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226 lines
9.8 KiB
226 lines
9.8 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* Class ClassManager
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*/
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class ClassManager
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{
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/**
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* Get class information
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* note: This function can't be named get_class() because that's a standard
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* php-function.
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*/
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public static function get_class_info($class_id) {
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$class_id = intval($class_id);
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$table_class = Database :: get_main_table(TABLE_MAIN_CLASS);
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$sql = "SELECT * FROM $table_class WHERE id='".$class_id."'";
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$res = Database::query($sql);
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return Database::fetch_array($res, 'ASSOC');
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}
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/**
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* Change the name of a class
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* @param string $name The new name
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* @param int $class_id The class id
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*/
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public static function set_name($name, $class_id) {
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$class_id = intval($class_id);
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$table_class = Database :: get_main_table(TABLE_MAIN_CLASS);
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$sql = "UPDATE $table_class SET name='".Database::escape_string($name)."' WHERE id='".$class_id."'";
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$res = Database::query($sql);
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}
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/**
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* Create a class
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* @param string $name
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*/
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public static function create_class($name)
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{
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$table_class = Database :: get_main_table(TABLE_MAIN_CLASS);
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$sql = "INSERT INTO $table_class SET name='".Database::escape_string($name)."'";
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$result = Database::query($sql);
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return Database::affected_rows($result) == 1;
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}
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/**
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* Check if a classname is allready in use
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* @param string $name
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*/
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public static function class_name_exists($name) {
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$table_class = Database :: get_main_table(TABLE_MAIN_CLASS);
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$sql = "SELECT * FROM $table_class WHERE name='".Database::escape_string($name)."'";
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$res = Database::query($sql);
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return Database::num_rows($res) != 0;
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}
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/**
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* Delete a class
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* @param int $class_id
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* @todo Add option to unsubscribe class-members from the courses where the
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* class was subscibed to
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*/
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public static function delete_class($class_id) {
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$class_id = intval($class_id);
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$table_class = Database :: get_main_table(TABLE_MAIN_CLASS);
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$table_class_course = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
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$table_class_user = Database :: get_main_table(TABLE_MAIN_CLASS_USER);
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$sql = "DELETE FROM $table_class_user WHERE class_id = '".$class_id."'";
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Database::query($sql);
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$sql = "DELETE FROM $table_class_course WHERE class_id = '".$class_id."'";
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Database::query($sql);
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$sql = "DELETE FROM $table_class WHERE id = '".$class_id."'";
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Database::query($sql);
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}
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/**
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* Get all users from a class
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* @param int $class_id
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* @return array
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*/
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public static function get_users($class_id) {
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$class_id = intval($class_id);
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$table_class_user = Database :: get_main_table(TABLE_MAIN_CLASS_USER);
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$table_user = Database :: get_main_table(TABLE_MAIN_USER);
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$sql = "SELECT * FROM $table_class_user cu, $table_user u WHERE cu.class_id = '".$class_id."' AND cu.user_id = u.user_id";
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$res = Database::query($sql);
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$users = array ();
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while ($user = Database::fetch_array($res, 'ASSOC')) {
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$users[] = $user;
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}
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return $users;
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}
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/**
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* Add a user to a class. If the class is subscribed to a course, the new
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* user will also be subscribed to that course.
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* @param int $user_id The user id
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* @param int $class_id The class id
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*/
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public static function add_user($user_id, $class_id) {
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$table_class_user = Database :: get_main_table(TABLE_MAIN_CLASS_USER);
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$user_id = intval($user_id);
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$class_id = intval($class_id);
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$sql = "INSERT IGNORE INTO $table_class_user SET user_id = '".$user_id."', class_id='".$class_id."'";
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Database::query($sql);
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$courses = ClassManager :: get_courses($class_id);
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foreach ($courses as $index => $course) {
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CourseManager :: subscribe_user($user_id, $course['course_code']);
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}
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}
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/**
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* Unsubscribe a user from a class. If the class is also subscribed in a
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* course, the user will be unsubscribed from that course
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* @param int $user_id The user id
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* @param int $class_id The class id
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*/
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public static function unsubscribe_user($user_id, $class_id) {
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$class_id = intval($class_id);
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$user_id = intval($user_id);
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$table_class_user = Database :: get_main_table(TABLE_MAIN_CLASS_USER);
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$table_course_class = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
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$courses = ClassManager :: get_courses($class_id);
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if (count($courses) != 0) {
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$course_codes = array ();
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foreach ($courses as $index => $course) {
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$course_codes[] = $course['course_code'];
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$sql = "SELECT DISTINCT user_id FROM $table_class_user t1, $table_course_class t2 WHERE t1.class_id=t2.class_id AND course_code = '".$course['course_code']."' AND user_id = $user_id AND t2.class_id<>'$class_id'";
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$res = Database::query($sql);
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if (Database::num_rows($res) == 0 && CourseManager :: get_user_in_course_status($user_id, $course['course_code']) == STUDENT)
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{
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CourseManager :: unsubscribe_user($user_id, $course['course_code']);
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}
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}
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}
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$sql = "DELETE FROM $table_class_user WHERE user_id='".$user_id."' AND class_id = '".$class_id."'";
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Database::query($sql);
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}
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/**
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* Get all courses in which a class is subscribed
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* @param int $class_id
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* @return array
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*/
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public static function get_courses($class_id) {
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$class_id = intval($class_id);
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$table_class_course = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
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$table_course = Database :: get_main_table(TABLE_MAIN_COURSE);
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$sql = "SELECT * FROM $table_class_course cc, $table_course c WHERE cc.class_id = '".$class_id."' AND cc.course_code = c.code";
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$res = Database::query($sql);
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$courses = array ();
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while ($course = Database::fetch_array($res, 'ASSOC')) {
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$courses[] = $course;
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}
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return $courses;
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}
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/**
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* Subscribe all members of a class to a course
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* @param int $class_id The class id
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* @param string $course_code The course code
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*/
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public static function subscribe_to_course($class_id, $course_code)
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{
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$tbl_course_class = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
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$tbl_class_user = Database :: get_main_table(TABLE_MAIN_CLASS_USER);
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$sql = "INSERT IGNORE INTO $tbl_course_class SET course_code = '".Database::escape_string($course_code)."', class_id = '".Database::escape_string($class_id)."'";
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Database::query($sql);
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$sql = "SELECT user_id FROM $tbl_class_user WHERE class_id = '".intval($class_id)."'";
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$res = Database::query($sql);
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while ($user = Database::fetch_object($res)) {
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CourseManager :: subscribe_user($user->user_id, $course_code);
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}
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}
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/**
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* Unsubscribe a class from a course.
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* Only students are unsubscribed. If a user is member of 2 classes which
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* are both subscribed to the course, the user stays in the course.
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* @param int $class_id The class id
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* @param string $course_code The course code
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*/
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public static function unsubscribe_from_course($class_id, $course_code)
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{
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$tbl_course_class = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
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$tbl_class_user = Database :: get_main_table(TABLE_MAIN_CLASS_USER);
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$sql = "SELECT cu.user_id,COUNT(cc.class_id) FROM $tbl_course_class cc, $tbl_class_user cu WHERE cc.class_id = cu.class_id AND cc.course_code = '".Database::escape_string($course_code)."' GROUP BY cu.user_id HAVING COUNT(cc.class_id) = 1";
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$single_class_users = Database::query($sql);
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while ($single_class_user = Database::fetch_object($single_class_users))
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{
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$sql = "SELECT * FROM $tbl_class_user WHERE class_id = '".intval($class_id)."' AND user_id = '".Database::escape_string($single_class_user->user_id)."'";
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$res = Database::query($sql);
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if (Database::num_rows($res) > 0)
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{
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if (CourseManager :: get_user_in_course_status($single_class_user->user_id, $course_code) == STUDENT)
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{
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CourseManager :: unsubscribe_user($single_class_user->user_id, $course_code);
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}
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}
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}
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$sql = "DELETE FROM $tbl_course_class WHERE course_code = '".Database::escape_string($course_code)."' AND class_id = '".Database::escape_string($class_id)."'";
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Database::query($sql);
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}
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/**
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* Get the class-id
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* @param string $name The class name
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* @return int the ID of the class
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*/
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public static function get_class_id($name) {
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$name = Database::escape_string($name);
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$table_class = Database :: get_main_table(TABLE_MAIN_CLASS);
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$sql = "SELECT * FROM $table_class WHERE name='".$name."'";
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$res = Database::query($sql);
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$obj = Database::fetch_object($res);
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return $obj->id;
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}
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/**
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* Get all classes subscribed in a course
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* @param string $course_code
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* @return array An array with all classes (keys: 'id','code','name')
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*/
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public static function get_classes_in_course($course_code) {
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$table_class = Database :: get_main_table(TABLE_MAIN_CLASS);
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$table_course_class = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
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$sql = "SELECT cl.* FROM $table_class cl, $table_course_class cc WHERE cc.course_code = '".Database::escape_string($course_code)."' AND cc.class_id = cl.id";
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$res = Database::query($sql);
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$classes = array ();
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while ($class = Database::fetch_array($res, 'ASSOC')) {
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$classes[] = $class;
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}
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return $classes;
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}
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}
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