org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.zxy.dao.BookDao.queryBook'. It's likely that neither a Result Type nor a Result Map was specified.
已运行查询，但未找到映射语句的结果映射
未找到映射语句，原因可能是mapper文件中查询的返回值类型错误
如写成这样parameterType="com.zxy.pojo.Book"
应写成resultType="com.zxy.pojo.Book"
