final public function openConnection ()
	{
		$this->connection = mysqli_connect(
			getConstant('DB_HOST', TRUE),
			getConstant('DB_USERNAME', TRUE),
			getConstant('DB_PASSWORD', TRUE),
			getConstant('DB_NAME', TRUE)
		);
		$errorMessage 	= "Database connection failed: ".mysqli_connect_error();
		$errorMessage 	.= " (" .mysqli_connect_errno(). ")";
		if (!$this->connection) die($errorMessage);
	}