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The aim of this page is to demonstrate that you can use a DataReader to provide values for any objects you create, so you start by defining a new object, Manufacturer, to use. This is created in the App_Code special folder, as it s not specific to a particular page. If you look at the DataSet code you ll use later in this chapter or the MySQL 5.0 and Microsoft Access versions of this page, you ll see that they use the same Manufacturer object. The Manufacturer object has properties cunningly mirroring the information stored in the Manufacturer table. public class Manufacturer { public string Name; public string Country; public string Email; public string Website; public Manufacturer() { }

Try con.Open() cmd.ExecuteNonQuery() Finally con.Close() End Try End Sub Public Sub AddItem(ByVal title As String, ByVal description As String, _ ByVal price As Decimal, ByVal categoryID As Integer) Dim con As New SqlConnection(connectionString) ' Create the Command. Dim insertSQL As String = "INSERT INTO Items " insertSQL &= "(Title, Description, Price, Category_ID)" insertSQL &= "VALUES (@Title, @Description, @Price, @CategoryID)" Dim cmd As New SqlCommand(insertSQL, con) cmd.Parameters.AddWithValue("@Title", title) cmd.Parameters.AddWithValue("@Description", description) cmd.Parameters.AddWithValue("@Price", price) cmd.Parameters.AddWithValue("@CategoryID", categoryID) Try con.Open() cmd.ExecuteNonQuery() Finally con.Close() End Try End Sub Private Function FillDataSet(ByVal cmd As SqlCommand, ByVal tableName As String) _ As DataSet Dim con As New SqlConnection(connectionString) cmd.Connection = con Dim adapter As New SqlDataAdapter(cmd) Dim ds As New DataSet() Try con.Open() adapter.Fill(ds, tableName) Finally con.Close() End Try

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SearchCatalog is a bit more complex. First of all, let s analyze its parameters: @DescriptionLength is the maximum length of the product description. @PageNumber specifies the page of results the visitor has requested. @ProductsPerPage specifies how many records to return. If @PageNumber is 3 and @ProductPerPage is 5, the procedure will return the 11th to 15th records from the search results. @HowManyResults is an output parameter, which you ll set to the total number of search results. This will be read from the C# code to calculate the number of search results pages. @AllWords is a bit input parameter that specifies whether you should do an all-words or any-words search. @Word1 to @Word5 are the words to be searched for. They all have a default value of NULL. The stored procedure starts by creating the @Products table variable: /* Create the table variable that will contain the search results */ DECLARE @Products TABLE (RowNumber SMALLINT IDENTITY (1,1) NOT NULL, ProductID INT, Name VARCHAR(50), Description VARCHAR(1000), Price MONEY, Image1FileName VARCHAR(50), Image2FileName VARCHAR(50), Rank INT) The RowNumber field is used for paging, as you learned in 4. This time it s also an IDENTITY column, to make its calculation a bit easier later on. We also have a field called Rank that contains the search result ranking (products with higher values are listed first). After creating the table variable, you populate it by searching the product catalog. For this, the stored procedure reads the @AllWords bit parameter and decides what kind of search to do depending on its value (an all-words search versus an any-words search). The logic of searching the catalog was explained earlier in this chapter.

This code automatically retrieves the connection string from the web.config file when the class is created, as described in 5. This trick enhances encapsulation, but if the client web application doesn t have the appropriate setting, the component doesn t work. The code includes methods for retrieving data (those methods that start with Get) and methods for updating data (those methods that start with Set). This class includes an overloaded method named GetItems(). This means the client can call GetItems() with no parameters to return the full list or with a parameter indicating the appropriate category. ( 3 provides an introduction to overloaded methods.) Each method that accesses the database opens and closes the connection. This is a far better approach than trying to hold a connection open over the lifetime of the class, which is sure to result in performance degradation in multiuser scenarios.

Your web server can open and close connections frequently without causing any slowdown. That s Tip because ADO.NET uses connection pooling to keep a small set of open connections ready to use. As long as you don t change the connection string, every time you call SqlConnection.Open() you receive one of these already-open connections, thereby avoiding the overhead of setting up a new connection.

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