// get booked date
  public ArrayList<Lesson_Booked> getLessonBooked(String trigger, String date3, String date4) {

    ArrayList<Lesson_Booked> arrayList_booked = new ArrayList<Lesson_Booked>();
    String selectQuery = null;
    if (trigger.equals("all")) {
      selectQuery = "SELECT  * FROM " + TABLE_LESSON_BOOKED;
    } else {
      selectQuery =
          "SELECT  * FROM "
              + TABLE_LESSON_BOOKED
              + " where "
              + LessonDate
              + ">="
              + date3
              + " AND "
              + LessonDate
              + "<="
              + date4;
    }
    SQLiteDatabase db = this.getReadableDatabase();

    try {
      cursor = (SQLiteCursor) db.rawQuery(selectQuery, null);
      if (cursor.moveToFirst()) {
        do {

          Lesson_Booked lesson_booked = new Lesson_Booked();
          lesson_booked.setID(cursor.getString(cursor.getColumnIndex(LID)));
          lesson_booked.setDescription(cursor.getString(cursor.getColumnIndex(Description)));
          lesson_booked.setStart_timing(cursor.getString(cursor.getColumnIndex(Starttime)));
          lesson_booked.setEnd_timing(cursor.getString(cursor.getColumnIndex(Endtime)));
          lesson_booked.setDate(cursor.getString(cursor.getColumnIndex(LessonDate)));

          arrayList_booked.add(lesson_booked);

          // array_studentlist.set(studentList);
        } while (cursor.moveToNext());
      }

      cursor.getWindow().clear();
      cursor.close();
      // close inserting data from database
      db.close();
      // return city list
      return arrayList_booked;

    } catch (Exception e) {
      e.printStackTrace();
      if (cursor != null) {
        cursor.getWindow().clear();
        cursor.close();
      }

      db.close();
      return arrayList_booked;
    }
  }