts the contents of a column at index int in the row** Returns the column index for the specified column name Returns true if the column at index int contains a null value pulled from the database, or false otherwise Moves to the next table in the DataReader; returns true if the next table exists, or false otherwise

Dim DB As New DatabaseComponent.DBUtil() Dim averagePrice As Decimal = DB.GetAveragePrice() Dim totalItems As Integer = DB.GetTotalItems()

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