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256 lines
8.4 KiB
256 lines
8.4 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* Defines a gradebook ExerciseLink object.
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* @author Bert Steppé
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* @package chamilo.gradebook
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*/
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/**
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* Class
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* @package chamilo.gradebook
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*/
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class ExerciseLink extends AbstractLink
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{
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// INTERNAL VARIABLES
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private $course_info = null;
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private $exercise_table = null;
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private $exercise_data = null;
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// CONSTRUCTORS
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function __construct() {
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parent::__construct();
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$this->set_type(LINK_EXERCISE);
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}
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// FUNCTIONS IMPLEMENTING ABSTRACTLINK
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/**
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* Generate an array of exercises that a teacher hasn't created a link for.
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* @return array 2-dimensional array - every element contains 2 subelements (id, name)
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*/
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public function get_not_created_links() {
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return false;
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if (empty($this->course_code)) {
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die('Error in get_not_created_links() : course code not set');
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}
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$tbl_grade_links = Database :: get_main_table(TABLE_MAIN_GRADEBOOK_LINK);
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$sql = 'SELECT id, title from '.$this->get_exercise_table().' exe
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WHERE id NOT IN (
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SELECT ref_id FROM '.$tbl_grade_links.'
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WHERE type = '.LINK_EXERCISE." AND
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course_code = '".$this->get_course_code()."'
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) AND
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exe.c_id = ".$this->course_id;
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$result = Database::query($sql);
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$cats = array();
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while ($data=Database::fetch_array($result)) {
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$cats[] = array ($data['id'], $data['title']);
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}
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return $cats;
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}
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/**
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* Generate an array of all exercises available.
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* @return array 2-dimensional array - every element contains 2 subelements (id, name)
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*/
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public function get_all_links() {
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if (empty($this->course_code)) {
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die('Error in get_not_created_links() : course code not set');
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}
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$session_id = api_get_session_id();
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if (empty($session_id)) {
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$session_condition = api_get_session_condition(0, true);
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} else {
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$session_condition = api_get_session_condition($session_id, true, true);
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}
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$sql = 'SELECT id,title from '.$this->get_exercise_table().'
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WHERE c_id = '.$this->course_id.' AND active=1 '.$session_condition;
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/* $sql = 'SELECT id,title from '.$this->get_exercise_table().'
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WHERE c_id = '.$this->course_id.' AND active=1 AND session_id='.api_get_session_id().'';
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*/
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$result = Database::query($sql);
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$cats = array();
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while ($data=Database::fetch_array($result)) {
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$cats[] = array ($data['id'], $data['title']);
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}
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return $cats;
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}
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/**
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* Has anyone done this exercise yet ?
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*/
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public function has_results() {
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$tbl_stats = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
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$session_id = api_get_session_id();
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$sql = 'SELECT count(exe_id) AS number FROM '.$tbl_stats."
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WHERE session_id = $session_id AND
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exe_cours_id = '".$this->get_course_code()."'".' AND
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exe_exo_id = '.(int)$this->get_ref_id();
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$result = Database::query($sql);
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$number=Database::fetch_row($result);
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return ($number[0] != 0);
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}
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/**
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* Get the score of this exercise. Only the first attempts are taken into account.
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* @param $stud_id student id (default: all students who have results - then the average is returned)
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* @return array (score, max) if student is given
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* array (sum of scores, number of scores) otherwise
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* or null if no scores available
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*/
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public function calc_score($stud_id = null) {
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$tbl_stats = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
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//$tbl_stats_e_attempt_recording = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);
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//the following query should be similar (in conditions) to the one used in exercice/exercice.php, look for note-query-exe-results marker
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$session_id = api_get_session_id();
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$sql = "SELECT * FROM $tbl_stats
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WHERE exe_exo_id = ".intval($this->get_ref_id())." AND
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orig_lp_id = 0 AND
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orig_lp_item_id = 0 AND
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status <> 'incomplete' AND
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session_id = $session_id
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";
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if (isset($stud_id)) {
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$course_code_exe = $this->get_course_code();
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$sql .= " AND exe_cours_id = '$course_code_exe' AND
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exe_user_id = '$stud_id' ";
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}
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$sql .= ' ORDER BY exe_id DESC';
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$scores = Database::query($sql);
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if (isset($stud_id)) {
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// for 1 student
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if ($data = Database::fetch_array($scores)) {
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return array ($data['exe_result'], $data['exe_weighting']);
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} else {
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return null;
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}
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} else {
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/// all students -> get average
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// normal way of getting the info
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$students = array(); // user list, needed to make sure we only
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// take first attempts into account
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$student_count = 0;
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$sum = 0;
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while ($data = Database::fetch_array($scores, 'ASSOC')) {
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if (!in_array($data['exe_user_id'], $students)) {
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if ($data['exe_weighting'] != 0) {
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$students[] = $data['exe_user_id'];
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$student_count++;
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$sum += $data['exe_result'] / $data['exe_weighting'];
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}
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}
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}
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if ($student_count == 0) {
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return null;
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} else {
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return array ($sum , $student_count);
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}
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}
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}
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/**
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* Get URL where to go to if the user clicks on the link.
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* First we go to exercise_jump.php and then to the result page.
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* Check this php file for more info.
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*/
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public function get_link() {
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//status student
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$user_id = api_get_user_id();
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$course_code = $this->get_course_code();
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$status_user=api_get_status_of_user_in_course ($user_id, $course_code);
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$session_id =api_get_session_id();
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$url = api_get_path(WEB_PATH).'main/gradebook/exercise_jump.php?session_id='.$session_id.'&cidReq='.$this->get_course_code().'&gradebook=view&exerciseId='.$this->get_ref_id();
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if ((!api_is_allowed_to_edit() && $this->calc_score(api_get_user_id()) == null) || $status_user!=1) {
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$url .= '&doexercise='.$this->get_ref_id();
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}
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return $url;
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}
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/**
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* Get name to display: same as exercise title
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*/
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public function get_name() {
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$data = $this->get_exercise_data();
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return $data['title'];
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}
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/**
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* Get description to display: same as exercise description
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*/
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public function get_description() {
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$data = $this->get_exercise_data();
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return $data['description'];
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}
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/**
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* Check if this still links to an exercise
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*/
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public function is_valid_link() {
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//$sql = 'SELECT count(id) from '.$this->get_exercise_table().' WHERE c_id = '.$this->course_id.' AND id = '.(int)$this->get_ref_id().' AND session_id='.api_get_session_id().'';
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$sql = 'SELECT count(id) from '.$this->get_exercise_table().' WHERE c_id = '.$this->course_id.' AND id = '.(int)$this->get_ref_id().' ';
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$result = Database::query($sql);
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$number=Database::fetch_row($result);
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return ($number[0] != 0);
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}
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public function get_type_name() {
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return get_lang('Quiz');
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}
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public function needs_name_and_description() {
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return false;
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}
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public function needs_max() {
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return false;
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}
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public function needs_results() {
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return false;
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}
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public function is_allowed_to_change_name() {
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return false;
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}
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// INTERNAL FUNCTIONS
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/**
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* Lazy load function to get the database table of the exercise
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*/
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private function get_exercise_table () {
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$this->exercise_table = Database :: get_course_table(TABLE_QUIZ_TEST);
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return $this->exercise_table;
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}
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/**
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* Lazy load function to get the database contents of this exercise
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*/
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private function get_exercise_data() {
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$tbl_exercise = $this->get_exercise_table();
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if ($tbl_exercise=='') {
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return false;
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} elseif (!isset($this->exercise_data)) {
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$sql = 'SELECT * FROM '.$this->get_exercise_table().'
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WHERE c_id = '.$this->course_id.' AND id = '.(int)$this->get_ref_id().' ';
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$result = Database::query($sql);
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$this->exercise_data=Database::fetch_array($result);
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}
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return $this->exercise_data;
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}
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public function get_icon_name() {
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return 'exercise';
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}
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} |