分页

使用limit分页

核心sql

1.select * from user limit startIndex,pageSize;
2.select * from user limit 3;  #[0,3)

1. 接口

//分页
List getUserByLimit(Map map);

2. Mapper.xml

    select * from mybatis.user limit #{startIndex},#{pageSize}

3. 测试

@Test
public void getUserByLimit(){
    SqlSession sqlSession = MybatisUtils.getSqlSession();

    UserMapper mapper = sqlSession.getMapper(UserMapper.class);

    HashMap map = new HashMap<>();
    map.put("startIndex",2);
    map.put("pageSize",2);

    List userList = mapper.getUserByLimit(map);
    for (User user : userList) {
        System.out.println(user);
    }
    sqlSession.close();
}

使用RowBounds分页

1. 接口

List getUserByRowBounds();

2. Mapper.xml

    select * from mybatis.user

3. 测试

@Test
public void getUserByRowBounds(){
    SqlSession sqlSession = MybatisUtils.getSqlSession();

    //RowBounds实现
    RowBounds rowBounds = new RowBounds(1, 2);

    //通过Java代码层面实现分页
    List userList = sqlSession.selectList("com.sunfl.dao.UserMapper.getUserByRowBounds",null,rowBounds);
    for (User user : userList) {
        System.out.println(user);
    }
    sqlSession.close();
}