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To create any button control class, it makes most sense to derive directly from Control, because you need to implement all the drawing on your own. public abstract class AnimatedButtonBase : Control { ... } The AnimatedButtonBase control is declared as an abstract class, which means it can t be instantiated directly. Although this design is conceptually good, it does mean you ll receive a design-time warning if you try to switch to design view while creating a class that derives from AnimatedButtonBase. (The specific problem is that the designer can t create abstract classes, as discussed in 11 with visual inheritance.) If this bothers you, you can choose to implement AnimatedButtonBase as a normal class, but add the ToolboxItem attribute to hide it so it won t appear in the Visual Studio toolbox. In the following sections, you ll see how to build each piece of the AnimatedButtonBase class.

To run the code samples later on, you will need to key in some data into the OVERSEAS_JOBS table. To insert a UDT object, you can specify it in this format:

All buttons should implement the IButtonControl interface, which allows other programs to recognize them as being inherently button-like. By implementing IButtonControl, your button control gains the following features:

When a transaction attempts to either read or write a piece of data, it must acquire a lock on that piece of data, which we ll refer to for now as a resource. This lock is simply information that informs all the other processes running in the database server that the process running this transaction intends to do something with the resource. Exactly what the process intends to do with the resource determines the type of lock placed on the resource.

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Other classes can programmatically trigger a button click in your control. Your control can be used as a default button for a form (if you set the Form.AcceptButton or Form.CancelButton properties). Your control can be used to close a modal form and return a value from the DialogResult enumeration. The most important part of the IButtonControl interface is the PerformClick() method. Other classes can call this method to trigger a click programmatically. This is the basic requirement for all the features described previously. For example, if you want your button to be an AcceptButton for a form, the form simply needs a way to trigger a click when the Enter key is pressed. It does this by calling IButtonControl.PerformClick(). Additionally, the IButtonControl interface requires a DialogResult property that stores the result associated with your button (like OK, Cancel, and so on), and a NotifyDefault() method that alerts your control that it has become the default button, in which case it can adjust its rendering if desired. Here s the definition of the AnimatedButtonBase class, with the members that are required to implement IButtonControl public abstract class AnimatedButtonBase : Control, IButtonControl { public void PerformClick() { OnClick(EventArgs.Empty); } private DialogResult dialogResult; public DialogResult DialogResult { get { return dialogResult; } set { dialogResult = value; } } public void NotifyDefault(bool value) { // Fires when the button is made into a default. // You could set properties to adjust the rendering, // but that's not necessary. OnNotifyDefault(value); } public virtual void OnNotifyDefault(bool value) { // This method can be overriden in derived classes // if they wish to apply rendering customizations. } }

UDT_NAME(<fieldvalue1>, <fieldvalue2>, <fieldvalue3>)

The granularity of a lock determines the size, or extent, of the resource being locked. In database server terms, there are three basic levels of lock granularity when we re dealing with actual table data:

.NET includes a rich complement of methods for mouse handling (see Table 2-5). Using these events, you can react to clicks and mouse movements.

Run the following SQL statements either through the ODT.NET query window or through SQL*Plus:

MouseEnter MouseMove*

Table-level locks place a lock on the entire set of table data. Page-level locks place a lock on the specific data page where the requested data can be found. Row-level locks lock only the specific row of data within the data page where the requested data can be found. The different storage engines in MySQL support varying levels of lock granularity, which affect how resources are managed for concurrent requests for the same data. We ll examine the differences between the storage engines in 5.

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