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Different storage engines implement some or all of these member methods In cases where a storage engine does not implement a specific feature, the member method is simply left alone as a placeholder for possible future development For instance, certain administrative commands, like OPTIMIZE or ANALYZE, require that the storage engine implement a specialized way of optimizing or analyzing the contents of a particular table for that storage engine Therefore, the handler class provides placeholder member methods (optimize() and analyze()) for the subclass to implement, if it wants to The member variable table is extremely important for the handler, as it stores a pointer to an st_table struct This struct contains information about the table, its fields, and some meta information.

same format as the descriptors in the TNSNames.ora file). Let s take a closer look at the format of this descriptor in Listing 3-3. Listing 3-3. Connecting to the Database Without TNSNames.ora

The resulting context menu for the DirectoryTree control is shown in Figure 26-3.

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This member variable, and four member methods, are in a protected area of the handler class, which means that only classes that inherit from the handler class specifically, the storage engine handler subclasses can use or see those member variables and methods Remember that not all the storage engines actually implement each of handler s member methods The handler class definition provides default return values or functional equivalents, which we ve omitted here for brevity However, certain member methods must be implemented by the specific storage engine subclass to make the handler at least useful The following are some of these methods: rnd_init(): This method is responsible for preparing the handler for a scan of the table data rnd_next(): This method reads the next row of table data into a buffer, which is passed to the function.

Figure 26-3. Designer verbs Generally, you won t use your designer verbs to provide settings for a simple property. A more interesting technique is to provide higher-level configuration operations that adjust several properties at once. Implementing this design is refreshingly easy. Just add a Windows Form to your project and display it when the appropriate designer verb is selected. Here s another simple example using the DirectoryTree. This time, only a single verb is available, which displays a window that allows the user to choose a drive. When a drive is chosen, a public form-level variable is set, and the designer retrieves it and applies the change. This approach is more manageable than the previous design, and doesn t clutter the context menu with drive letters. public class DirectoryTreeDesigner : ControlDesigner { private DesignerVerbCollection verbs = new DesignerVerbCollection(); public DirectoryTreeDesigner() { verbs.Add(new DesignerVerb("Set Drive", new EventHandler(OnVerb))); } public override DesignerVerbCollection Verbs { get { return verbs; } }

public void btnConnectNow_Click(System.Object sender, System.EventArgs e)

protected void OnVerb(object sender, EventArgs e) { // Show the form. SelectDrive frm = new SelectDrive(); frm.DriveSelection = ((DirectoryTree)this.Control).Drive; frm.ShowDialog(); // Adjust the associated control. ((DirectoryTree)this.Control).Drive = frm.DriveSelection; } } The SelectDrive form is quite simple it s the selection dialog box used in 13 as a modal type editor. It shows a list of available drives, and stores the user s selection in the SelectDrive.Drive property.

The data passed into the buffer must be in a format consistent with the internal MySQL record format..

Note When you add a form like SelectDrive to a control project, the client will be able to see the form class in your designer and create and display instances of it. If this isn t the behavior you want, you need to declare your form class as internal. (Another alternative is to nest it inside your control class, and declare it as private or protected, but if you do this you have to forego Visual Studio s design-time support for the form).

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