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On their own, the data classes can t accomplish much. Technically, you could create data objects by hand, build tables and rows in your code, and fill them with information. But in most cases, the information you need is located in a data source such as a relational database. To access this information, extract it, and insert it into the appropriate data objects, you need the data provider classes described in this section. Remember, each one of these classes has a database-specific implementation. That means you use a different, but essentially equivalent, object depending on whether you re interacting with SQL Server, Oracle, or any other ADO.NET provider. Regardless of which provider you use, your code will look almost the same. Often the only differences will be the namespace that s used and the name of the ADO.NET data access classes (as listed in Table 15-3).

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Log4js Example</title> <script type="text/javascript" src="js/log4js.js"></script> <script type="text/javascript" src="js/log4jsExample.js"></script> </head> <body> <p> Add Two Integers: <input type="text" id="addOne" size="4"/> + <input type="text" id="addTwo" size="4"/> = <input type="text" id="result" size="10" disabled="disabled"/> <button value="Calculate" onclick="calculateSum();"> Calculate </button> </p> </body> </html>

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Each provider designates its own prefix for naming classes. Thus, the SQL Server provider includes SqlConnection and SqlCommand classes, and the Oracle provider includes OracleConnection and OracleCommand classes. Internally, these classes work quite differently, because they need to connect to different databases using different low-level protocols. Externally, however, these classes look quite similar and provide an identical set of basic methods because they implement the same common interfaces. This means your application is shielded from the complexity of different standards and can use the SQL Server provider in the same way the Oracle provider uses it. In fact, you can often translate a block of code for interacting with a SQL Server database into a block of Oracle-specific code just by editing the class names in your code. Table 15-3. The ADO.NET Data Provider Classes

Many web frameworks and languages are available. Of course, since you bought this book, it s likely you re interested in Ruby web frameworks, and probably Ruby on Rails (typically referred to as simply Rails) in particular. In fact, Ruby itself has grown dramatically due to Rails meteoric rise to prominence. (Incidentally, Active Record, which you ve used in previous chapters, is part of Rails.) However, you can use other Ruby web frameworks. Nitro (http://www.nitroproject. org/), for example, is a powerful alternative. Another is Merb (http://merb.rubyforge.org/), which is a framework similar to Rails, but with a much smaller footprint. Merb also lets you use alternate ORM frameworks, like Data Mapper, so it s more flexible. Due to Rails popularity and widespread community support, it s the framework you ll use for the web examples in this book. Rails, like Nitro and Merb, is a Model-ViewController (MVC) framework. Following the MVC pattern, code is generally divided into three parts:

Remember, though the underlying technical details differ, the classes are almost identical. The only real differences are as follows: The names of the Connection, Command, DataReader, and DataAdapter classes are different in order to help you distinguish them. The connection string (the information you use to connect to the database) differs depending on what data source you re using, where it s located, and what type of security you re using. Occasionally, a provider may choose to add features, such as methods for specific features or classes to represent specific data types. For example, the SQL Server Command class includes a method for executing XML queries that aren t part of the SQL standard. In this chapter, you ll focus on the standard functionality, which is shared by all providers and used for the majority of data access operations. In the rest of this chapter, you ll consider how to write web page code that uses these objects. First, you ll consider the most straightforward approach direct data access. Then, you ll consider disconnected data access, which allows you to retrieve data in the DataSet and cache it for longer periods of time. Both approaches complement each other, and in most web applications you ll use a combination of the two.

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