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The MyISAM record structure The .MYI file structure The InnoDB record structure The InnoDB page structure Although the documentation is extremely helpful in researching certain key elements of the server (particularly the query optimizer), it is worth noting that the internal documentation does not directly address how the different subsystems interact with each other. To determine this interaction, it is necessary to examine the source code itself and the comments of the developers.2

can t create an extender provider that provides multiple properties you simply need to apply the ProvideProperty attribute once for each property, and include the corresponding SetXxx() and GetXxx() methods for each one.

You ve successfully installed the Oracle database, ODAC.NET (including ODT.NET) as well as the Oracle providers for ASP.NET on your machine. You now have all the tools you need to start writing ODP.NET applications.

Caution Even the most recent internals.texi documentation has a number of bad hyperlinks, references, and incorrect filenames and paths, so do your homework before you take everything for granted. The

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You ll notice that the GetProperty() and SetProperty() methods accept a reference to the target control. That s because a single instance of your extender can be reused to extend dozens of controls (and, conversely, two similar providers can extend the same control). To support this sort of scenario, it s up to you to keep track of all the extended controls in your extender provider. The usual technique is to use a collection. In the StatusStripHelpLabel, a type-safe dictionary collection allows the provider to keep track of registered controls, and the supplied Help text for each one: // The collection for tracking the Help text information. private Dictionary<ToolStripItem, string> helpText = new Dictionary<ToolStripItem, string>();

To complete the StatusStripHelpLabel, you need to add the implementation logic for the SetHelpText() and GetHelpText() methods. The first step is to fill in the SetHelpText() method, which requires the most coding. When the Help text is set, the provider needs to add the supplied ToolStrip to the internal collection for tracking, and then dynamically attach event handlers to receive the MouseEnter and MouseLeave events. Additionally, your code needs to politely detach the event handlers when a blank Help string is supplied. Finally, the code needs to avoid hooking itself up more than once. The Visual Studio designer is prone to calling the SetXxx() method multiple times in a row, and you don t want the overhead of detaching and reattaching the event handlers with each call. Here s the complete SetHelpText() code: public void SetHelpText(ToolStripItem extendee, string value) { // A blank value string indicates the control is trying to unregister. if (value.Length == 0) { // Check if the item is registered. if (!helpText.ContainsKey(extendee) && !DesignMode) {

internals.texi documentation may not be as up-to-date as your MySQL server version!

Summary

// Unregister. extendee.MouseEnter -= new EventHandler(MenuSelect); extendee.MouseLeave -= new EventHandler(MenuClear); } helpText.Remove(extendee); } else { // The user has supplied Help text. // Check if the item is registered. if (!helpText.ContainsKey(extendee) && !DesignMode) { // It hasn't been registered yet. Register it now. extendee.MouseEnter += new EventHandler(MenuSelect); extendee.MouseLeave += new EventHandler(MenuClear); } // Either way, update the Help text. helpText[extendee] = value; } }

TEXI is the GNU standard documentation format. A number of utilities can convert the TEXI source documentation to other, perhaps more readable or portable, formats. For those of you using Emacs or some variant of it, that editor supports a TEXI major mode for easy reading. If you prefer an HTML version, you can use the free Perl-based utility texi2html, which can generate a highly configurable HTML output of a TEXI source document. texi2html is available for download from https://texi2html.cvshome.org/. Once you ve downloaded this utility, you can install it, like so: # # # # tar -xzvf texi2html-1.76.tar.gz cd texi2html-1.6 ./configure make install

When the MouseEnter event occurs, the Help text is retrieved and displayed in the StatusStrip label. When the MouseLeave event occurs, the text is cleared. You could just as easily monitor different events (like key presses, focus changes, and so on). private void MenuSelect(object sender, System.EventArgs e) { base.Text = helpText[(ToolStripMenuItem)sender]; } private void MenuClear(object sender, System.EventArgs e) { base.Text = string.Empty; } Implementing the GetHelpText() method is much quicker. It simply returns the Help text from the dictionary:

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