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ASP.NET 2.0 is Microsoft s latest technology set for building dynamic, interactive web content. Compared to its previous versions, ASP.NET 2.0 includes many new features aimed at increasing the web developer s productivity in building web applications. Because this book is targeted at both existing ASP.NET 1.1 and existing ASP.NET 2.0 developers, we ll highlight a number of ASP.NET 2.0-specific techniques along the way and try to provide useful tips and tricks that increase your coding efficiency by making the most of this technology. However, do keep in mind that while building your e-commerce web site with this book, we only cover a subset of the vast number of features ASP.NET 2.0 has to offer. Therefore, you still need additional ASP.NET 2.0 books (or other resources) to use as a reference and to complete your knowledge on theory issues that didn t make it into this book. In the Apress technology tree, reading this book comes naturally after Beginning ASP.NET 2.0 in C#: From Novice to Professional (Apress, 2005), but you can always use the beginners books of your choice instead. ASP.NET is not the only server-side technology around for creating professional e-commerce web sites. Among its most popular competitors are PHP (Hypertext Preprocessor), JSP (JavaServer Pages), ColdFusion, and even the outdated ASP 3.0 and CGI (Common Gateway Interface). Among these technologies are many differences, but also some fundamental similarities. For example, pages written with any of these technologies are composed of basic HTML, which draws the static part of the page (the template), and code that generates the dynamic part.

< xml version="1.0" encoding="utf-8" > <resources> <string name="app_name">StringsDemo</string> <string name="btn_name">Name:</string> <string name="funky_format">My name is <b>%1$s</b></string> </resources>

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In the following exercise, you ll quickly implement a simple shopping cart administration page, where the administrator can see how many old shopping cart entries exist and can delete them if necessary. The most interesting aspect you need to understand is the logic behind the database stored procedure that calculates the records that need to be deleted. The goal is to delete all shopping carts that haven t been updated in a certain amount of time. This isn t as simple as it sounds at first sight, you might think all you have to do is delete all the records in ShoppingCart whose DateAdded value is older than a specified date. However, this strategy doesn t work with shopping carts that are modified over time (say, the visitor has been adding items to the cart each week in the past three months). If the last change to the shopping cart is recent, none of its elements should be deleted, even if some are very old. In other words, you should either remove all elements in a shopping cart or none of them. The age of a shopping cart is given by the age of its most recently modified or added product.

The app_name resource is automatically created by the activityCreator script. The btn_name string is the caption of the Button, while our styled string format is in funky_format. Finally, to hook all this together, we need a pinch of Java:

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For the shopping cart admin page, you ll build two stored procedures (ShoppingCart RemoveOldCarts and ShoppingCartCountOldCarts), but they both work using the same logic to calculate the shopping cart elements that are old and should be removed. First, you should learn a little bit about the SQL logic that retrieves the old shopping cart elements. Take a look at the following query, which returns how many days have passed since the day the last cart item was added or modified for each cart ID: SELECT CartID, MIN(DATEDIFF(dd,DateAdded,GETDATE())) as DaysFromMostRecentRecord FROM ShoppingCart GROUP BY CartID The DATEDIFF function returns the difference, in days (because of the dd parameter), between the date specified by DateAdded and the current date (specified by GETDATE). GROUP BY groups the results by CartID, and for each CartID, the MIN aggregate function calculates the most recent record. To select all the elements from the carts that haven t been modified in the past ten days, you need a query like this: SELECT CartID FROM ShoppingCart GROUP BY CartID HAVING MIN(DATEDIFF(dd,DateAdded,GETDATE())) >= 10 You ll implement the shopping cart administration page in the next exercise. You ll implement everything, starting from the stored procedures and finishing with the presentation tier, in a single exercise.

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