My DB classes usage

Select :

$higashi_db = new db($hostname,$databaseName,$username,$password);
//open connection

$q1 = new query('select * from users','S',$higashi_db->get_connection());
//create new query

$r = $q1->get_row();
//get the result row

echo $r['user_id'].' '.$r['money'];
//print the result

$higashi_db->close();
//close db connection