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The Global class simply provides the current AppHelp instance through a static Help member: public static class Global { public static AppHelp Help = new Help(); } The AppHelp.ShowHelp() method examines the submitted form, compares it with a list of forms in a database, and thus determines the appropriate context topic, which it launches. Note that for performance reasons, this list of form-topic mappings would be read once when the application starts, and stored in a member variable. The AppHelp class is shown in the following example. The database code to retrieve the FormHelpMappings table has been omitted. public class AppHelp { public DataTable FormHelpMappings = null; public string HelpFile = ""; public void ShowHelp(Form helpForm) { foreach (DataRow row in FormHelpMappings.Rows) { if (helpForm.Name.CompareTo((string)row["FormName"]) == 0) { // A match was found. Launch the appropriate Help topic. Help.ShowHelp(helpForm, HelpFile, HelpNavigator.Topic, row["Topic"].ToString()); return; } } } }

0.0004525 0.0008028 0.0084713 0.0779376 0.9389645

Another reason you might take control of the Help process is to get around the limitations of form-based Help. Form-specific Help works well in a dialog-based application, but falters when you create a document-based or workspace-based program where users perform a number of different tasks from the same window. Rather than try to write the code to modify

This means that every UPDATE or DELETE statement that is received through your MySQL server session is wrapped in implicit START TRANSACTION and COMMIT commands. Consequently, MySQL actually converts this SQL code to the following execution: mysql> START TRANSACTION; mysql> UPDATE account SET balance = balance 100 WHERE customer = 'Jane Doe' AND account = 'checking'; mysql> COMMIT; mysql> START TRANSACTION; mysql> UPDATE account SET balance = balance + 100 WHERE customer = 'Jane Doe' AND account = 'savings'; mysql> COMMIT;

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Help keywords dynamically, you can use the AppHelp class to track the current user s task. When Help is invoked, you can use this information to determine what topic should be shown. Here s the remodeled AppHelp class. In this case, it doesn t decide what topic to show based on form name, but rather based on one of the preset task types. The logic that links tasks to topics is coded centrally in the AppHelp class (not in the user interface), and it could be moved into a database for even more control. An enumeration is used to ensure that the client code always sets a valid value. public class AppHelp { // These are the types of tasks that have associated Help topics. public enum Task { CreatingReport, CreatingReportWithWizard, ManagingReportFiles, ImportingReport } private string helpFile; public string HelpFile { get { return helpFile; } set { helpFile = value; } } private Task currentTask; public Task CurrentTask { get { return currentTask; } set { currentTask = value; } } // Show Help based on the current task. public void ShowHelp(Form helpForm) { string topic = ""; switch (CurrentTask) { case Task.CreatingReport: topic = "Reports.htm"; break; case Task.CreatingReportWithWizard: topic = "Wizard.htm"; break; case Task.ManagingReportFiles: topic = "Reports.htm"; break;

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Figure 3-2 shows how MySQL actually handles these statements while operating in its default autocommit mode.

case Task.ImportingReport: topic = "Importing.htm"; break; default: return; } Help.ShowHelp(helpForm, HelpFile, HelpNavigator.Topic, topic); } } Now the code simply needs to remember to set the task at the appropriate times. Global.Help.CurrentTask = AppHelp.Task.CreatingReport; When Help is invoked, the form doesn t need to determine what task is underway the AppHelp class simply uses the most recent task setting. private void form1_HelpRequested(object sender { Global.Help.ShowHelp(this); } HelpEventArgs e)

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This system could be made much more complex by using a task list or tracking multiple different types of context information in the AppHelp class, which is conceptually similar to the way many advanced consumer applications (such as office productivity software) work.

This autocommit behavior is perfect for single statements, because MySQL is ensuring that the data modifications are indeed flushed to disk, and it maintains a consistent physical state to the data store. But what would happen in the scenario depicted in Figure 3-3

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