Removed Connection::__sleep.

framework/yii/db/Connection.php

@@ -251,15 +251,6 @@ class Connection extends Component
 	 */
 	private $_schema;
 
-	/**
-	 * Closes the connection when this component is being serialized.
-	 * @return array
-	 */
-	public function __sleep()
-	{
-		$this->close();
-		return array_keys(get_object_vars($this));
-	}
 	
 	/**
 	 * Returns a value indicating whether the DB connection is established.