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You can use all the comparison operators with any numeric types. With string data types, you can use only the equality operators (== and !=). C# doesn t support other types of string comparison operators instead, you need to use the String.Compare() method. The String.Compare() method deems that a string is less than another string if it occurs earlier in an alphabetic sort. Thus, apple is less than attach. The return value from String.Compare is 0 if the strings match, 1 if the first supplied string is greater than the second, and 1 if the first string is less than the second. Here s an example: int result; result = String.Compare("apple", "attach"); result = String.Compare("apple", "all"); result = String.Compare("apple", "apple"); // result = -1 // result = 1 // result = 0

In PHP applications, you will typically use a relational database to store the data your application creates and references. One of the biggest problems with databases is the inability to interact with them in a portable and interchangeable manner. If you ve ever ported an application from one database to another, you ve probably needed to refactor an extremely large amount of code, because the possible need for such a change was not considered when the application was developed. With applications that use a database, the factory pattern can help you in two ways: It will make it easy for your software to support many different database platforms, a feature which will help to expand your customer base. If your software is in-house, it will guarantee that if you need to change databases, porting the application to another platform will be a trivial job. Listing 3-6 demonstrates the concept of using a database factory. You may wish to create a database table called user to test it. This table should define a single varchar column named email. Listing 3-6. Using a Factory for Database Portability interface IDatabaseBindings { public function userExists($email); } class PGSQL implements IDatabaseBindings { protected $_connection; public function __construct() { $this->_connection = pg_connect('dbname=example_db'); } public function userExists($email) { $emailEscaped = pg_escape_string($email); $query = "select 1 from users where email = '". $emailEscaped ."'"; if($result = pg_query($query, $this->_connecion)) { return (pg_num_rows($result) > 0) true:false;

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Clearly, styles give you a lot of control over how different nodes are displayed. To apply a simple TreeView makeover, and to use the same style settings for each node in the TreeView, you apply style settings through the TreeView.NodeStyle property. You can do this directly in the control tag or by using the Properties window. For example, here s a TreeView that applies a custom font, font size, text color, padding, and spacing: <asp:TreeView ID="TreeView1" runat="server" DataSourceID="SiteMapDataSource1"> <NodeStyle Font-Names="Tahoma" Font-Size="10pt" ForeColor="Blue" HorizontalPadding="5px" NodeSpacing="0px" VerticalPadding="0px" /> </asp:TreeView> Usually, this approach doesn t provide enough fine-tuning. Instead, you ll want to tweak a specific part of the tree. In this case, you need to find the style object that applies to the appropriate part of the tree, as explained in the following two sections.

// Another way to perform string comparisons. string word = "apple"; result = word.CompareTo("attach"); // result = -1

The TreeView allows you to individually control the styles for types of nodes for example, root nodes, nodes that contain other nodes, selected nodes, and so on. Table 14-7 lists different TreeView styles and explains what nodes they affect.

The if statement is the powerhouse of conditional logic, able to evaluate any combination of conditions and deal with multiple and different pieces of data. Here s an example with an if statement that features two conditions: if (myNumber > 10) { // Do something. } else if (myString == "hello") { // Do something. } else { // Do something. } An if block can have any number of conditions. If you test only a single condition, you don t need to include any else blocks.

Note In this example, each block is clearly identified with the { } characters. This is a requirement if you want to

Applies to all nodes. The other styles may override some or all of the details that are specified in the NodeStyle. Applies only to the first-level (root) node. Applies to any node that contains other nodes, except root nodes. Applies to any node that doesn t contain child nodes and isn t a root node. Applies to the currently selected node. Applies to the node the user is hovering over with the mouse. These settings are applied only in up-level clients that support the necessary dynamic script.

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