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<?php
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/**
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* Defines a gradebook ExerciseLink object.
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* @author Bert Stepp<EFBFBD>
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* @package dokeos.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 $exercise_data = null;
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// CONSTRUCTORS
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function ExerciseLink()
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{
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$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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{
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if (empty($this->course_code))
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die('Error in get_not_created_links() : course code not set');
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$tbl_grade_links = Database :: get_main_table(TABLE_MAIN_GRADEBOOK_LINK);
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$sql = 'SELECT id,title from '.$this->get_exercise_table()
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.' WHERE id NOT IN'
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.' (SELECT ref_id FROM '.$tbl_grade_links
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.' WHERE type = '.LINK_EXERCISE
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." AND course_code = '".$this->get_course_code()."'"
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.')';
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$result = api_sql_query($sql, __FILE__, __LINE__);
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$cats=array();
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while ($data=mysql_fetch_array($result))
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{
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$cats[] = array ($data['id'], $data['title']);
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}
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return $cats;
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}
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/**
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* Generate an array of all exercises available.
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* @return array 2-dimensional array - every element contains 2 subelements (id, name)
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*/
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public function get_all_links()
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{
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if (empty($this->course_code))
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die('Error in get_not_created_links() : course code not set');
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$course_info = api_get_course_info($this->course_code);
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$tbl_grade_links = Database :: get_main_table(TABLE_MAIN_GRADEBOOK_LINK,$course_info['dbName']);
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$sql = 'SELECT id,title from '.$this->get_exercise_table();
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$result = api_sql_query($sql, __FILE__, __LINE__);
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$cats=array();
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while ($data=mysql_fetch_array($result))
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{
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$cats[] = array ($data['id'], $data['title']);
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}
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return $cats;
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}
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/**
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* Has anyone done this exercise yet ?
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*/
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public function has_results()
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{
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$tbl_stats = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
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$sql = 'SELECT count(exe_id) AS number FROM '.$tbl_stats
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." WHERE exe_cours_id = '".$this->get_course_code()."'"
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.' AND exe_exo_id = '.$this->get_ref_id();
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$result = api_sql_query($sql, __FILE__, __LINE__);
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$number=mysql_fetch_row($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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{
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$tbl_stats = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
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$sql = 'SELECT * FROM '.$tbl_stats
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." WHERE exe_cours_id = '".$this->get_course_code()."'"
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.' AND exe_exo_id = '.$this->get_ref_id();
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if (isset($stud_id))
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$sql .= ' AND exe_user_id = '.$stud_id;
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// order by id, that way the student's first attempt is accessed first
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$sql .= ' ORDER BY exe_id';
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$scores = api_sql_query($sql, __FILE__, __LINE__);
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// for 1 student
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if (isset($stud_id))
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{
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if ($data=mysql_fetch_array($scores))
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return array ($data['exe_result'], $data['exe_weighting']);
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else
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return null;
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}
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// all students -> get average
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else
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{
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$students=array(); // user list, needed to make sure we only
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// take first attempts into account
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$rescount = 0;
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$sum = 0;
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while ($data=mysql_fetch_array($scores))
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{
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if (!(array_key_exists($data['exe_user_id'],$students)))
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{
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if ($data['exe_weighting'] != 0)
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{
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$students[$data['exe_user_id']] = $data['exe_result'];
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$rescount++;
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$sum += ($data['exe_result'] / $data['exe_weighting']);
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}
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}
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}
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if ($rescount == 0)
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return null;
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else
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return array ($sum , $rescount);
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}
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}
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/**
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* Get URL where to go to if the user clicks on the link.
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* First we go to exercise_jump.php and then to the result page.
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* Check this php file for more info.
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*/
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public function get_link()
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{
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$url = api_get_path(WEB_PATH)
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.'main/gradebook/exercise_jump.php?cid='.$this->get_course_code();
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if (!api_is_allowed_to_create_course()
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&& $this->calc_score(api_get_user_id()) == null)
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$url .= '&doexercise='.$this->get_ref_id();
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return $url;
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}
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/**
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* Get name to display: same as exercise title
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*/
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public function get_name()
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{
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$data = $this->get_exercise_data();
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return $data['title'];
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}
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/**
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* Get description to display: same as exercise description
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*/
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public function get_description()
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{
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$data = $this->get_exercise_data();
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return $data['description'];
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}
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/**
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* Check if this still links to an exercise
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*/
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public function is_valid_link()
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{
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$sql = 'SELECT count(id) from '.$this->get_exercise_table()
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.' WHERE id = '.$this->get_ref_id();
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$result = api_sql_query($sql, __FILE__, __LINE__);
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$number=mysql_fetch_row($result);
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return ($number[0] != 0);
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}
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public function get_type_name()
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{
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return get_lang('DokeosExercises');
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}
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public function needs_name_and_description()
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{
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return false;
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}
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public function needs_max()
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{
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return false;
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}
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public function needs_results()
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{
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return false;
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}
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public function is_allowed_to_change_name()
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{
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return false;
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}
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// INTERNAL FUNCTIONS
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/**
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* Lazy load function to get the database table of the exercise
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*/
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private function get_exercise_table ()
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{
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if (!isset($this->exercise_table))
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{
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$course_info = Database :: get_course_info($this->get_course_code());
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$database_name = $course_info['db_name'];
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$this->exercise_table = Database :: get_course_table(TABLE_QUIZ_TEST, $database_name);
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}
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return $this->exercise_table;
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}
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/**
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* Lazy load function to get the database contents of this exercise
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*/
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private function get_exercise_data()
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{
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if (!isset($this->exercise_data))
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{
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$sql = 'SELECT * from '.$this->get_exercise_table()
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.' WHERE id = '.$this->get_ref_id();
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$result = api_sql_query($sql, __FILE__, __LINE__);
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$this->exercise_data=mysql_fetch_array($result);
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}
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return $this->exercise_data;
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}
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}
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?>
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