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Accessing a database in a web application is a completely different scenario than accessing a database in a typical client-server desktop application. Most developers hone their database skills in the desktop world and run into serious problems when they try to apply what they have learned with stand-alone applications in the world of the Web. Quite simply, web applications raise two new considerations: problems of scale and problems of state. Problems of scale are the problems that can result from the massively multiuser nature of the Web. A web application has the potential to be used by hundreds or thousands of simultaneous users. This means it can t be casual about using server memory or limited resources such as database connections. If you design an application that acquires a database connection and holds it for even a few extra seconds, other users may notice a definite slowdown. And if you don t carefully consider database concurrency issues (in other words, what happens when the changes from different users overlap), you can run into significant headaches, such as failed updates and inconsistent data.

require 'active_record' ActiveRecord::Base.establish_connection( :adapter => 'mysql', :host => 'localhost', :username => 'your_mysql_username_goes_here', :password => 'your_mysql_password_goes_here' :database => 'players')

s Note Problems of scale can occur when developing traditional client-server desktop applications. The difference is that in most client-server applications they are far less likely to have any negative effect because the typical load (the number of simultaneous users) is dramatically lower. Database practices that might slightly hamper the performance of a client-server application can multiply rapidly and cause significant problems in a web application.

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Problems of state are problems that can result from the disconnected nature of the Internet. As you already know, HTTP is a stateless protocol. When a user requests a page in an ASP.NET application, the web server processes the code, returns the rendered HTML, and closes the connection immediately. Although users may have the illusion that they are interacting with a continuously running application, they are really just receiving a string of static pages. , Because of the stateless nature of HTTP web applications need to perform all their work in the space of a single request. The typical approach is to connect to a database, read

Player.delete_all Player.new do |p| p.name = "Matthew 'm_giff' Gifford" p.salary = 89000.00 p.wins = 11 p.save end Player.new do |p| p.name = "Matthew 'Iron Helix' Bouley" p.salary = 75000.00 p.wins = 4 p.save end

All of these examples were simple enough that writing them without the aid of a visual development environment was not a challenge. However, JSF was specifically designed with tool support in mind, and on any decent-sized production application, this can greatly improve developer productivity. For example, using tools like Oracle JDeveloper and Java Studio Creator, you can graphically lay out the page by using a palette of available components (see Figure 8-11). We can just drag and drop our way to an application (see Figure 8-12). We can also graphically define our navigation (see Figure 8-13). It is widely expected that developers will use tools like Java Studio Creator to simplify the development process.

information, display it, and then close the database connection. This approach runs into difficulties if you want the user to be able to modify the retrieved information. In this scenario, the application requires a certain amount of intelligence in order to be able to identify the original record, build a SQL statement to select it, and update it with the new values. Fortunately, both ASP .NET and ADO.NET are designed with these challenges in mind. As you work your way through this chapter (and the following two chapters), you ll learn how to deal with databases safely and efficiently.

Before you can run any data access code, you need a database server to take your command. Although there are dozens of good options, all of which work equally well with ADO.NET (and require essentially the same code), a significant majority of ASP.NET applications use Microsoft SQL Server. This chapter includes code that works with SQL Server 7 or later, although you can easily adapt the code to work with other database products. Ideally you ll use SQL Server 2005 (with Service Pack 2) or SQL Server 2008. Microsoft is phasing out older versions, and they don t have support for Windows Vista and Windows Server 2008. If you don t have a full version of SQL Server, there s no need to worry you can simply install the free SQL Server Express Edition (as described in the next section). It includes all the database features you need to develop and test a web application.

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