refactoring database and connector classes.

system/db.php

@@ -7,10 +7,13 @@ class DB {
 	 *
 	 * @var array
 	 */
-	private static $connections = array();
+	public static $connections = array();
 
 	/**
-	 * Get a database connection. Database connections are managed as singletons.
+	 * Get a database connection. If no database name is specified, the default
+	 * connection will be returned as defined in the db configuration file.
+	 *
+	 * Note: Database connections are managed as singletons.
 	 *
 	 * @param  string  $connection
 	 * @return PDO
@@ -22,19 +25,9 @@ class DB {
 			$connection = Config::get('db.default');
 		}
 
-		if ( ! array_key_exists($connection, static::$connections))
-		{
-			$config = Config::get('db.connections');
-
-			if ( ! array_key_exists($connection, $config))
-			{
-				throw new \Exception("Database connection [$connection] is not defined.");
-			}
-
-			static::$connections[$connection] = DB\Connector::connect((object) $config[$connection]);
-		}
-
-		return static::$connections[$connection];
+		return array_key_exists($connection, static::$connections)
+                                                  ? static::$connections[$connection]
+                                                  : static::$connections[$connection] = DB\Connector::connect($connection);
 	}
 
 	/**

system/db/connector.php

@@ -1,5 +1,7 @@
 <?php namespace System\DB;
 
+use System\Config;
+
 class Connector {
 
 	/**
@@ -17,11 +19,13 @@ class Connector {
 	/**
 	 * Establish a PDO database connection.
 	 *
-	 * @param  object  $config
+	 * @param  string  $connection
 	 * @return PDO
 	 */
-	public static function connect($config)
+	public static function connect($connection)
 	{
+		$config = static::configuration($connection);
+
 		if ($config->driver == 'sqlite')
 		{
 			return static::connect_to_sqlite($config);
@@ -37,14 +41,14 @@ class Connector {
 	/**
 	 * Establish a PDO connection to a SQLite database.
 	 *
+	 * SQLite database paths can be specified either relative to the application/db
+	 * directory, or as an absolute path to any location on the file system.
+	 *
 	 * @param  array  $config
 	 * @return PDO
 	 */
 	private static function connect_to_sqlite($config)
 	{
-		// Database paths can either be specified relative to the application/storage/db
-		// directory, or as an absolute path.
-
 		if (file_exists($path = APP_PATH.'storage/db/'.$config->database.'.sqlite'))
 		{
 			return new \PDO('sqlite:'.$path, null, null, static::$options);
@@ -84,4 +88,22 @@ class Connector {
 		return $connection;
 	}
 
+	/**
+	 * Get the configuration options for a database connection.
+	 *
+	 * @param  string  $connection
+	 * @return object
+	 */
+	private static function configuration($connection)
+	{
+		$config = Config::get('db.connections');
+
+		if ( ! array_key_exists($connection, $config))
+		{
+			throw new \Exception("Database connection [$connection] is not defined.");
+		}
+
+		return (object) $config[$connection];
+	}
+
 }