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The World Wide Web, built from simple low-cost servers and universal clients, has revolutionized computing. Not so long ago, the very concept of a common global information network was unthinkable. In fact, even Microsoft was unconvinced that Web technology would ever mature successfully. Originally, The Microsoft Network (MSN) was constructed with proprietary technology, modeled after similar networks such as CompuServe and Prodigy. To connect to these networks, you had to install proprietary software on your machine. Today, the concept of living without the Web is just as unthinkable, and all the formerly proprietary networks (including MSN) have spent millions of dollars to convert their networks to the universal access offered by the Web. Although MSN, CompuServe, and Prodigy all still offer specialized programs that you can install to enhance your experience as a member of any of the networks, all these programs are merely customized versions of your Web browser. You can also log on to these networks with a standard Web browser. Database applications were among the last to appear on the Web, but today they are arguably the fastest growing type of Web application. The prospect of distributing data to or collecting it from literally a world of clients, working on disparate computers and operating systems, and not requiring software distribution other than the ubiquitous browser, is simply too compelling to resist for long. Microsoft Access doesn t provide a complete Web development environment. However, it does provide useful tools for developing a variety of Web database applications. This chapter explores the Web, explains how the Web capabilities of Access work, and provides pointers to other tools in case Access doesn t satisfy all your needs. This chapter serves as an introduction to topics that will be covered in detail in the next few chapters.

Summary

Designing and developing Web applications requires a different set of tools, a different approach, and a different mindset than performing the same tasks solely in Access. A properly designed Web application can offer significant improvements over typical desktop applications in timeliness (frequency of update and reporting), interactivity (degree of user control), and partitioning (distributed location of application components).

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Microsoft Office Access 2003 Inside Out With each new version of development environments, software companies provide improved tools that allow developers to more easily deliver desktop and Web solutions. Some of these tools allow developers to create desktop and Web applications that work with each other. However, there is quite a leap between desktop application development, such as Access, and Web application development. Before you begin to explore ways to create Web applications, you first need to become familiar with a couple of key underlying technologies HTML (Hypertext Markup Language) and XML (Extensible Markup Language).

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Web pages are simple text files containing a mix of textual content and codes that your browser interprets when it loads the Web page The codes (called tags) that your browser understands are part of an international language specification called Hypertext Markup Language (HTML) The basic specification is documented by ISO (short for International Organization for Standardization) standard ISO/IEC 15445:2000 However, the standard that most software vendors implement is an enhanced version created and published by the World Wide Web Consortium (W3C), which is made up of representatives from major software vendors around the world (You can visit the W3C Web site at http://wwww3org) Actually, HTML isn t a programming language it s a descriptive language that defines objects on your Web page These objects can have properties, methods, and events similar to many of the objects you find in Microsoft Access.

On the surface, LINQ to SQL allows for easy access to querying and updating abilities without the need to manually define the database access. Under the covers, it offers a powerful set of mapping structures, expression parsing, and entity management. You can use the technology without fully understanding how everything works under the covers. The more you understand how it works, the less likely you are to find yourself experiencing unexpected results. If nothing else, it is important to understand how the DataContext manages the object identity and change management so that you make sure you update the correct information. At this point, we ve covered the core concepts behind LINQ to SQL and pulled back the covers to get an understanding of how it works. In the next chapter, we ll continue to examine LINQ to SQL by exploring some more advanced functionality. By the time we re done, you should have a full tool belt for using LINQ with the SQL Server family of databases.

You can include procedural code (known as a script) in your Web page definition that responds to events The two most common scripting languages are VBScript a second cousin to the Visual Basic you use in Access and JavaScript, a language invented by Sun Microsystems Most Web page developers use an HTML editor (such as Microsoft FrontPage) to create Web pages A good editor hides the actual coding and allows the developer to create pages in much the same way that you create Access forms or reports by providing a what-you-seeis-what-you-get (WYSIWYG) interface However, most developers at one time or another must dig into the HTML to do some custom work In 27, Building Data Access Pages, you ll go into the coding behind an Access data access page to enhance the page with VBScript, so learning the basics about HTML now will be useful to you later.

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