$options = '';
if ($driver == 'mysql' OR $driver == 'mysqli')
{
  if ($params['pconnect'] === TRUE)
  {
    $options .= '?persist';
  }
  $flags = MYSQL_CLIENT_COMPRESS;
  if ($params['ssl'] === TRUE)
  {
    $flags = $flags | MYSQL_CLIENT_SSL;
  }
  $options .= (empty($options)?'?':'&')."clientflags=$flags";
}

$dsn = "{$driver}://{$username}:{$password}@{$hostname}/{$database}{$options}";

$adodb =& ADONewConnection($dsn);

if ($adodb)
{
  //set fetch mode
  $adodb->SetFetchMode(ADODB_FETCH_BOTH);

  //character set
  if ($driver == 'mysql' OR $driver == 'mysqli')
  {
    if (isset($params['char_set']) AND $params['char_set']
        AND isset($params['dbcollat']) AND $params['dbcollat'])
    {
      $charset    = $adodb->qstr($params['char_set']);
      $collation  = $adodb->qstr($params['dbcollat']);
      $adodb->Execute("SET NAMES $charset COLLATE $collation");
    }
  }
  if ($debug)
  {
    @ob_start();
    $adodb->debug = TRUE;
  }
}