case 'issued':
require_once('Models/BookIssue.php');
$S = new BookIssue();
echo json_encode($S->issued());
break;*/
// Books related api
case 'add':
require_once 'Models/Books.php';
$S = new Books();
echo json_encode($S->add($D));
break;
case 'remove':
require_once 'Models/Books.php';
$S = new Books();
echo json_encode($S->remove($D['bookid']));
break;
case 'update':
require_once 'Models/Books.php';
$S = new Books();
echo json_encode($S->update($D['id'], $D));
break;
// User related api
/*case 'info':
require_once('Models/User.php');
$S = new User();
echo json_encode($S->info());
break;*/
// User related api
/*case 'info':
require_once('Models/User.php');