九Limit分页

Posted 2022-03-29 &小小白&

九、Limit分页

9.1、使用Limit分页

语法：SELECT * from user limit startIndex,pagesize;
SELECT * from user limit3; #[0,n]

9.2、使用Mybatis实现分页，核心SQL

1. 接口

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

2. Mapper.xml

<!--分页-->
<select id="getUserByLimit"  parameterType="map" resultType="user">
    select * from user limit #startIndex,#pageSize
</select>

3. 测试

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