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In the Windows operating system, a user can work with only one control at a time. The control that is currently receiving the user s key presses is the control that has focus. Sometimes this control is drawn slightly differently. For example, the button control uses a dotted line around its caption to show that it has the focus. Figure 2-8 shows focused and unfocused buttons with both the Windows XP visual styles and the classic Windows look.

To commit changes in a dataset back to the database, you have to first create the relevant UPDATE, INSERT, and DELETE command objects. You can create a Command object that calls a stored procedure using the Database.GetStoredProcCommand method. You will need to pass the name of the stored procedure to this method. After defining the relevant Command objects, you will need to call the Database.UpdateDataset method, passing in the DataSet object, Command objects and the name of the table to update. The full code to do all this is shown in Listing 13-9. Listing 13-9. Updating Multiple Rows from a Dataset

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Figure 2-8. Focused buttons To move the focus, the user can click the mouse or use the Tab and arrow keys. The developer has to take some care to make sure that the Tab key moves focus in a logical manner (generally from left to right and then down the form). The developer also has to choose the control that should receive the focus when the window is first presented. All controls that support focusing provide a Boolean TabStop property. When set to true, the control can receive focus through the Tab key. When set to false, the control is left out of the tab sequence and can be reached only using a mouse click.

Your first question might be, Is there a MySQL profiler The flat answer is no, there isn t. Although MySQL provides some tools that enable you to do profiling (to a certain extent) of the SQL statements being run against the server, MySQL does not currently come bundled with a profiler program able to generate storable trace files. If you are coming from a Microsoft SQL Server background and have experience using the SQL Server Profiler, you will still be able to use your basic knowledge of how traces and profiling work, but unfortunately, MySQL has no similar tool. There are some third-party vendors who make some purported profilers, but these merely display the binary log file data generated by MySQL and are not hooked in to MySQL s process management directly. Here, we will go over some tools that you can use to simulate a true profiler environment, so that you can diagnose issues effectively. These tools will prove invaluable to you as you tackle the often-difficult problem of figuring out what is going on in your systems. We ll cover the following tools of the trade: The SHOW FULL PROCESSLIST and SHOW STATUS commands The EXPLAIN command The slow query and general query logs Mytop The Zend Advanced PHP Debugger extension

private void btnUpdateFromDataset_Click(object sender, EventArgs e)

Tip You should set the TabStop property to false for controls that can accept key presses but are not directly accessed by the user in your application. For example, you might provide a DataGridView control, but use it to display static information. Of course, the disadvantage to this approach is that setting the TabStop to false also means the user will need to use the mouse to scroll the control if its contents extend beyond the bounds of its display region.

The first tool in any MySQL administrator s tool belt is the SHOW FULL PROCESSLIST command. SHOW FULL PROCESSLIST returns the threads that are active in the MySQL server as a snapshot of the connection resources used by MySQL at the time the SHOW FULL PROCESSLIST command was executed. Table 6-3 lists the fields returned by the command. Table 6-3. Fields Returned from SHOW FULL PROCESSLIST

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