lib/dml/mysqli_native_moodle_recordset.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  * Mysqli specific recordset.
  19  *
  20  * @package    core_dml
  21  * @copyright  2008 Petr Skoda (http://skodak.org)
  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 /**
  30  * Mysqli specific moodle recordset class
  31  *
  32  * @package    core
  33  * @subpackage dml_driver
  34  * @copyright  2008 Petr Skoda (http://skodak.org)
  35  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  36  */
  37 class mysqli_native_moodle_recordset extends moodle_recordset {
  38
  39     protected $result;
  40     protected $current;
  41
  42     public function __construct($result) {
  43         $this->result  = $result;
  44         $this->current = $this->fetch_next();
  45     }
  46
  47     public function __destruct() {
  48         $this->close();
  49     }
  50
  51     private function fetch_next() {
  52         if (!$this->result) {
  53             return false;
  54         }
  55         if (!$row = $this->result->fetch_assoc()) {
  56             $this->result->close();
  57             $this->result = null;
  58             return false;
  59         }
  60
  61         $row = array_change_key_case($row, CASE_LOWER);
  62         return $row;
  63     }
  64
  65     public function current() {
  66         return (object)$this->current;
  67     }
  68
  69     public function key() {
  70         // return first column value as key
  71         if (!$this->current) {
  72             return false;
  73         }
  74         $key = reset($this->current);
  75         return $key;
  76     }
  77
  78     public function next() {
  79         $this->current = $this->fetch_next();
  80     }
  81
  82     public function valid() {
  83         return !empty($this->current);
  84     }
  85
  86     public function close() {
  87         if ($this->result) {
  88             $this->result->close();
  89             $this->result  = null;
  90         }
  91         $this->current = null;
  92     }
  93 }