public function setConnection ($dsn = FALSE, $user = FALSE, $pass = FALSE, $options = FALSE)
	{
		
		$this->_dsn		= $dsn?: $this->_dsn;
		$this->_user	= $user?: $this->_user;
		$this->_pass	= $pass?: $this->_pass;
		$this->_options	= $options?: $this->_options;
		
	}