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ost applications use some form of data store, with the application itself being a means to store, retrieve, manipulate, and view data. These applications might use a SQL Server 2005 database, a storage area network, or even a simple XML file. Web applications are no exception, and typically these applications are termed data-driven applications. When it comes to retrieving and representing data, a myriad of options are available; over time, the technology has evolved dramatically. The reason for this is that the code needed to access data and the engines that run the data itself tend to be resource heavy, and in situations such as on the Web where they may be used in clustered environments (i.e., the same application running on a number of machines) and serving millions of users, they can be expensive to maintain. As a result, the technology that developers use to create data-driven applications has evolved rapidly, driven by the needs of scaling to large audiences. .NET provides a data programming technology for you to use in your applications. It is called ADO.NET. It consists of a number of managed classes that enable your applications to connect to data sources, execute commands, and manage disconnected data. In this chapter, you ll look at the architecture of ADO.NET and how it works to bring data to your application. You ll look into the SQL Server 2005 Express edition, a free version of the industryleading enterprise database software from Microsoft, as well as a sample database, AdventureWorks, that is used to demonstrate many of its features. You ll wrap the chapter up with a tour through some of the server controls that can be used to provide data awareness to your web application through data binding.

The part that confuses most people about using cron for your Drupal installation is that the cron program is responsible only for the scheduling. You need a second program to actually call the cron.php file. wget, lynx, and curl are three candidates for this second program, and you are free to choose which one works best for you. You need to configure the program to call the URL of the cron.php file via HTTP It is important to allow the web server to handle the . request instead of calling cron.php from the PHP command line, because the web server provides key information, such as the host name, that will otherwise be missing. The easiest tool for sending an HTTP request to cron.php is wget (http://www.gnu.org/ software/wget/wget.html). To find out if you have wget available, issue the following command: # whereis wget If it is installed, you will see a line like this: wget: /usr/bin/wget You can test that you have permissions to use it by issuing a command like this: # wget -S --spider drupal.org -S tells wget to print the output to the console, and --spider tells wget not to retrieve the response, just the headers. The result should look like this: # wget -S --spider drupal.org --16:53:14-- http://drupal.org/ => `index.html' Resolving drupal.org... 217.67.229.126 Connecting to drupal.org|217.67.229.126|:80... connected. HTTP request sent, awaiting response... HTTP/1.1 200 OK [...] If you have gotten this far, wget is the best tool for you. You will most likely be able to use cron and wget to access cron.php in your Drupal installation. Here is the command to use to have wget call cron.php in the appropriate way: /usr/bin/wget -q -O /dev/null http://www.yoursite.com/cron.php

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The /usr/bin/wget part needs to be modified to match what was returned by the whereis wget command The -q flag tells wget to be quiet (not to output its activities and status) The -O flag tells it to send whatever headers and output come from the web site to the destination that follows In this case, the destination is /dev/null, which means the output will be discarded Finally comes the correct URL to your cronphp file Test the command in your shell, and then confirm from your Watchdog logs (Drupal path admin) that cronphp has actually run If all is well, you will see the message Cron run completed If you haven t had any success with wget, you can explore using the cron-lynxsh or cron-curlsh scripts in your Drupal s scripts directory These depend on the lynx and curl programs, respectively Refer to Drupal.

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