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Let s restart the experiment from Connection 1 with the following statements: mysql> SET GLOBAL TRANSACTION ISOLATION LEVEL REPEATABLE READ; Query OK, 0 rows affected (0.00 sec) mysql> START TRANSACTION; Query OK, 0 rows affected (0.00 sec) Then, in Connection 2, start a new session and a new transaction, with a SELECT from the numbers table: mysql> START TRANSACTION; Query OK, 0 rows affected (0.00 sec) mysql> SELECT MAX(my_number) FROM numbers; +----------------+ | MAX(my_number) | +----------------+ | 6 | +----------------+ 1 row in set (0.00 sec) Everything is the same so far. Now, switch back to Connection 1, add a new record to the numbers table, and then COMMIT the transaction: mysql> INSERT INTO numbers VALUES (7); Query OK, 1 row affected (0.02 sec) mysql> COMMIT; Query OK, 0 rows affected (0.06 sec) Switch back to Connection 2 and rerun the SELECT statement: mysql> SELECT MAX(my_number) FROM numbers; +----------------+ | MAX(my_number) | +----------------+ | 6 | +----------------+ 1 row in set (0.00 sec) Aha! Even though the first transaction has been committed, our second transaction does not see the changes. Why Because identical reads within a transaction with the isolation level set to REPEATABLE READ must be consistent (thus, repeatable). InnoDB accomplishes this feat by taking a snapshot of the data returned in the first SELECT MAX(my_number) FROM numbers statement and ensuring that this snapshot was used in the next SELECT statement.

The drawing program works by dynamically creating an instance of a custom Shape control. It supports rectangles, circles, and triangles, but it could easily support any arbitrary or unusual shape. Before you consider the Shape control, you need to understand one possible problem. If the user draws a circle, you want the circle shape to act like a circle for all mouse operations. In other words, the user shouldn t be able to click on a part of the control outside the circle and use that to move the control. Similarly, this invisible portion of the control shouldn t overwrite other controls on the drawing surface. Figure 24-2 shows a drawing program with shapes that doesn t take this into account.

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Figure 24-2. A flawed drawing program Luckily, .NET makes it easy to create a control that has a nonrectangular bounding area. (In fact, you saw this technique in 23 with irregularly shaped forms.) All that s required is to set the Control.Region property, which defines a new clipping region. Note that this does have a minor side effect: The control cannot be as effectively antialiased (or blended with the background). As a result, the border appears more jagged. Overall, the Shape control needs to have the following key features: It provides a ShapeType enumeration that defines the shapes it can represent. The programmer chooses a shape by setting the Shape property. (Another option would be to create a separate class for each shape type. However, in this example the shape drawing is quite simple, so encapsulating it in a single class is still practical.) The Shape control uses a private path member variable that references a GraphicsPath object with the associated shape. Whenever the Shape property is modified, the control creates a new GraphicsPath, and adds the appropriate shape to it. It then sets the control s Region property, effectively setting its clipping bounds to match the shape. The painting logic is the easiest part. It simply uses the FillPath() method to draw the shape, and the DrawPath() method to outline it. Here s the complete Shape class code: public class Shape : System.Windows.Forms.Control { // The types of shapes supported by this control. public enum ShapeType { Rectangle, Ellipse, Triangle }

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Note The ODP.NET package that is tailored for xcopy has a smaller footprint than the one installed through the Oracle Universal Installer, because xcopy does not install ODP.NET documentation and code samples.

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