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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   * MSSQL specific recordset.
  19   *
  20   * @package    core_dml
  21   * @copyright  2009 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  require_once (__DIR__.'/moodle_recordset.php');
  28  
  29  class mssql_native_moodle_recordset extends moodle_recordset {
  30  
  31      protected $rsrc;
  32      protected $current;
  33  
  34      public function __construct($rsrc) {
  35          $this->rsrc  = $rsrc;
  36          $this->current = $this->fetch_next();
  37      }
  38  
  39      public function __destruct() {
  40          $this->close();
  41      }
  42  
  43      private function fetch_next() {
  44          if (!$this->rsrc) {
  45              return false;
  46          }
  47          if (!$row = mssql_fetch_assoc($this->rsrc)) {
  48              mssql_free_result($this->rsrc);
  49              $this->rsrc = null;
  50              return false;
  51          }
  52  
  53          $row = array_change_key_case($row, CASE_LOWER);
  54          // Moodle expects everything from DB as strings.
  55          foreach ($row as $k=>$v) {
  56              if (is_null($v)) {
  57                  continue;
  58              }
  59              if (!is_string($v)) {
  60                  $row[$k] = (string)$v;
  61              }
  62          }
  63          return $row;
  64      }
  65  
  66      public function current() {
  67          return (object)$this->current;
  68      }
  69  
  70      public function key() {
  71          // return first column value as key
  72          if (!$this->current) {
  73              return false;
  74          }
  75          $key = reset($this->current);
  76          return $key;
  77      }
  78  
  79      public function next() {
  80          $this->current = $this->fetch_next();
  81      }
  82  
  83      public function valid() {
  84          return !empty($this->current);
  85      }
  86  
  87      public function close() {
  88          if ($this->rsrc) {
  89              mssql_free_result($this->rsrc);
  90              $this->rsrc  = null;
  91          }
  92          $this->current = null;
  93      }
  94  }