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源碼下載地址：

http://download.csdn.net/download/qq78442761/9971770

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用SQLyog查看如下圖所示：

數據庫涉及3個表的構建下面是相關代碼。

ER圖如下所示：

下面是上課和下課打卡的流程圖：

左圖為上課，右圖為下課

具體代碼如下：

DROP TABLE IF EXISTS `subject`;CREATE TABLE `subject` (`id` int(11) NOT NULL,`name` varchar(50) COLLATE utf8_unicode_ci NOT NULL,`time_from` time NOT NULL,`time_to` time NOT NULL,PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;CREATE TABLE `student` (`CardNum` int(11) NOT NULL,`id` int(11) NOT NULL,`class` int(11) NOT NULL,`name` varchar(50) COLLATE utf8_unicode_ci NOT NULL,PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;CREATE TABLE `chose` (`subject_id` int(11) NOT NULL,`student_id` int(11) NOT NULL,`in_num` int(11) NOT NULL,`out_num` int(11) NOT NULL,KEY `Stu_id` (`student_id`),KEY `Sub_id` (`subject_id`),CONSTRAINT `Stu_id` FOREIGN KEY (`student_id`) REFERENCES `student` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,CONSTRAINT `Sub_id` FOREIGN KEY (`subject_id`) REFERENCES `subject` (`id`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

下面是一些簡單的SQL語句，都插入到Qt程序里面了：

//上課打卡時：查詢選課表中是否有此人 select * from student where id in (select student_id from chose where student_id =(select id from Student where CardNum=0110 and subject_id=(select id from subject where now()>=time_from and now()<=time_to))); 如果有就： update chose set in_num=in_num+1 where student_id=XXXXXXXX;//下課打卡時：查詢選課表中是否有此人 select * from student where id in (select student_id from chose where student_id =(select id from Student where CardNum=0110 and subject_id=(select id from subject where now()>time_to))); 如果有就 update chose set out_num=in_num+1 where student_id=XXXXXXXX;//根據學號查詢對應學號所有課程的出勤信息 select student.id,subject.name,chose.in_num from student,chose,subject where chose.student_id=14220307 and student.id=14220307//根據姓名查詢對應學號所有課程的出勤信息 SELECT student.name,subject.name,chose.in_num FROM student,chose,SUBJECT WHERE chose.student_id = (SELECT id FROM student WHERE NAME='張三') AND student.id=(SELECT id FROM student WHERE NAME='張三');//查詢選取了此課表的所有出勤人信息,和出勤分數： select subject.id,subject.name,student.id,student.name,chose.in_num,chose.in_num*10 as '出勤分數'from subject,student,chose where subject.id=chose.subject_id and chose.student_id=student.id;//更具學號刪除學生數據 delete from student where id=14220310;//添加學生 insert into student values(9999,14220388,142203,'小白');

這里我們說以下用Qt連接數據庫，這里只提供關鍵代碼：

QStringAndBool ConnMysql::LinkMySQL() {db=QSqlDatabase::addDatabase("QMYSQL");db.setHostName("localhost");db.setDatabaseName(m_DataBase);db.setUserName(m_UserName);db.setPassword(m_PassWd);QStringAndBool returnValues;if(!db.open()){QMessageBox::information(NULL,"提示","數據庫連接失敗！");returnValues.MesQString="數據庫連接失敗！";returnValues.MesBool=0;return returnValues;}else{QMessageBox::information(NULL,"提示","數據庫連接成功！",QMessageBox::Ok);returnValues.MesQString="數據庫連接成功！";returnValues.MesBool=1;return returnValues;} }void ConnMysql::DisLinkMysql() {QString SqlQuery="exit";model->setQuery(SqlQuery);}

注意：具體代碼在本博文開頭，此處只有關鍵代碼；

上一篇博文：

大四課程設計之基于RFID技術的考勤管理系統(二)讀取COM口數據

http://blog.csdn.net/qq78442761/article/details/77950585

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大四課程設計之基于RFID技術的考勤管理系統(四)Qt界面設計

http://blog.csdn.net/qq78442761/article/details/77951707

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