@Override public Boolean run(Connection conn) throws SQLException { PreparedStatement stmt = prepareStatement( conn, "update cc_quizzes as q" + " join cc_course_registrations as cr on cr.course_id = q.course_id" + " and cr.section = q.section" + " and cr.user_id = ?" + " and q.problem_id = ?" + " and q.section = ?" + " and q.course_id = ?" + " set end_time = ?"); stmt.setInt(1, user.getId()); stmt.setInt(2, quiz.getProblemId()); stmt.setInt(3, quiz.getSection()); stmt.setInt(4, quiz.getCourseId()); long currentTime = System.currentTimeMillis(); stmt.setLong(5, currentTime); int updateCount = stmt.executeUpdate(); return updateCount > 0; }