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1. Defining DataSources can be tricky in Cake. In general, a datasource (lowercase) is any source for supplying or saving data. So, MySQL is a datasource, as is an XML file or pulling data from an LDAP server. Cake s method for connecting to these datasources is through a resource file called a DataSource, which is not the same as the source of data. To provide consistency in this chapter, I ll stick with DataSource, the camel-cased word, to refer to Cake s resource file and the lowercase word, datasource, to refer to the actual source of data. Simply put, in Cake you use DataSources to connect to datasources such as MySQL, XML files, and LDAP servers.

Tip If you re a complete database novice, you can get up to speed on essential database concepts using

the video tutorials at http://msdn.microsoft.com/vstudio/express/sql/learning. There, you ll find over nine hours of instruction that describes how to use the free SQL Server 2005 Express Edition with Visual Studio. The tutorials move from absolute basics covering topics such as database data types and table relationships to more advanced subject matter such as full-text search, reporting services, and network security.

$time->dayAsSql() $time->daysAsSql() $time->format() $time->fromString() $time->gmt() $time->isThisMonth() $time->isThisWeek() $time->isThisYear()

Accessing a database in a web application is a completely different scenario than accessing a database in a typical client-server desktop application. Most developers hone their database skills in the desktop world and run into serious problems when they try to apply what they have learned with stand-alone applications in the world of the Web. Quite simply, web applications raise two new considerations: problems of scale and problems of state. Problems of scale are the problems that can result from the massively multiuser nature of the Web. A web application has the potential to be used by hundreds or thousands of simultaneous users. This means it can t be casual about using server memory or limited resources such as database connections. If you design an application that acquires a database connection and holds it for even a few extra seconds, other users may notice a definite slowdown. And if you don t carefully consider database concurrency issues (in other words, what happens when the changes from different users overlap), you can run into significant headaches, such as failed updates and inconsistent data.

Note Problems of scale can occur when developing traditional client-server desktop applications. The

Note To manually recalculate a data table later, click the data table s formula, and then press F9 (to recalculate all worksheets in all open workbooks) or press Shift+F9 (to recalculate only the active worksheet).

difference is that in most client-server applications they are far less likely to have any negative effect because the typical load (the number of simultaneous users) is dramatically lower. Database practices that might slightly hamper the performance of a client-server application can multiply rapidly and cause significant problems in a web application.

Returns a partial SQL string to search for records between two times occurring on the same day Returns a partial SQL string to search for records between two dates Returns a formatted date string; converts valid strtotime() strings or Unix timestamps Returns a Unix timestamp from a given valid strtotime() string or integer Converts a given Unix timestamp or valid strtotime() string to Greenwich mean time Returns true if given datetime string is within this month Returns true if given datetime string is within this week Returns true if given datetime string is within this year

Problems of state are problems that can result from the disconnected nature of the Internet. As you already know, HTTP is a stateless protocol. When a user requests a page in an ASP.NET application, the web server processes the code, returns the rendered HTML, and closes the connection immediately. Although users may have the illusion that they are interacting with a continuously running application, they are really just receiving a string of static pages. Because of the stateless nature of HTTP, web applications need to perform all their work in the space of a single request. The typical approach is to connect to a database, read information, display it, and then close the database connection. This approach runs into difficulties if you want the user to be able to modify the retrieved information. In this scenario, the application requires a certain amount of intelligence in order to be able to identify the original record, build a SQL statement to select it, and update it with the new values.