public static void main(String[] args) {
		ProblemDAO p = new ProblemDAO();
		Problem problem = new Problem("小鸡站位2", "10个小鸡要站成7列", "xinzai");
		System.out.println(p.findById(2).toString());
		p.save(problem);
		/*List<Problem> pl = p.findPage(2, 2);
		for (Problem problem : pl) {
			System.out.println(problem.toString());
		}*/
	}