mybatis批量数据分页查询

@Service
public class Demo {
    @Autowired
    private UserMapper userMapper;
 
 
    /**
     * 方法1：原始mysql limit分页
     *  currentPage:当前页
     *  pageSize:每页记录数
     *  sql: select * from student limit(currentPage-1)*pageSize,pageSize;
     */
    public void service1(){
        int currentPage = 1;
        int pageSize = 10;
        List<User> list ;
        do{
            list = userMapper.selectPage((currentPage-1)*pageSize,pageSize);
            currentPage++;
            handleList(list);
        }while (list.size() == pageSize);
    }
 
    /**方法2:
     * 当查询的表唯一列，并且此列有大小顺序的
     * 利用此列查询
     */
    public void service2(){
        int id = 0;
        int pageSize = 10;
        List<User> list;
        do{
            list = userMapper.getPage(id, pageSize);
            if(list.size() >0){
                id = list.get(list.size()-1).getId();
                handleList(list);
            }
        }while (list.size() == pageSize);
    }
 
 
    /**
     *方法3：
     * 使用mybatis提供的 ResultContext 流处理
     * 注：此方法并不是分页查询，只是讲一次查询的数据逐条处理
     */
    public void service3(){
        final List<User> list = new ArrayList<>();
        userMapper.queryIncreaseFetch(resultContext->{
            // 这里查询出来多条数据
            list.add(resultContext.getResultObject());
            if(list.size()==3){
                handleList(list);
                list.clear();
            }
        });
        if(list.size() > 0){
            handleList(list);
        }
    }
    
    //业务模拟
    public void handleList( List<User> users){
        // 业务处理 可以结合多线程处理
        users.forEach(System.out::println);
    }
}

@Mapper
public interface UserMapper {
 
    void queryIncreaseFetch(ResultHandler<User> userResultHandler);
 
    List<User>  getPage(@Param("id")int id, @Param("pageSize")int pageSize);
 
    List<User> selectPage(@Param("currentPage") int currentPage,@Param("pageSize") int pageSize);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.test.springboottest.dao.UserMapper">
    <select id="queryIncreaseFetch" resultType="com.test.springboottest.entity.User">
        select * from device_info limit 10
    </select>
    <select id="getPage" resultType="com.test.springboottest.entity.User">
        select *
        from device_info
        where id > #{id}
        order by id
        limit #{pageSize}
    </select>
    <select id="selectPage" resultType="com.test.springboottest.entity.User">
        select * from device_info limit #{currentPage},#{pageSize};
    </select>
</mapper>