一个简单作业，主要完成 登陆，文件上传，登陆结果通过数据库验证，文件上传资料写入表中。分享给有需要的同学，高手勿下！-A simple operation, mainly to complete login, file upload, log the results of the database authentication, file upload to write data table. Students need to share, not under the master!