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Rather than constructing a SQL query at runtime and passing it to the database to be executed, you can instead use parameters to modify a fixed SQL query. This example will use that methodology to replicate the functionality you saw in the previous example. Follow these steps: 1. Open Select.aspx from the root of the 04 Web site and switch to the Source view of the page. 2. In the DropDownList1_SelectedIndexChanged event, replace the code that creates the SQL query to be executed with the following: string strCommandText = "SELECT Player.PlayerName, Manufacturer.ManufacturerName FROM Player INNER JOIN Manufacturer ON Player.PlayerManufacturerID = Manufacturer.ManufacturerID WHERE @ManufacturerID = 0 OR Player.PlayerManufacturerID = @ManufacturerID ORDER BY Player.PlayerName"; 3. Remove the existing lines of code that add the filter and the ordering to strCommandText. 4. Add the following code before the call to open the database: // add the parameter SqlParameter myParameter = new SqlParameter(); myParameter.ParameterName = "@ManufacturerID"; myParameter.SqlDbType = SqlDbType.Int; myParameter.Value = DropDownList1.SelectedValue; myCommand.Parameters.Add(myParameter); 5. Execute the page. You ll see that the page performs exactly as you would expect, with the list of Players filtered correctly according to the Manufacturer that is selected.

omponent-based programming is a simple, elegant idea. When used properly, it allows your code to be more organized, consistent, and reusable. It s also incredibly easy to implement in a .NET application, because you never need to use the Windows registry or perform any special configuration. A component, at its simplest, is one or more classes that are compiled into a separate DLL assembly file. These classes provide some unit of logically related functionality. You can access a component in a single application, or you can share the component between multiple applications. Your web pages (or any other .NET application) can use the classes in your components in the same way they use any other .NET class. Best of all, your component is encapsulated, which means it provides exactly the features your code requires and hides all the other messy details. When combined with careful organization, component-based programming is the basis of good ASP .NET application design. In this chapter, you ll examine how you can create components (and why you should) and consider examples that show you how to encapsulate database functionality with a well-written business object. You ll also learn how to bind your database component to the web controls on a page using the ObjectDataSource.

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The Zend Framework is an open-source library of PHP 5 components that can be used to solve tasks that commonly arise in everyday web development. It is actively contributed to by a large number of developers, and it is backed by Zend (the company that writes the Zend Engine, which has powered PHP since PHP 4). We will be using this framework in our application, as it allows us to focus on developing a Web 2.0 application, rather than getting bogged down in the details of building an entire application infrastructure. These are some of the components we will be using: Zend_Auth and Zend_Acl: Used to authenticate users when they try to log in and to check their permissions (see 3) Zend_Controller: Used to handle client requests and direct the requests to the appropriate classes (see later this chapter) Zend_Db: Used to interact with the application MySQL database Zend_Mail: Used to send e-mails to users Zend_Validate and Zend_Filter: Used to check and sanitize user-submitted data in forms Zend_Search: Used for full-text searching We will use more components, but, as you can see, we will be making heavy use of the framework. Download the Zend Framework from http://framework.zend.com. In this book, I used version 1.0.2, but you should use the most up-to-date version available. Use these commands to extract the library to the include directory: # cd /var/www/phpweb20 # wget http://framework.zend.com/releases/ZendFramework-1.0.2/ ZendFramework-1.0.2.tar.gz # tar -zxf ZendFramework-1.0.2.tar.gz # mv ZendFramework-1.0.2/library/Zend include The last command moves the actual library files from the extracted archive into the application directory. The additional files in the archive include documentation and unit testing and are not really required. You may wish to remove the downloaded files once you have installed the framework, as they are no longer needed.

All that you ve changed is the query used to select the Players from the database. Rather than having a query constructed at runtime, you have a complete query that you modify using a parameter. As you saw in 3, parameters are the means whereby you can pass information into a query at runtime without making any changes to the query itself. The query that you re using is the same query that you had for the filtering example in 3. That query used a parameter called @ManufacturerID to allow the Manufacturer to be specified by the user s selection:

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