C语言程序设计大作业：学生成绩管理系统代码(Qt).zip

#include "searchinfolessons.h" #include "ui_searchinfolessons.h" searchInfoLessons::searchInfoLessons(QWidget *parent) : QWidget(parent), ui(new Ui::searchInfoLessons) { this->setFixedSize(1065,727); ui->setupUi(this); this->setWindowIcon(QIcon("image/windowLable.jpg")); this->setWindowTitle("课程信息"); //设置背景图 QMovie *movie_back = new QMovie("image/addLesson.gif"); ui->label_3->setMovie(movie_back); ui->label_3->setScaledContents(true); movie_back->start(); model_lesson = new QSqlTableModel; model_lesson->setTable("lessons"); model_lesson->setEditStrategy(QSqlTableModel::OnManualSubmit); ui->tableView->setModel(model_lesson); //添加系别信息到combox ui->comboBox_depart->addItem("建筑学院"); ui->comboBox_depart->addItem("土木工程系"); ui->comboBox_depart->addItem("建设管理系"); ui->comboBox_depart->addItem("水利工程系"); ui->comboBox_depart->addItem("机械工程系"); ui->comboBox_depart->addItem("自动化系"); ui->comboBox_depart->addItem("电子工程系"); ui->comboBox_depart->addItem("计算机科学与技术系"); ui->comboBox_depart->addItem("物理系"); ui->comboBox_depart->addItem("数学系"); ui->comboBox_depart->addItem("化学系"); } searchInfoLessons::~searchInfoLessons() { delete ui; } void searchInfoLessons::on_pushButton_clicked() { //事务操作 model_lesson->database().transaction(); if(model_lesson->submitAll()) { model_lesson->database().commit(); QMessageBox::warning(this,tr("change"),tr("修改已被提交!")); if(model_lesson->tableName() == "lessons") { //创建一个lesson表记录选择此课的人 QSqlQuery query; QString ID_; for(int i=0;i<model_lesson->rowCount();i++) { ID_ = ui->tableView->model()->data(ui->tableView->model()->index(i,0)).toString(); query.exec(QString("CREATE TABLE '%1'(ID INT PRIMARY KEY NOT NULL, grades VCHAR)").arg("LESSONS"+ID_)); } } } else { model_lesson->database().rollback(); QMessageBox::warning(this,tr("tableModel"),tr("数据库错误! %1").arg(model_lesson->database().lastError().text())); } } void searchInfoLessons::on_pushButton_2_clicked() { this->model_lesson->revertAll(); } void searchInfoLessons::on_pushButton_8_clicked() { model_lesson->setTable("lessons"); model_lesson->select(); } void searchInfoLessons::on_pushButton_3_clicked() { int rows = model_lesson->rowCount(); int id = -1; model_lesson->insertRow(rows); model_lesson->setData(model_lesson->index(rows,0),id); } void searchInfoLessons::on_pushButton_4_clicked() { int selected_row = ui->tableView->currentIndex().row(); model_lesson->removeRow(selected_row); int is_delete = QMessageBox::warning(this,tr("删除"),tr("你确定删除当前行?"),QMessageBox::Yes,QMessageBox::No); if(is_delete == QMessageBox::Yes) { model_lesson->submitAll(); } else { model_lesson->revertAll(); } } void searchInfoLessons::on_pushButton_5_clicked() { model_lesson->setFilter(QString("Name = '%1'").arg(ui->lineEdit_search_name->text())); model_lesson->select(); } void searchInfoLessons::on_pushButton_6_clicked() { model_lesson->setFilter(QObject::tr("courseID = '%1'").arg(ui->lineEdit_search_number->text().toInt())); model_lesson->select(); } void searchInfoLessons::on_pushButton_7_clicked() { if(model_lesson->tableName() == "lessons") { //提取所选课程的编号 QSqlQuery query_getID; query_getID.exec("SELECT * FROM lessons"); query_getID.seek(ui->tableView->currentIndex().row()); this->current_selected_lessonID = "LESSONS"+query_getID.value(0).toString(); //打开此课程的选课人数记录 model_lesson->setTable(this->current_selected_lessonID); model_lesson->setEditStrategy(QSqlTableModel::OnManualSubmit); model_lesson->select(); ui->tableView->setModel(model_lesson); //计算平均分 query_getID.exec(QString("SELECT * FROM '%1'").arg(this->current_selected_lessonID)); query_getID.first(); double sum_score=0; for(int i=0;i<model_lesson->rowCount();i++) { sum_score = sum_score + query_getID.value(1).toDouble(); query_getID.next(); } double average_score = sum_score/model_lesson->rowCount(); ui->lineEdit_average->setReadOnly(false); ui->lineEdit_average->setText(QString::number(average_score)); ui->lineEdit_average->setReadOnly(true); } else { QMessageBox::warning(this,tr("failed"),tr("请选择课程!")); } } void searchInfoLessons::on_pushButton_9_clicked() { QSqlQuery query; //获得总课程数 model_lesson->setTable("lessons"); model_lesson->select(); int all_lessons = model_lesson->rowCount(); //将课程选课情况表格转换为map QMap <QString,QString> *id_grades =new QMap<QString,QString>[all_lessons]; //更新行号到课程号的哈希表 query.exec("SELECT * FROM lessons"); rows_lessonsID.clear(); for(int i=0;i<all_lessons;i++) { query.seek(i); rows_lessonsID.insert(i,query.value(0).toInt()); } //将所有课的成绩写入哈希表里 QSqlTableModel model_getnumber; for(int i=0;i<all_lessons;i++) { query.exec(QString("SELECT * FROM '%1'").arg("LESSONS"+QString::number(rows_lessonsID[i]))); query.first(); //获取当前选课表的行数 model_getnumber.setTable("LESSONS"+QString::number(rows_lessonsID[i])); model_getnumber.select(); int currenttable_StudentNumber=model_getnumber.rowCount(); for(int j=0;j<currenttable_StudentNumber;j++) { id_grades[i].insert(query.value(0).toString(),query.value(1).toString()); qDebug()<<query.value(0).toString()<<query.value(1).toString(); query.next(); } } for(int i=0;i<all_lessons;i++) { QMap<QString,QString>::iterator _traversing; _traversing=id_grades[i].begin(); while(_traversing!=id_grades[i].end()) { //写入学生的课表 query.exec(QString("UPDATE '%1' SET grades='%2' WHERE courseID='%3' ") .arg("IDNAMESTUDENT"+_traversing.key()) .arg(_traversing.value()) .arg(QString::number(rows_lessonsID[i]))); qDebug()<<rows_lessonsID[i]<<_traversing.key()<<_traversing.value(); _traversing++; } } } void searchInfoLessons::on_pushButton_13_clicked() { if(model_lesson->tableName()!="lessons") { model_lesson->sort(1,Qt::DescendingOrder); model_lesson->select(); } else { QMessageBox::warning(this,tr("failed"),tr("当前表格错误!")); } } void searchInfoLessons::on_pushButton_12_clicked() { model_lesson->setFilter(QObject::tr("Depart = '%1'").arg(ui->comboBox_depart->currentText())); model_lesson->select(); }