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inc This mechanism is shown in Figure 5-1 If you use a database that is not yet supported, you can write your own driver by implementing the wrapper functions for your database For more information, see Writing Your Own Database Driver at the end of this chapter..

If you are troubleshooting a network problem and have exhausted all the GUI facilities available to you, the ping command can help ascertain where the connection problem may be. Simply typing ping followed by an IP address or host name will send out a network packet that effectively bounces off the target system and reports whether it s working much in the same way as radar works in a submarine (where the name came from):

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In the case of the LINQ Expression examples in 2, the LINQ expression trees are data that represent code elements, such as if conditions and while loops Once code is in the form of data (ie, expression trees), we can write metaprograms that manipulate the code as data In the case of the DLR Hosting API examples, the Python and Ruby code is data Once that code is in the form of data, we can write metaprograms that manipulate the code via the DLR Hosting API Metaprograms can generate or manipulate programs at compile time or at runtime An example of a metaprogram that manipulates a program at compile time is code generation If you are a C++ programmer and you use C++ macros in your code, you are doing compile-time metaprogramming.

Drupal automatically establishes a connection to the database as part of its normal bootstrap process, so you do not need to worry about doing that. If you are working outside Drupal itself (for example, you re writing a stand-alone PHP script or have existing PHP code outside of Drupal that needs access to Drupal s database), you would use the following approach. // Make Drupal PHP's current directory. chdir('/full/path/to/your/drupal/installation'); // Bootstrap Drupal up through the database phase. include_once('./includes/bootstrap.inc'); drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);

// Now you can run queries using db_query(). $result = db_query('SELECT title FROM {node}'); ...

The result of the ping being issued is that three IP packets are sent to the target system, and then the resultant time taken for a response is reported in milliseconds. The lower the number (called the network latency), the better the connection quality. If there is no response, you ll be informed that the target system is unreachable. If you are having trouble reaching a target system, work backward from the target through each hop of the route to determine where the problem lies.

Caution Drupal is often configured to have multiple folders in the sites directory so that the site can be moved from staging to production without changing database credentials. For example, you might have sites/staging. example.com/settings.php with database credentials for your testing database server and sites/www. example.com/settings.php with database credentials for your production database server. When establishing a database connection as shown in this section, Drupal will always use sites/default/settings.php, because there is no HTTP request involved.

That s because, when you compile the C++ code, the macros are processed by the preprocessor to generate code that then gets compiled together with the rest of your code by the C++ compiler The.

pathping works much in the same way as the standard ping command works except for the subtle difference that it also reports the number and identity of the network hops used to get to the target. A hop is literally each routing stage that the IP packet has to traverse to get to its target.

Drupal s db_query() function is used to execute a SELECT query to the active database connection There are other functions for performing INSERTS, UPDATES, and DELETES, and I ll cover those in a moment, but first let s look at extracting information from the database There is some Drupal-specific syntax you need to know when it comes to writing SQL statements First, table names are enclosed within curly brackets so that table names can be prefixed to give them unique names, if necessary This convention allows users who are restricted by their hosting provider in the number of databases they can create to install Drupal within an existing database and avoid table name collisions by specifying a database prefix in their settingsphp file.

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