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Figure 14-9. Testing your connection Here s the code with basic error handling: // Define the ADO.NET Connection object. string connectionString = WebConfigurationManager.ConnectionStrings["Pubs"].ConnectionString; SqlConnection myConnection = new SqlConnection(connectionString); try { // Try to open the connection.

square brackets: $var = '['. $var .']'; .

myConnectionOpen(); lblInfoText = "<b>Server Version:</b> " + myConnectionServerVersion; lblInfoText += "<br /><b>Connection Is:</b> " + myConnectionStateToString(); } catch (Exception err) { // Handle an error by displaying the information lblInfoText = "Error reading the database "; lblInfoText += errMessage; } finally { // Either way, make sure the connection is properly closed // (Even if the connection wasn't opened successfully, // calling Close() won't cause an error) myConnectionClose(); lblInfoText += "<br /><b>Now Connection Is:</b> "; lblInfoText += myConnectionStateToString(); } Once you use the Open() method, you have a live connection to your database One of the most fundamental principles of data access code is that you should reduce the amount of time you hold a connection open as much as possible.

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As an ASP.NET developer, you may have the responsibility of creating the database required for a web application. Alternatively, it may already exist, or it may be the responsibility of a dedicated database administrator. If you re using a full version of SQL Server, you ll probably use a graphical tool such as SQL Server Management Studio to create and manage your databases.

Imagine that as soon as you open the connection, you have a live, ticking time bomb You need to get in, retrieve your data, and throw the connection away as quickly as possible in order to ensure your site runs efficiently Closing a connection is just as easy, as shown here: myConnectionClose(); Another approach is to use the using statement The using statement declares that you are using a disposable object for a short period of time As soon as you finish using that object and the using block ends, the common language runtime will release it immediately by calling the Dispose() method Here s the basic structure of the using block: using (object) { .. } It just so happens that calling the Dispose() method of a connection object is equivalent to calling Close() and then discarding the connection object from memory.

Tip SQL Server Express doesn t include SQL Server Management Studio in the download that you use to

That means you can shorten your database code with the help of a using block The best part is that you don t need to write a finally block the using statement releases the object you re using even if you exit the block as the result of an unhandled exception Here s how you could rewrite the earlier example with a using block: // Define the ADONET Connection object string connectionString = WebConfigurationManagerConnectionStrings["Pubs"]ConnectionString; SqlConnection myConnection = new SqlConnection(connectionString); try {.

install it. However, you can download it separately. Just search for SQL Server Management Studio in your favorite search engine or surf to http://tinyurl.com/ynl9tv.

using (myConnection) { // Try to open the connection. myConnection.Open(); lblInfo.Text = "<b>Server Version:</b> " + myConnection.ServerVersion; lblInfo.Text += "<br /><b>Connection Is:</b> " + myConnection.State.ToString(); } } catch (Exception { // Handle an lblInfo.Text lblInfo.Text } err) error by displaying the information. = "Error reading the database. "; += err.Message;

The usage of these functions is straightforward, as demonstrated in Listing 18-1. Listing 18-1. JSON Encoding/Decoding $original = array('key'=>'value', 'key2'=>'value2'); $json = json_encode($original); $restored = json_decode($json, true); print_r($original); print "\n" . $json ."\n\n"; print_r($restored); Array ( [key] => value [key2] => value2 ) {"key":"value","key2":"value2"} Array ( [key] => value [key2] => value2 )

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