Preparing the Compliments Canvas Pages in Java

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Preparing the Compliments Canvas Pages
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IFrames that use the Facebook JavaScript Client Library can receive results of preloaded FQL queries and get cached access to the user s friend list that is not passed to the canvas page by defaultThis helps IFrames catch up with some of FBML s speed advantages
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Testing
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Because all FBML must be rendered by Facebook before it is displayed, it can be more difficult to test Either you copy what you expect the FBML to be to the FBML Test Console or you have to access your page through Facebook IFrame testing can be much simpler:You can access your page directly on your local server Of course, in those cases, you might have to emulate the GET variables that Facebook passes to IFrame pages to allow your application to function normally
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Preparing the Compliments Canvas Pages
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The Compliments application s canvas page allows the user to send a compliment to one of his friendsWe create it first in FBML and then as an IFrame; this way, we can go through how each type worksAt the end, we add a tab control that lets users navigate between the pages For ease of reading, we use Compliments as the application name in the Canvas Callback URL, but you should substitute your own application name Before we create the canvas pages, we need to do a little preparation: set up the database, add some utility functions, create an external CSS file, and handle versioning for external files
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Database Setup
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We created the Compliments database in 6 For this chapter, we just need one table to store information about the compliments that users sendWe need to keep the Facebook user ID for the person sending the compliment, the Facebook user ID for the person he is sending it to, and the type, text, and time of the compliment Use the create statement in Listing 71 to build the table
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Listing 71 Database Table Create Statement
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CREATE TABLE 'compliments''compliments' ( 'appUserID' int(10) unsigned NOT NULL, 'targetID' int(10) unsigned NOT NULL, 'category' varchar(45) COLLATE utf8_unicode_ci NOT NULL, 'compliment' varchar(300) COLLATE utf8_unicode_ci NOT NULL, 'complimentTime' datetime NOT NULL, PRIMARY KEY ('appUserID','targetID','complimentTime') ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
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We need to update globalsinc with information about the database server, database, and the user login and password that we created in 6Add the contents of Listing 72 to the end of globalsinc before the closing >
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7 Building the Canvas
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Listing 72
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globalsinc: Database Constants
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// IP or URL of the MySQL database server define('FB_DB_SERVER', '<your db server>'); // the database schema used for the application define('FB_DB_SCHEMA', 'compliments'); // database user define('FB_DB_USER', '<db user>'); // database password define('FB_DB_PASS', '<db_password>');
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We use a simple database wrapper class that will handle connections, data translation, and diagnosticsAdd the source in Listing 73 into a new file called dbinc in the inc directoryThe key things to notice about the DB class is that it automatically creates and destroys database connections with the scope of each instanceAll queries go through execQuery() that will put any failures into the error log Finally, addCompliment() is the function we use to store the compliment values in the database as they are sent
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Listing 73 dbinc: Database Access Class
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< php class DB extends mysqli { /** Construct - create connection to db */ public function __construct() { parent::__construct(FB_DB_SERVER, FB_DB_USER, FB_DB_PASS, FB_DB_SCHEMA); if ($this->connect_error) { die('Connect Error (' $this->connect_errno ') ' $this->connect_error); } } /** Destructor - closes connection to db **/ function __destruct() { parent::close(); } /** Executes a query and logs errors **/ private function _execQuery($query) { $result = $this->query($query); if (!$result) { die("<br/>INVALID query: '" $this->error "' => $query<br/>"); } return $result; }
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Preparing the Compliments Canvas Pages
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Listing 73
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Continued
/** Adds a compliment into the database **/ function addCompliment($appUserID, $targetID, $category, $compliment) { $appUserID = $this->real_escape_string($appUserID); $category = $this->real_escape_string($category); $targetID = $this->real_escape_string($targetID); $compliment = $this->real_escape_string(htmlspecialchars($compliment)); $query = "INSERT INTO compliments ( appUserID, targetID, category, compliment, complimentTime ) VALUES ( $appUserID, $targetID, '$category', '$compliment', NOW() )"; $result = $this->_execQuery($query); } } >