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   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