Unable to view data on database separate from joomla 1.5 database - Joomla! Forum - community, help and support

$option['driver']  = 'mysql';            // database driver name
$option['host']    = 'hostname';    // database host name
$option['user']    = 'username';      // user database authentication
$option['password'] = 'password';  // password database authentication
$option['database'] = 'databasename';      // database name
$option['prefix']  = '';            // database prefix (may empty)

$db = &jdatabase::getinstance( $option );

$query = "select * tablename";
$db->setquery($query);
echo $db->loadresult();

i unable view data table in database module created in joomla 1.5.  able view data joomla database using getdbo instance. can me.