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Table 14-5. Useful TreeView Properties (Continued)

Calculates the average of all values in a given numeric field Calculates the sum of all values in a given numeric field Finds the minimum or maximum value in a number field

Sets the number of pixels between each level of nodes in the TreeView. Set this to 0 to create a nonindented TreeView, which saves space. A nonindented TreeView allows you to emulate an in-place menu (see, for example, Figure 14-12). Lets you use a predefined collection of node images for collapsed, expanded, and nonexpandable nodes. You specify one of the values in the TreeViewImageSet enumeration. You can override any node images you want to change by setting the CollapseImageUrl, ExpandImageUrl, and NoExpandImageUrl properties. Sets the pictures that are shown next to nodes for collapsed nodes (CollapseImageUrl) and expanded nodes (ExpandImageUrl). The NoExpandImageUrl is used if the node doesn t have any children. If you don t want to create your own custom node images, you can use the ImageSet property instead to use one of several built-in image collections. Lets a node text wrap over more than one line when set to True. Hides the expand/collapse boxes when set to False. This isn t recommended, because the user won t have a way to expand or collapse a level without clicking it (which causes the browser to navigate to the page). Adds lines that connect every node when set to True. Shows a check box next to every node when set to True. This isn t terribly useful for site maps, but it is useful with other types of trees.

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Returns the number of rows in the result set Returns the number of unique (and non-null) rows in the result set for the specified field

Properties give you a fair bit of customizing power, but one of the most interesting formatting features comes from TreeView styles, which are described in the next section.

For example, here s a query that returns a single value the number of records in the Authors table: SELECT COUNT(*) FROM Authors And here s how you could calculate the total quantity of all sales by adding together the qty field in each record: SELECT SUM(qty) FROM Sales

Unfortunately, one of the biggest issues when working with JSON in PHP is that JavaScript and PHP do not have directly compatible data types. JavaScript contains two collection types: objects that are key/value pair collections and are analogous to an associative array in PHP, and arrays that are strictly lists and are analogous to a numerically indexed array in PHP. Any JSON implementation must include at least two methods: one to serialize a parameter into a JSON-encoded string, and another to undo this operation and return a JSON string to a variable. You can think of JSON encoding as a type of serialization. The following sections introduce two alternative ways of using JSON with PHP: The JSON PECL extension The Zend Framework Json.org publishes the JSON parser script (json.js). You should download this now from http://www.json.org/json.js, as most JSON applications require it to operate.

Styles are represented by the TreeNodeStyle class, which derives from the more conventional Style class. As with other rich controls, the styles give you options to set background and foreground colors, fonts, and borders. Additionally, the TreeNodeStyle class adds the node-specific style properties shown in Table 14-6. These properties deal with the node image and the spacing around a node.

The SQL Update statement selects all the records that match a specified search expression and then modifies them all according to an update expression. At its simplest, the Update statement has the following format: UPDATE [table] SET [update_expression] WHERE [search_condition] Typically, you ll use an Update statement to modify a single record. The following example adjusts the phone column in a single author record. It uses the unique author ID to find the correct row. UPDATE Authors SET phone='408 496-2222' WHERE au_id='172-32-1176' This statement returns the number of affected rows. (See Figure 14-7 for an example in Visual Studio.) However, it won t display the change. To do that, you need to request the row by performing another Select statement:

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