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While the database abstraction layer makes remembering function names easier, it also adds built-in security to queries. Sometimes, we need to connect to third-party or legacy databases, and it would be great to use Drupal s database API for this need as well and get the security benefits. The good news is that we can! For example, your module can open a connection to a non-Drupal database and retrieve data. In the settings.php file, $databases is an array composed of multiple database connection strings. Here s the default syntax, specifying a single connection: array( 'driver' => 'mysql', 'database' => 'databasename', 'username' => 'username', 'password' => 'password', 'host' => 'localhost', 'port' => 3306, 'prefix' => 'myprefix_', ); As an example, you might have two databases, the default database (in this case named D7) and a legacy database as defined here. $databases = array ( 'default' => array ( 'default' => array ( 'driver' => 'mysql', 'database' => 'd7', 'username' => 'username', 'password' => 'userpassword', 'host' => 'localhost', 'port' => '', 'prefix' => '', ), ), 'legacy' => array ( 'default' => array ( 'driver' => 'mysql', 'database' => 'legacydatabase', 'username' => 'legacyusername', 'password' => 'legacyuserpassword', 'host' => '122.185.22.1', 'port' => '6060', ), ), );

Note The IsolationLevel property of a transaction object allows you to specify how aggressively a transaction should be guarded against the activities of other parallel transactions. By default, transactions are isolated completely until committed. Consult the .NET Framework 4.0 SDK documentation for full details regarding the values of the IsolationLevel enumeration.

Beyond the members defined by the IDbTransaction interface, the SqlTransaction type defines an additional member named Save(), which allows you to define save points. This concept allows you to roll back a failed transaction up until a named point, rather than rolling back the entire transaction. Essentially, when you call Save() using a SqlTransaction object, you can specify a friendly string moniker. When you call Rollback(), you can specify this same moniker as an argument to perform an effective partial rollback. Calling Rollback() with no arguments causes all of the pending changes to be rolled back.

When you need to connect to one of the other databases in Drupal, you activate it by its key name and switch back to the default connection when finished: // Get some information from a non-Drupal database. db_set_active('legacy'); $result = db_query("SELECT * FROM ldap_user WHERE uid = :uid", array(':uid' => $user->uid)); // Switch back to the default connection when finished. db_set_active('default');

Now let s look at how you use ADO.NET transactions. Begin by using the Server Explorer of Visual Studio 2010 to add a new table named CreditRisks to the AutoLot database, which has the same exact columns as the Customers table you created earlier in this chapter: CustID, which is the primary key; FirstName; and LastName. As its name suggests, CreditRisks is where you banish the undesirable customers who fail a credit check. Assuming you have added this new table to your database diagram, you should now see the AutoLot implementation shown in Figure 21-14.

Figure 21-14. The interconnected Orders, Inventory, and Customers tables Like the earlier savings-to-checking money transfer example, this example, where you move a risky customer from the Customers table into the CreditRisks table, should occur under the watchful eye of a transactional scope (after all, you will want to remember the ID and names of those who are not creditworthy). Specifically, you need to ensure that either you successfully delete the current credit risks from the Customers table and add them to the CreditRisks table, or you need to ensure that neither of these database operations occurs.

Note In a production environment, you would not need to build a whole new database table to capture high risk customers; instead, you could add a Boolean column named IsCreditRisk to the existing Customers table. However, this new table lets you play with a simple transaction.

Caution If you switch to a different database connection and then try to do something like t( text ), it will cause an error. The t() function requires database activity, and the database connection stays switched, even outside of the code scope where you switched it. Therefore always be careful to switch the database connection back to default as soon as possible, and in particular take care that you don t call code that will in turn make database requests.