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Figure 15-29. The OVERSEAS_JOBS records displayed in the data grid You will now write some code in this ToString() method. Open the Employee.cs class file, and write the highlighted code shown in Listing 15-2. This will tell the UDT object to represent itself using the Name, ID, and Salary fields of the employee.

The REPEATABLE READ isolation level resolves the anomaly of nonrepeatable reads by placing a special lock on the resources used by the transaction so that other transactions must wait for the first transaction to complete before reading data from those resources used by the first transaction In our scenario from the previous section, a REPEATABLE READ isolation level would prevent transaction B from reading the customers table or the row in the customers table, depending on the lock granularity that is being used by transaction A In this way, the transaction processing system ensures that nonrepeatable reads are avoided However, even with this level of isolation, a third phenomenon can occur, called phantom reads A phantom read is possible when transaction A submits a read request for a group of data.

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The next example is a little more interesting, because it overrides the HitTest() method to create a button where only a portion is clickable. This portion is an image icon that is displayed just to the left of the text. When the mouse is positioned over the image, the image appears with a raised border (see Figure 23-8).

Figure 23-8. The PopImageButton This control project raises some unique, subtle challenges: The clickable portion of the button should include only the image. Thus, the control needs to use hit testing when a click is detected, and suppress click events if the text portion is clicked. The button must be able to deal with any valid image size. When designing this control, you need to add an Image property to store the picture it will display. Here s the first part of the code for the PopImageButton: public class PopImageButton : AnimatedButtonBase { private Image image; private Rectangle bounds; public Image Image { get { return image; } set { image = value; if (image != null) { bounds = new Rectangle(0, 0, image.Width + 5, image.Height + 5); }

public override string ToString()

The data is used in the transaction, and then another read request for a similar group of data is submitted later in the transaction Transaction B, meanwhile, has added records to the resource read in transaction A, so on the second read request in transaction A, more records were returned than on the first request For example, let s say that transaction A issues the following statements: mysql> START TRANSACTION; mysql> SELECT * FROM customers WHERE create_date > '2005-05-01'; Then the transaction does some sort of operations on this customer data, such as summing the number of orders placed by these customers While it is doing this, transaction B starts and inserts new customer records into the table.

Invalidate(); } } ... Notice that a private member variable called bounds is used to track the drawing area of the control. This rectangle is slightly larger than the image itself because it needs to accommodate the focus rectangle. The HitTest() method uses the bounds to test the placement of the mouse cursor: ... protected override bool HitTest(int X, int Y) { // Check if the mouse pointer is over the button. if (image == null) return false; else return bounds.Contains(X, Y); } ... The drawing code uses the same paint methods you saw earlier. It uses a raised threedimensional border when the mouse is positioned over the button, and a sunken border when it is clicked, which is similar to the image bar style used in Microsoft Outlook. The text is placed to the right of the picture, and is vertically centered with the midpoint of the image by measuring the image and font sizes. ... protected override void PaintNormal(Graphics g) { if (image != null) g.DrawImage(image, 2, 2); PaintText(g); } protected override void PaintMouseOver(Graphics g) { if (image != null) { ControlPaint.DrawBorder3D(g, bounds, Border3DStyle.Raised, Border3DSide.All); g.DrawImage(image, 2, 2); } PaintText(g); }

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