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large number of computer applications both desktop and web applications are data-driven. These applications are largely concerned with retrieving, displaying, and modifying data. Retrieving and processing data seems like a fairly straightforward task, but over the past decade the way applications use data has changed repeatedly. Developers have moved from simple client applications that use local databases to distributed systems that rely on centralized databases on dedicated servers. At the same time, data access technologies have evolved. If you ve worked with Microsoft languages for some time, you ve most likely heard of (and possibly used) an alphabet soup of data access technologies that includes ODBC, DAO, RDO, RDS, and ADO. The .NET Framework includes its own data access technology, ADO.NET. ADO. NET consists of managed classes that allow .NET applications to connect to data sources (usually relational databases), execute commands, and manage disconnected data. The small miracle of ADO.NET is that it allows you to write more or less the same data access code in web applications that you write for client-server desktop applications, or even single-user applications that connect to a local database. This chapter describes the architecture of ADO.NET and the ADO.NET data providers. You ll learn about ADO.NET basics such as opening a connection, executing a SQL statement or stored procedure, and retrieving the results of a query. You ll also learn how to prevent SQL injection attacks and use transactions.

ASP.NET includes a new data binding framework that can hide the underlying ADO.NET plumbing in your web pages. You can skip to 9 to start learning about these features right away. However, to build truly scalable high-performance web applications, you ll need to write custom database code (and your own database components). That means you ll need a thorough understanding of the concepts presented in this chapter.

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By default, Django ships with , which, as the name implies, stores files on the local filesystem Typically this means the server s hard drive, but there are many ways to map other types of filesystems to local paths, so there are already a number of possibilities There are even more storage options available, though, and there are plenty of ways to customize how even the existing options behave By subclassing , it s possible to make available a number of other options There are a number of things a storage system must provide, starting with most of these methods One of those methods, , doesn t strictly need to be supplied by the new storage class, since its default implementation is suitable for many situations; overriding it is a matter of preference, not requirement.

If you re a seasoned .NET 1.x programmer, you re probably wondering what s new in the latest iteration of ADO.NET. Without a doubt, the greatest change for ASP.NET applications is the new data binding model (described in s 9 and 10). The data binding model allows you to reduce the amount of code you write for data display, and it can even allow you avoid writing any data access code at all (if you re willing to pay the price with pages that are less flexible and more difficult to optimize). Even with the advent of the new data binding model, the underlying ADO.NET reality doesn t change that much. Many of the changes are internal (such as a more compact DataSet serialization format that requires less memory) or involve frills that aren t of much use in the average web application (such as the new SQL bulk copy feature for rapidly transferring an entire table between two database servers). Several more features were cut during the .NET 2.0 beta cycle (such as built-in paging support for getting part of the results of a query, the ObjectSpaces system for relational

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