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As you ve seen in 5, creating a class to represent a UDT object is not particularly difficult, but it can be a rather tedious job. This problem is magnified when you have tables containing large numbers of columns. Human error may also arise if you frequently hand-code such classes, unnecessarily wasting time in debugging these classes later on. Fortunately, ODT.NET provides you a way to visually define UDT objects and to generate the corresponding .NET classes from these UDT objects. In this section, you will create a sample application to display a list of jobs from the database. This list of jobs will utilize an EMPLOYEE UDT as the data type for one of its fields. You will learn how to use ODT.NET to create this UDT and also generate the code to read the values of this UDT.

Irregularly shaped forms are often the trademark of cutting-edge consumer applications like photo editors, movie makers, and MP3 players. In the past, creating them required a bit of API wizardry. With .NET, creating a shaped form is almost effortless, thanks to GDI+. To create a simple shaped control in .NET, all you need to do is assign a new shape (represented by an instance of the System.Drawing.Region class) to the Control.Region property. There is more than one way to create a Region object, but one of the easiest is by using the GraphicsPath class, which allows you to build a complex shape out of as many sub-shapes as you need (as described in 7). You can then pass the GraphicsPath to the Region class constructor.

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In 7, you ll learn just how MySQL uses these key distribution statistics in determining which possible JOIN strategy to deploy for your SELECT statement Extra: This column contains extra information pertaining to this particular row s access strategy Again, we ll go over all the possible things you ll see in the Extra field in our next chapter For now, just think of it as any additional information that MySQL thinks you might find helpful in understanding how it s optimizing the SELECT statement you executed In the example in Listing 6-17, we see that MySQL has chosen to use the PRIMARY index on the http_auth table It just so happens that the PRIMARY index is the only index on the table that contains the username field, so it decides to use this index.

To visually create a UDT object, expand the data connection and right-click the User-Defined Types node in the Server Explorer. In the ensuing pop-up menu, select the New Object Type item shown in Figure 15-16.

The following example code creates a shaped form. It defines an ellipse with the same bounds of the form and adds it to a GraphicsPath. Once the GraphicsPath is assigned to the Region property of the form, only the part of the form that fits inside the ellipse is shown. private void SimpleShapedForm_Load(object sender, System.EventArgs e) { GraphicsPath path = new GraphicsPath(); path.AddEllipse(0, 0, this.Width, this.Height); this.Region = new Region(path); } Figure 23-1 shows this unusual form, displayed over an ordinary Notepad window so you can see how content underneath is displayed.

In this case, the access pattern is a range type, which makes sense since we re looking for usernames that begin with ud (LIKE 'ud%')..

Figure 23-1. A shaped form You can see part of the original window border at the top and bottom of the shaped form, and the single contained button in the middle. However, the form acts completely like an ellipse. For example, if you click in the cutout portion that the original rectangular form occupied (that is, just above the left edge of the ellipse), your click won t activate the form. Instead, you ll activate whatever application is currently underneath the form. You also can create a shaped form made up of a combination of shapes. In fact, these shapes don t even need to overlap. The following example creates the more unusual shaped form shown in Figure 23-2:

Figure 15-16. Creating a new UDT visually When you have done that, the screen shown in Figure 15-17 will appear. It allows you to visually define the properties and attributes of the UDT. You can specify the name of the UDT under the Type name field. Create the attributes of the UDT as shown in Figure 15-17. Try to use a mix of NVARCHAR2 and NUMBER data types.

private void CompoundShapedForm_Load(object sender, System.EventArgs e) { GraphicsPath path = new GraphicsPath(); path.AddEllipse(0, 0, this.Width / 2, this.Height / 2); path.AddRectangle(new Rectangle(this.Width / 2, this.Height / 4, this.Width / 2, this.Height / 4)); path.AddEllipse(this.Width / 2, this.Height / 2, this.Width / 2, this.Height / 2); this.Region = new Region(path); }

(Old data state)

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