//Update information about a course
    public void setCourseInfo(String iD, JTextField newCourseName, String newCourseStart, String newCourseEnd, JComboBox newTeacher, JComboBox newSubject) {
        try {
            //Name of the new course
            String course = newCourseName.getText();
            //New id
            String tempTeacher = newTeacher.getSelectedItem().toString();
            String[] splitStr = tempTeacher.split("\\s+");
            String teacherId = getIdTeacher(splitStr[0], splitStr[1]);
            //get subject Id for course
            String courseSubject = newSubject.getSelectedItem().toString();
            String subjectId = getSubjectId(courseSubject);
            //The accual command to insert new course
            String command = "UPDATE kurs SET kursnamn= '" + course + "', kursstart= '" + newCourseStart + "', kursslut= '" + newCourseEnd + "', kurslarare= " + teacherId + ", amnestillhorighet= " + subjectId
                    + "WHERE kurs_id=" + iD;
            hwdb.insert(command);
        } catch (InfException e) {
            System.out.println(e.getMessage());
        }
    }