Servlet案例:发生错误org.springframework.dao.EmptyResultDataAccessException: Incorrect result size: expecte
20-Jun-2020 20:48:31.466 信息 [http-nio-8080-exec-7] com.alibaba.druid.pool.DruidDataSource.info {dataSource-1} inited
org.springframework.dao.EmptyResultDataAccessException: Incorrect result size: expected 1, actual 0