基于qt和mysql的学生注册系统（一）

这学期开了数据库的课，之前也有同学找过我做个类似的东西，但当时不会....
言归正转，
开发环境：ubuntu10.10
ide：qtcreator
数据库：mysql
实现功能：链接数据库，用户登录，数据添加，删除，查询，修改，删除，文件输出。
效果如下：







关于环境的配置在我之前的一篇文章里已经写了，没配置好的可以参照一下。
需要用到的一些qt的知识：
mv架构，qsql类的一些东西。
qt有自己的一套数据库处理的方式，我还是偏向sql语句。
文件组织：



上代码：
先上mainwindow类，主要是页面的布局。

mainwindow.h

#ifndef MAINWINDOW_H #define MAINWINDOW_H  #include <QtGui/QMainWindow> #include <QMenuBar> #include <QPushButton> #include <QWidget> #include <QPainter> #include <QLabel> #include <QScrollArea> #include <QAction> #include <QFileDialog> #include <QMessageBox> #include <QHBoxLayout> #include <QVBoxLayout> #include <QTextEdit> #include <QIcon> #include <QToolBar> #include <QLabel> #include <QStatusBar> #include <QLayout> #include <QPainter> #include <QList> #include <QSqlTableModel> #include <QTableView> #include <QDebug> #include <QSqlQuery> #include <QVariant> #include <QStringList> #include <QInputDialog> #include <QComboBox> #include <QDialogButtonBox> #include <QGridLayout> #include <QFileDialog> #include <QStringList> #include <QFile> #include <QVector> #include <QPoint>  #include <QSqlRecord> #include"add.h" #include"mod.h" #include"search.h" #include <QDesktopServices> #include <QSystemTrayIcon>  class MainWindow : public QMainWindow {      Q_OBJECT public:     MainWindow(QWidget *parent = 0);     ~MainWindow();     void createMenus();//生成菜单     void createActions();//生成动作     void createToolBars();//生成工具栏     void createButtons();//生成按键     static QVector<QString> classes;   private:        QGridLayout *grid;     QSqlQueryModel *model;     QMenu *fileMenu;     QMenu *helpMenu;     QMenu *aboutMenu;     QToolBar *tool;     QAction *saveAction;     QAction *aboutAction;     QAction *exitAction;     QAction *helpAction;     QAction *searchAction;     QAction *deleteAction;     QAction *backAction;     QAction *addAction;     QAction *rankAction;     QAction *modifyAction;     QLabel *msgLabel;//状态栏显示     QLabel *about;//关于     QPushButton *modifyBtn;     QPushButton *rankBtn;     QTableView *tableView;     QDialogButtonBox *buttonBox;     QPoint *p; public slots:     void slotAbout();//关于我们     void slotHelp();//帮助     bool slotAdd();//增加     void slotDelete();//删除元组     void slotBack();//返回     void slotSearch();//搜索     void slotModify();//修改     void slotRank();//排序     void slotSave();//储存 };  #endif // MAINWINDOW_H

mainwindow.cpp

//mainwindow.cpp #include "mainwindow.h" QVector<QString> MainWindow::classes;  MainWindow::MainWindow(QWidget *parent)     : QMainWindow(parent) {      setGeometry(100,100,1000,768);     setWindowTitle(tr("Student Registration System"));     //状态栏设定     msgLabel=new QLabel;     msgLabel->setMinimumSize(msgLabel->sizeHint());     statusBar()->addWidget(msgLabel);     createActions();     createMenus();     createToolBars();     //createButtons();     tableView= new QTableView(this);     QHBoxLayout *main_lay=new QHBoxLayout;     main_lay->addWidget(tableView);     //main_lay->addLayout(bt_lay);       QWidget *centreWidget=new QWidget(this);     centreWidget->setLayout(main_lay);     setCentralWidget(centreWidget);      model = new QSqlQueryModel(this);     model->setQuery("select * from Student");     tableView->setModel(model);     QVector<QString> cla;     QSqlQuery query;     query.exec("select classNo from Class");     qDebug()<<query.size();     while(query.next())     {         cla.append(query.value(0).toString());     }     classes=cla;     qDebug() << "main:"<<classes.size(); }  MainWindow::~MainWindow() {  }  void MainWindow::createActions() {     //about action     aboutAction=new QAction(tr("&About"), this);     aboutAction->setIcon(QIcon(":resources/2.png"));     aboutAction->setStatusTip(tr("OAbout me."));     connect(aboutAction,SIGNAL(triggered()),this,SLOT(slotAbout()));      //help action     helpAction=new QAction(tr("&Help"),this);     helpAction->setStatusTip("Help");     connect(helpAction,SIGNAL(triggered()),this,SLOT(slotHelp()));      //back action     backAction=new QAction(tr("&Back"),this);     backAction->setIcon(QIcon(":resources/7.png"));     backAction->setStatusTip("Back");     connect(backAction,SIGNAL(triggered()),this,SLOT(slotBack()));      //add action     addAction=new QAction(tr("&Add"),this);     addAction->setIcon(QIcon(":resources/1.png"));     addAction->setStatusTip("Add");     connect(addAction,SIGNAL(triggered()),this,SLOT(slotAdd()));      //search action     searchAction=new QAction(tr("&Search"),this);     searchAction->setIcon(QIcon(":resources/3.png"));     searchAction->setStatusTip("search");     connect(searchAction,SIGNAL(triggered()),this,SLOT(slotSearch()));      //delete action     deleteAction=new QAction(tr("&delete"),this);     deleteAction->setIcon(QIcon(":resources/9.png"));     deleteAction->setShortcuts(QKeySequence::Delete);     deleteAction->setStatusTip("delete");     connect(deleteAction,SIGNAL(triggered()),this,SLOT(slotDelete()));      //exit Action     exitAction = new QAction(tr("E&xit"), this);    // exitAction = new QAction(tr("E&xit"), this);     exitAction->setShortcuts(QKeySequence::Quit);     connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));      ///rank Action     rankAction=new QAction(tr("&rank"),this);     rankAction->setIcon(QIcon(":resources/10.png"));     rankAction->setStatusTip("rank");     connect(rankAction,SIGNAL(triggered()),this,SLOT(slotRank()));      //modify Action     modifyAction=new QAction(tr("&modify"),this);     modifyAction->setIcon(QIcon(":resources/11.png"));     modifyAction->setStatusTip("modify");     connect(modifyAction,SIGNAL(triggered()),this,SLOT(slotModify()));      //save Action     saveAction=new QAction(tr("&save File"),this);     saveAction->setStatusTip("Save file");     saveAction->setShortcut(QKeySequence::Save);     saveAction->setIcon(QIcon(":resources/12.png"));     connect(saveAction,SIGNAL(triggered()),this,SLOT(slotSave())); } void MainWindow::slotAbout() {     QMessageBox msg(this);     msg.setWindowTitle("About");     msg.setText(tr("Version:1.0"));     msg.exec(); } void MainWindow::slotHelp() {     QMessageBox msg(this);     msg.setWindowTitle("Help");     msg.setText(tr("Email:k283228391@126.com"));     msg.exec(); } void MainWindow::slotBack() {     model->setQuery("select * from Student");    tableView->update(); } void MainWindow::slotDelete() {      int i=tableView->currentIndex().row();     QVariant j=model->record(i).value(0);     qDebug()<<"currentIndex().data:"<<j;//tableView->indexAt(*p).data();     int b=QMessageBox::question(this,"Attention",tr("Delete row %1?").arg(i+1),QMessageBox::Yes,QMessageBox::Cancel);     qDebug()<<"b:"<<b;//output the value return yes:16384,cancel:4194304     if(b==16384)     {         QSqlQuery queryDel;        queryDel.prepare("delete from Student where Sno=?");        queryDel.addBindValue(j.toString());        queryDel.exec();        model->setQuery("select * from Student");     } } void MainWindow::slotSave() {     this->setWindowOpacity(0.7);     QFileDialog *fileDialog = new QFileDialog(this);     fileDialog->setAcceptMode(QFileDialog::AcceptSave);     fileDialog->setWindowTitle(tr("Save"));     QString s=QDesktopServices::storageLocation(QDesktopServices::DesktopLocation);     fileDialog->setDirectory(s);     fileDialog->setFilter(tr("Txt(*.txt)"));     if(fileDialog->exec() == QDialog::Accepted)     {         QString path = fileDialog->selectedFiles()[0];         if(path.right(3)!="txt")// 修改扩展名         {             path.append(".txt");         }         QFile file(path);         if (file.open(QIODevice::WriteOnly)) {             QSqlQuery query;exitAction->setShortcuts(QKeySequence::Quit);             query.exec("select * from Student");             QTextStream stream( &file );             stream << "Student information: "<< "/n";//in ubuntu             stream <<"Number"<<"/t"<<"Name"<<"/t"<<"Sex"<<"/t"<<"Age"<<"/t"<<"Hometown"<<"/t"<<"classNumber"<<"/n";             while(query.next())              {                  stream << query.value(0).toInt() <<"/t"<<query.value(1).toString()<</                          "/t"<<query.value(2).toString()<<"/t"<<query.value(3).toInt()<<"/t"/                          <<query.value(4).toString()<<"/t/t"<<query.value(5).toString()<<"/n";              }              file.close();         }     }     else     {         QMessageBox::information(NULL, tr("Path"), tr("You didn't select any files."));     }     this->setWindowOpacity(1.0);  } bool MainWindow::slotAdd() {     this->setWindowOpacity(0.7);     add dlg;     if(dlg.exec()==QDialog::Accepted)     {         dlg.Createsql();         model->setQuery("select * from Student");         tableView->update();     }     setWindowOpacity(1.0); } void MainWindow::slotModify() {      int i=tableView->currentIndex().row();     int k=tableView->currentIndex().column();     QVariant j= model->record(i).value(0);     QVariant h=model->headerData(k,Qt::Vertical);//get the headdata of the column     qDebug()<<"currentIndex().data:"<<h;      this->setWindowOpacity(0.7);     mod dlg;     if(dlg.exec()==QDialog::Accepted)     {         if(dlg.Createsql(h.toInt(),j))         {            qDebug()<<"Yse!";         }         else         {             qDebug()<<"No";         }         model->setQuery("select * from Student");         tableView->update();     }     setWindowOpacity(1.0); } void MainWindow::slotRank() {     //QDialog dlg;     this->setWindowOpacity(0.7);     QStringList list;     bool ok;     list<<tr("")<<tr("No.")<<tr("sex")<<tr("age")<<tr("class");     QString s=QInputDialog::getItem(this,tr("Search Inoformation:"),tr("Choose:"),list,0,false,&ok);     qDebug()<<s;     if(s=="age")     {         model->setQuery("select * from Student order by Sage");     }     else if(s=="No.")     {         model->setQuery("select * from Student order by Sno");     }     else if(s=="class")     {         model->setQuery("select * from Student order by classNo");     }      setWindowOpacity(1.0); } void MainWindow::slotSearch() {     this->setWindowOpacity(0.7);     search sch;     if(sch.exec()==QDialog::Accepted)//if accept,create a sql sentance;     {         QString s;         s=sch.searchSql();         qDebug()<<s;         model->setQuery(s);         tableView->update();     }       setWindowOpacity(1.0); }  void MainWindow::createToolBars() {     tool=addToolBar(tr("&File"));     tool->addAction(addAction);     tool->addAction(searchAction);     tool->addSeparator();     tool->addAction(deleteAction);     tool->addAction(backAction);     tool->addAction(rankAction);     tool->addAction(modifyAction);     tool->addAction(saveAction); }  void MainWindow::createMenus() {     fileMenu=menuBar()->addMenu(tr("&File"));     fileMenu->addAction(saveAction);     fileMenu->addAction(exitAction);      helpMenu=menuBar()->addMenu(tr("&Help"));     helpMenu->addAction(helpAction);      aboutMenu=menuBar()->addMenu(tr("&About"));     aboutMenu->addAction(aboutAction);  } void MainWindow::createButtons() {     modifyBtn=new QPushButton(tr("modify"));     connect(modifyBtn,SIGNAL(clicked()),this,SLOT(slotModify()));     rankBtn=new QPushButton(tr("rank"));     connect(rankBtn,SIGNAL(clicked()),this,SLOT(slotRank())); }