private PennCourseReviewDBMgr(Context context) {
    dbHelper = PennCourseReviewDBHelper.getInstance(context);
    db = dbHelper.getWritableDatabase();

    codeDAO = new CodeDAO(db);
    courseCodeDAO = new CourseCodeDAO(db);
    courseDAO = new CourseDAO(db);
    courseDetailDAO = new CourseDetailDAO(db);
    courseSectionDAO = new CourseSectionDAO(db);
    deptDAO = new DepartmentDAO(db);
    instrDAO = new InstructorDAO(db);
    invertedIndexDAO = new InvertedIndexDAO(db);
    recentDAO = new RecentDAO(db);
    semesterDAO = new SemesterDAO(db);
  }
 public void clearDatabase() {
   dbHelper.clearDatabase(db);
 }
 public long getDatabaseSize(Context context) {
   return dbHelper.getDatabaseSize(context);
 }