Mybatis 使用分页插件pageHelper、JSqlParser

由于编写分页查询业务繁琐，自己编写分页查询语句不仅使得页面代码冗余，而且开发效率低下，因此mybatis中可以借助分页插件进行分页查询的编程，提高编程效率。

下载插件：pageHelper.x.x.x.jar 和 JSqlParser.x.x.x.jar包

http://www.github.com/pageHelper

http://www.github.com/JSqlParser

首先自写分页查询：

  
  
  
     select s.s_id as id,s.s_name as name,s.s_NO as NO from t_student as s limit #{pageNum},#{pageSize};
  

	/**自定义分页查询*/
   @Test
   public void test1() {
	   try {
		InputStream in = Resources.getResourceAsStream("config.xml");
		SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = sessionFactory.openSession();	
		StudentDao studentDao = session.getMapper(StudentDao.class);
		
		Map map = new HashMap<>();
		map.put("pageNum", (2-1)*3);
		map.put("pageSize", 3);
		List list = studentDao.selectPageById(map);
		for (Student student : list) {
			System.out.println(student);
		}
	} catch (IOException e) {
		e.printStackTrace();
	} 
   }

使用分页插件：全局文件config.xml配置

一、使用pageHelper:

  
  
     select s.s_id as id,s.s_name as name,s.s_NO as NO from t_student as s
  

   /**测试pagehelper插件*/
   /**使用page*/
   @Test
   public void test2() {
	   try {
		InputStream in = Resources.getResourceAsStream("config.xml");
		SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = sessionFactory.openSession();	
		StudentDao studentDao = session.getMapper(StudentDao.class);
		
		/**查询紧跟page之后*/
		Page