批量插入刷新返回空数组

如何解决批量插入刷新返回空数组

在数据库中成功插入记录，但为什么flush()返回空数组？

sqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH);
            try {
                for (helloModel hello: hellos) {
                    helloMapper.insertHello(helloModel);
                }
                List<BatchResult> results = helloMapper.flush();
                log.info(" bulk insert: {} ",results);
            } finally {
                sqlSession.close();
            }


@Mapper
public interface HelloMapper {
    @Insert("upsert into accounts(id,balance) values(#{id},#{balance})")
    void insertHello(Account account);

    @Flush
    List<BatchResult> flush();
}