分页

1.使用Limit分页

语法：SELECT * from user limit startIndex,pageSize; SELECT * from user limit 3; #[0,n]

1.编写接口

//分页查询 List<User> getUserByLimit(Map<String,Integer> map);

2.mapper中配置

<select id="getUserByLimit" parameterType="map" resultType="User"> select * from mybatis.user limit #{startIndex},#{pageSize} </select>

3.测试

@Test public void getUserByLimit(){ SqlSession sqlSession = MybatisUtils.getSqlSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); Map<String,Integer> map = new HashMap<String, Integer>(); map.put("startIndex",0); map.put("pageSize",2); List<User> users = mapper.getUserByLimit(map); for (User user : users) { System.out.println(user); } sqlSession.close(); }

2. RowBounds分页

编写接口

//分页2 List<User> getUserByRowBounds();

mapper.xml

<!--分页2--> <select id="getUserByRowBounds" resultType="User"> select * from mybatis.user </select>

测试

@Test public void getUserByRowBounds(){ SqlSession sqlSession = MybatisUtils.getSqlSession(); //RowBounds实现 RowBounds rowBounds = new RowBounds(0, 2); //通过Java代码层面实现分页 List<User> userList = sqlSession.selectList("com.kuang.dao.UserMapper.getUserByRowBounds",null,rowBounds); for (User user : userList) { System.out.println(user); } sqlSession.close(); }

3. 第三方插件PageHelper

官网：https://pagehelper.github.io/ 无论用什么方法，底层都是sql语句limit实现