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While design of any kind is somewhat in the eye of the beholder and subject to a person s own preference for doing things a certain way, it s good to know that database designs won t vary

These values can then be accessed from any of your PHP scripts in the $_SERVER variable. For example, to retrieve the config filename, you can use $_SERVER['APP_CONFIG_FILE']. Listing 14-20 shows the changes we make to the web server configuration we created in 2 (Listing 2-1). These changes go in the /var/www/phpweb20/httpd.conf file. You will need to restart your web server for these values to take effect. Listing 14-20. Setting the Settings Filename and Section in the Apache Configuration (httpd.conf) <VirtualHost 192.168.0.80> ServerName phpweb20 DocumentRoot /var/www/phpweb20/htdocs <Directory /var/www/phpweb20/htdocs> AllowOverride All Options All </Directory> php_value include_path .:/var/www/phpweb20/include:/usr/local/lib/pear

"; } } Figure 16-15 shows the result you ll get if you run two copies of this page in two separate browser windows, begin editing in both of them, and then try to commit both updates..

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Figure 16-15. A concurrency error in action Matching every field is an acceptable approach for small records, but it isn t the most efficient strategy if you have tables with huge amounts of data. In this situation, you have two possible solutions: you can match some of the fields (leaving out the ones with really big values) or you can add a timestamp field to your database table, and use that for concurrency checking. Timestamps are special fields that the database uses to keep track of the state of a record. Whenever any change is made to a record, the database engine updates the timestamp field, giving it a new, automatically generated value. The purpose of a timestamp field is to make strict concurrency checking easier. When you attempt to perform an update to a table that includes a timestamp field, you use a Where clause that matches the appropriate unique ID value (like ProductID) and the timestamp field: UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, UnitsInStock=@UnitsInStock, UnitsOnOrder=@UnitsOnOrder, ReorderLevel=@ReorderLevel, Discontinued=@Discontinued WHERE ProductID=@ProductID AND RowTimestamp=@RowTimestamp" The database engine uses the ProductID to look up the matching record. Then, it attempts to match the timestamp in order to update the record. If the timestamp matches, you know the record hasn t been changed. The actual value of the timestamp isn t important, because that s controlled by the database. You just need to know whether it s changed. Creating a timestamp is easy. In SQL Server, you create a timestamp field using the timestamp data type. In other database products, timestamps are sometimes called row versions.

that much among architects given the same list of requirements. The design of an application s class structure, on the other hand, can be much more divergent. Not only must you marry functionality to pages, you must also see that the classes you design reflect the database design you ve just achieved and obey the second software tenet. For those of you who missed it earlier, this means that to make the Web site as quick to implement, easy to debug and maintain, and straightforward to upgrade as possible, you need to divide the tasks of the Web site into clearly defined sections that you can then map to namespaces and classes. So, for example, you can split such easy-to-define sections of a Web site as forums, polls, shopping carts, product browsing, and so on. However, it isn t so obvious how to split potential namespaces into individual classes. Fortunately, a great deal of practice and trial and error by a great many people have shown that you can think of a Web site (and indeed most applications) as split across several tiers.

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