intVar = drdrDataReaderGetInt32(0); // or the slightly less efficient in VS .NET

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intVar = drdrDataReaderGetInt32(0); // or the slightly less efficient
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intVar = drdrDataReaderGetValue(0);
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// or
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intVar = drdrDataReaderItem["ProductID"];
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Similarly, the call to retrieve the ProductName field would be one of the following lines of code:
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strVar = drdrDataReaderGetString(1); // or
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strVar = drdrDataReaderGetValue(1); // or
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strVar = drdrDataReaderItem["ProductName"];
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You cannot create a DataReader object directly; you must use the SqlCeCommand object s ExecuteReader method to create the DataReader object When first created, the DataReader object is open but not yet positioned at a row You have two ways to position it to a row The first is to use the DataReader object s Read method to move sequentially through the rows The second is to use the DataReader object s Seek method to position to a specific row The Seek method requires the following conditions
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The underlying database table is indexed Additional properties of the SqlCeCommand object are set before executing the ExecuteReader method The index name and key value(s) are specified in the call to the Seek
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method The call to the Seek method is followed by a call to the Read method The advantage of using the Seek method is performance In fact, performance is the very reason why the NET Compact Framework development team added the Seek method to the product beginning with Version 11 Using the Seek method is almost always faster than using the WHERE clause of a SELECT statement for locating specific rows The disadvantage is that the Seek method provides access to only one table at a time, and knowledge of the index is required The former means you cannot combine the Seek method with the joining of two or more tables; the latter goes against
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Figure 612: The DataReader Program
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the very grain of relational database theory Of course, many programmers have gone against the grain when it was the faster way to go To illustrate both the Read and Seek methods, the following sample application, shown in Figure 612 and located in the DataReader project on the Web site, loads a ComboBox control with product key values When the user clicks on the ComboBox control, the fields of the selected product are displayed in the TextBox controls Listing 66 shows the code for this application
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Listing 66: Source Code for the DataReader Program
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using using using using using using using using System; SystemIO; SystemDrawing; SystemCollections; SystemWindowsForms; SystemData; SystemDataCommon; SystemDataSqlServerCe;
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namespace DataReader { /// <summary> /// Summary description for FormMain /// </summary> public class FormMain : SystemWindowsFormsForm { internal SystemWindowsFormsLabel lblCategoryName;
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internal internal internal internal internal internal SystemWindowsFormsLabel lblProductName; SystemWindowsFormsLabel lblProductID; SystemWindowsFormsTextBox textCategoryName; SystemWindowsFormsTextBox textProductName; SystemWindowsFormsTextBox textProductID; SystemWindowsFormsComboBox comboKeys;
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public FormMain() { // // Required for Windows Form Designer support // InitializeComponent(); } /// <summary> /// Clean up any resources being used /// </summary> protected override void Dispose( bool disposing ) { baseDispose( disposing ); } #region Windows Form Designer generated code
/// <summary> /// The main entry point for the application /// </summary> static void Main() { ApplicationRun(new FormMain()); }
// File path and name private string strFile = @"My Documents\ourProduceCosdf"; // Connection string private string strConn = "Data Source=" + @"My Documents\ourProduceCosdf"; // Select product keys private string strGetProductIDs = " SELECT ProductID " + "
FROM Products ";
// Select one product, joined with its category private string strGetOneProduct = " SELECT ProductID, ProductName, CategoryName " + " FROM Products P " + " JOIN Categories C on CCategoryID = PCategoryID " +
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// Used to bypass the SelectIndexChanged event // during the loading of the ComboBox private bool boolLoading = true;
private void FormMain_Load(object sender, EventArgs e) { // Display a close box thisMinimizeBox = false; // Let the form present itself ApplicationDoEvents(); // Ensure that the database exists if (! FileExists(strFile) ) { MessageBoxShow( "Database not found Run the CreateDatabase " + "program for this chapter first Then run " + "this program"); } // Load product keys into the ComboBox // and select the first one LoadProductIDs(); comboKeysSelectedIndex = 0; } private void comboKeys_SelectedIndexChanged(object sender, EventArgs e) { // A product key has been selected; retrieve // and display the corresponding product if (! boolLoading ) { LoadOneProduct((int)comboKeysSelectedItem); } } private void textProductName_Validated(object sender, EventArgs e) { // Update this product row in the database UpdateSelectedRow(intParse(textProductIDText), textProductNameText); } private void LoadProductIDs()