I am playing with different ways to do database interaction in PHP, and one of the ideas I have been playing with is connecting to the DB in the constructor and disconnecting in the destructor. This is the code from my Database class.

function __construct()
{
  $this->link = mysql_connect($this->server.':'.$this->port, $this->username);
  if(!$this->link)
    die('Could not connect: '.mysql_error());

  if(!mysql_select_db($this->database, $this->link))
    die('Could not select database: '.mysql_error());
}    

function __destruct()
{
  if(mysql_close($this->link))
    $this->link = null; 
}

This works well, my only reservation is that if I need to connect several to hit the database several times it will do multiple connections and disconnects. If I do that a lot I can see, maybe, potential problems. Is this a concern or is there a better way to do this? And is my code even up to snuff in general?