Question

The thing is that I need to write a db class with mysqli and it should support multiple connections to different databases.
I know that multiple connections is bad, but I don’t have any other choice.

If there is any good example of class which supports multiple connections?

Do you know any tips that I should take into consideration when I will start writing the class? What is the best practice in my case?

Thanks in advance,

Answer 1

First thing that comes to mind, is a container class, that stores MySQLi object in it.
Something like this:

class MySQLiContainer extends SplObjectStorage{
  public function newConnection($host = null, $username = null, $passwd = null, $dbname = null, $port = null, $socket = null) {
    $mysqli = new mysqli($host, $username, $passwd, $dbname, $port, $socket);
    $this->attach($mysqli);
    return $mysqli;
  }
}

//usage

$mysqliContainer = new MySQLiContainer();

$c1 = $mysqliContainer->newConnection('localhost','root','root','localDatabase');
$c1->query('SELECT ....');

$c2 = $mysqliContainer->newConnection('mysql.remotehost.net','hackermom','bobbytables','schoolDatabase');

$name = 'Robert\'); DROP TABLE students;--';

$c2->multi_query("SELECT * FROM students WHERE name = '$name'");

Without knowing more about functionality required, it’s hard to say if this is a good idea though 😉

More info about SplObjectStorage class.