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The MyISAM storage engine supports the R-tree index layout for indexing spatial data types. Spatial data types are geographical coordinates or three-dimensional data. Currently, MyISAM is the only storage engine that supports R-tree indexes, in versions of MySQL 4.1 and later. R-tree index layouts are based on the same tree structures as B-tree indexes, but they implement the comparison of values differently.

You can extend the technique shown in the previous example to create more a customizable user interface that s built out of a collection of TableLayoutPanel and FlowLayoutPanel objects. Doing so allows you to create more sophisticated, variable interfaces, like those that model business forms. The following example demonstrates one such example with a survey application. In this application, the code reads XML tags that define the required interface. These tags are stored in a file, although you could easily modify the code so that it reads a block of XML from another source, like a database. The code then loops through the elements in the XML document, translating them into the appropriate controls. As the control objects are created, they re added to the form. This logic is fairly involved, but it s not nearly as messy as it would have been with .NET 1.x. That s because the code uses autosizing and layout panels to avoid dealing directly with control sizes and position. As long as the control is added to the right container, the entire form flows without a problem. The basic structure of the form is made up of two pieces: A TableLayoutPanel with one column holds all the sections of the survey form. The TableLayoutPanel has a single column, with a width of 100 percent. Each section of the survey form is inserted as another panel (either a TableLayoutPanel or a FlowLayoutPanel depending on the type of content). This panel control is placed in a separate cell.

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Figure 14-16. Specifying the details of a PL/SQL package method. When this is done, click the OK buttons in both windows. ODT.NET will then create the PL/SQL package according to your specified settings, as shown in Figure 14-17. It will then be up to you to fill in the meat for these stored procedures.

The top-level TableLayout is also placed into an ordinary Panel container. This extra step is one approach to add a border around the TableLayoutPanel without adding a border between cells. (Another approach would be to perform some custom drawing in response to the Form.Paint event.) Figure 21-21 shows a sample survey form.

4. The name balanced tree index reflects the nature of the indexing algorithm. Whether the B in B-tree actually stands for balanced is debatable, since the creator of the algorithm was Rudolf Bayer (see http://www.nist.gov/dads/HTML/btree.html).

All forms are modeled as XML files with a root <Form> element. In the root element, you can add one of four different panels, depending on the type of survey content you need: <TextBoxPanel>. Rendered as a two-column table, with labels on the left and text boxes for data entry on the right. Each row requires a separate <TextItem> tag. <GroupSelectionPanel>. Rendered as a group of radio buttons, one for each item, with a caption at the top. Each radio button requires a separate <SelectionItem> tag. <CheckBoxListPanel>. Rendered as a CheckBoxList control, which shows multiple items in a list box, each of which can be checked or unchecked. Each item requires a separate <SelectionItem> tag. <LargeTextBoxPanel>. Rendered as one or more full-width multiple line text boxes, with a caption at the top. Each text box requires a separate <TextItem> tag. The form code defines an enumeration that represents the four allowed types of panels:

In the following section, we will take a look at how you can debug PL/SQL code within the Visual Studio IDE.

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