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If the username begins with dave and this is the first time this user has logged in, a row in the users table does not exist for this user, so one will be created. However, no e-mail address has been provided like it was for Drupal s default local user registration, so a module this simple is not a real solution if your site relies on sending e-mail to users. You ll want to set the mail column of the users table so you will have an e-mail address associated with the user. To do this, you can have your module respond to the insert operation of the user hook, which is fired whenever a new user is inserted: /** * Implements hook_user_insert(). */ function authdave_user_insert(&$edit, &$account, $category = NULL) { global $authdave_authenticated; if ($authdave_authenticated) { $email = mycompany_email_lookup($account->name); // Set e-mail address in the users table for this user. db_update('users') ->fields( array( 'mail' => $email, ) ) ->condition('uid', $account->uid) ->execute(); } } Savvy readers will notice that there is no way for the code to tell whether the user is locally or externally authenticated, so we ve cleverly saved a global variable indicating that our module did authentication. We could also have queried the authmap table like so: db_query("SELECT uid FROM {authmap} WHERE uid = :uid AND module = :module", $account->uid, 'module' => 'authdave'); array(':uid' =>

The next step is to add new functionality to the data access library assembly (AutoLotDAL.dll) you created in 21. Begin by creating a simple example that fills a DataSet with a single table using an ADO.NET data adapter object. Create a new Console Application named FillDataSetUsingSqlDataAdapter and import the System.Data and System.Data.SqlClient namespaces into your initial C# code file. Now update your

Main() method as follows (you might need to change the connection string, based on how you created the AutoLot database in the previous chapter): static void Main(string[] args) { Console.WriteLine("***** Fun with Data Adapters *****\n"); // Hard-coded connection string. string cnStr = "Integrated Security = SSPI;Initial Catalog=AutoLot;" + @"Data Source=(local)\SQLEXPRESS"; // Caller creates the DataSet object. DataSet ds = new DataSet("AutoLot"); // Inform adapter of the Select command text and connection string. SqlDataAdapter dAdapt = new SqlDataAdapter("Select * From Inventory", cnStr); // Fill our DataSet with a new table, named Inventory. dAdapt.Fill(ds, "Inventory"); // Display contents of DataSet. PrintDataSet(ds); Console.ReadLine(); } Notice that you construct the data adapter by specifying a string literal that will map to the SQL Select statement. You will use this value to build a command object internally, which you can obtain later using the SelectCommand property. Next, notice that it is the job of the caller to create an instance of the DataSet type, which is passed into the Fill() method. Optionally, you can pass the Fill() method as a second argument a string name that you use to set the TableName property of the new DataTable (if you do not specify a table name, the data adapter will simply name the table, Table). In most cases, the name you assign a DataTable will be identical to the name of the physical table in the relational database; however, this is not required.

All users who were added via external authentication will have a row in the authmap table as well as the users table. However, in this case the authentication and hook_user_insert run during the same request, so a global variable is a good alternative to a database query.

Note The Fill() method returns an integer that represents the number of rows returned by the SQL query.

Finally, notice that you do not explicitly open or close the connection to the database anywhere in the Main() method. You preprogram the Fill() method of a given data adapter to open and then close the underlying connection before returning from the Fill() method. Therefore, when you pass the DataSet to the PrintDataSet() method (implemented earlier in this chapter), you are operating on a local copy of disconnected data, incurring no round-trips to fetch the data.

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