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Figure 8-17. Data binding with a master-detail list The lists are filled in the normal manner: private BindingManagerBase categoryBinding; private DataSet ds; private void MasterDetail_Load(object sender, System.EventArgs e) { ds = Program.StoreDB.GetCategoriesAndProducts(); // Bind the lists to different tables. lstCategory.DataSource = ds.Tables["Categories"]; lstCategory.DisplayMember = "CategoryName"; lstProduct.DataSource = ds.Tables["Products"]; lstProduct.DisplayMember = "ModelName"; // Track the binding context and handle position changing. categoryBinding = this.BindingContext[ds.Tables["Categories"]]; categoryBinding.PositionChanged += new EventHandler(Binding_PositionChanged); // Update child table at startup. UpdateProducts(); } Now, when the PositionChanged event is detected for the category binding, the current view of products is automatically modified:

public void SendShapeToBack(Shape backShape) { int maxZOrder = 0; foreach (Shape shape in List) { if (shapeZOrder > maxZOrder) maxZOrder = shapeZOrder; } maxZOrder++; backShapeZOrder = maxZOrder; } But the most useful method of the ShapeCollection is HitTest(), which loops through all the shapes and calls their HitTest() and HitTestBorder() methods, looking for a hit The important part of this method is that before it starts checking, it sorts the collection so that the lowest z-index elements are first This ensures that if one image is layered on top of another, the image on top has the first chance to receive the mouse click public Shape HitTest(Point point) { Sort(); foreach (Shape shape in List) { if (shapeHitTest(point) || shapeHitTestBorder(point)) { return shape; } } return null; } public void Sort() { InnerListSort(); } However, this sorting method won t suit all tasks.

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MySQL uses the slow query log to record any query whose execution time exceeds the long_query_time configuration variable. This log can be very helpful when used in conjunction with the bundled Perl script mysqldumpslow, which simply groups and sorts the logged queries into a more readable format. Before you can use this utility, however, you must enable the slow query log in your configuration file. Insert the following lines into /etc/my.cnf (or some other MySQL configuration file): log-slow-queries long_query_time=2 Here, we ve told MySQL to consider all queries taking two seconds and longer to execute as a slow query. You can optionally provide a filename for the log-slow-queries argument. By

the database over the network using the same particulars. That user would then gain access to all the underlying tables in the database. CAS can help prevent this because it only allows access to the Oracle database if the exact executing assembly was already granted permission to do so by the .NET administrator.

The problem occurs when painting a series of shapes In this case, you need higher z-indexes first and smaller values at the end of the list, which is the reverse of usual numeric ordering That way, objects that are at the back are drawn first, and shape objects that are on subsequent layers are drawn over them To support this design, you need to add a ReverseSort() method that performs the reverse ordering The IComparable implementation that s provided in the Shape class is no longer of any help, because it uses the lowest-to-highest sort Instead, you need to perform the sorting on your own A more elegant option is to create a dedicated class that implements IComparer and encapsulates your ordering logic This way, you don t need to code a sorting algorithm instead, you simply define how a set of two shapes should be compared to one another.

default, the log is stored in /var/log/systemname-slow.log. If you do change the log to a specific filename, remember that when you execute mysqldumpslow, you ll need to provide that filename. Once you ve made the changes, you should restart mysqld to have the changes take effect. Then your queries will be logged if they exceed the long_query_time.

Most organizations need to run their databases 24 hours a day and 7 days a week with as much resistance to failure as possible. Database downtime of even a few minutes can be disastrous to organizations like banks or stock exchanges. The database and the application must therefore work in tandem to Ensure maximum availability of service Reduce the impact of data loss in the event of failure Immediately and automatically invoke organization-defined protocols in the event of failure or recovery from failure

The IComparer interface defines a single Compare() method, which takes two objects and performs the comparison The trick is to reverse the usual order by calling CompareTo() on the second object instead of the first..

Note Prior to MySQL version 4.1, you should also include the log-long-format configuration option in

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