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Transaction A completes whatever operations it was performing, and then issues the following statements: mysql> SELECT * FROM customers WHERE create_date > '2005-05-01'; mysql> COMMIT; intending to print a summary of the customers data that was operated on during the transaction for before and after snapshots Yet, unfortunately, transaction B has inserted new customer records during transaction A s execution, so the after snapshot contains more records than the before snapshot These additional records weren t locked during the first SELECT in transaction A because, of course, they didn t exist yet These new records are called phantoms The REPEATABLE READ isolation level does not prevent phantom rows from occurring In order to prevent this anomaly, the SERIALIZABLE isolation level exists..

{ // TODO : Return a string that represents the current object return "Name:" + m_EMPLOYEENAME + "\n" + "ID:" + m_EMPLOYEEID + "\n" + "Salary:" + m_EMPLOYEESALARY; } Now try running the same form again. This time, you will see some data appear in the PERSON_IN_CHARGE column, as shown in Figure 15-30. If you mouse-over the data, you will be able to see the individual properties of the UDT (as you ve defined via the ToString() function).

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protected override void PaintPushed(Graphics g) { if (image != null) { ControlPaint.DrawBorder3D(g, bounds, Border3DStyle.Sunken, Border3DSide.All); g.DrawImage(image, 3, 3); } PaintText(g); } protected override void PaintDisabled(Graphics g) { if (image != null) { ControlPaint.DrawImageDisabled(g, image, 2, 2, BackColor); } PaintText(g); } ... The drawing logic benefits from the ControlPaint class, which provides the DrawBorder3D() and the DrawImageDisabled() methods. This class was described in 7. Additionally, a private PaintText() method draws the text, because it s rendered the same for all states: ... private void PaintText(Graphics g) { // If there is no image, center the text (vertically) between // the borders of the control. // If there is an image, center the text to the midline of the image. int y = 0; if (image == null) y = Height; else y = bounds.Height; SolidBrush brush = new SolidBrush(ForeColor); g.DrawString(Text, Font, brush, bounds.Width + 3, (y - Font.Height) / 2); brush.Dispose(); } }

There s clearly a lot more you could add to this button control. For example, you could allow the user to change the orientation, place the text under the image, add support for text wrapping, or even create a compound control that contains a collection of images.

The SERIALIZABLE isolation level is the strongest protection against the read anomalies we ve described. At the SERIALIZABLE level, no phantom reads are allowed, because the transaction processing system locks the resource so that records cannot be appended to the tables being operated on in another transaction.

Figure 15-30. The details of the PERSON_IN_CHARGE column What s important to note from this exercise is that you could individually refer to each attribute of the UDT as a class property in your .NET code. UDT classes have the benefit of strongly-typing UDT objects in the database they allow you to pass UDT objects around in your code and to manipulate them just like any other class. Attribute names are strongly typed, which reduces human error and improves integration with IntelliSense. On top of that, ODT.NET now makes it easier than ever to generate .NET classes from large UDT objects, removing the mundane and tedious parts of your ODP.NET development experience. The following list contains some of the main reasons why you might want to use the ODT.NET UDT class generation features in your project: Saves time: Generating UDT classes is much easier than coding them by hand. Less prone to human error: Letting ODT.NET generate the code from a UDT object reduces potential problems arising from human error. Easier to manage and more flexible: You can visually map each UDT attribute to a .NET data type. This makes it easier to specify how your UDT attributes are represented in the generated .NET class.

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