user/filters/anycourses.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * This is filter is used to see which students are enroled on any courses
  19  *
  20  * @package   core_user
  21  * @copyright 2014 Krister Viirsaar
  22  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24
  25 defined('MOODLE_INTERNAL') || die();
  26
  27 /**
  28  * User filter to distinguish users with no or any enroled courses.
  29  * @copyright 2014 Krister Viirsaar
  30  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  31  */
  32 class user_filter_anycourses extends user_filter_yesno {
  33
  34     /**
  35      * Returns the condition to be used with SQL
  36      *
  37      * @param array $data filter settings
  38      * @return array sql string and $params
  39      */
  40     public function get_sql_filter($data) {
  41         $value = $data['value'];
  42
  43         $not = $value ? '' : 'NOT';
  44
  45         return array("EXISTS ( SELECT userid FROM {user_enrolments} ) AND " .
  46             " id $not IN ( SELECT userid FROM {user_enrolments} )", array());
  47     }
  48 }
  49