void InitMultipleSQL()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("./lyshark.db");
     if (!db.open())
     {
            std::cout << db.lastError().text().toStdString()<< std::endl;
            return;
     }
 
    // 执行SQL创建表
    db.exec("DROP TABLE Student");
    db.exec("CREATE TABLE Student ("
                    "id INTEGER PRIMARY KEY AUTOINCREMENT, "
                    "name VARCHAR(40) NOT NULL, "
                    "age INTEGER NOT NULL)"
         );
 
    // 批量创建数据
    // https://www.cnblogs.com/lyshark
    QStringList name_list; name_list << "lyshark" << "lisi" << "wangwu";
    QStringList age_list; age_list << "25" << "34" << "45";
 
    // 绑定并插入数据
    QSqlQuery query;
    query.prepare("INSERT INTO Student(name,age) ""VALUES (:name, :age)");
 
    if(name_list.size() == age_list.size())
    {
        for(int x=0;x< name_list.size();x++)
        {
            query.bindValue(":name",name_list[x]);
            query.bindValue(":age",age_list[x]);
            query.exec();
        }
    }
 
    // ------------------------------------------------
    // 创建第二张表,与第一张表通过姓名关联起来
    db.exec("DROP TABLE StudentTimetable");
    db.exec("CREATE TABLE StudentTimetable("
            "id INTEGER PRIMARY KEY AUTOINCREMENT, "
            "name VARCHAR(40) NOT NULL, "
            "timetable VARCHAR(128) NOT NULL"
            ")");
 
    db.exec("INSERT INTO StudentTimetable(name,timetable) VALUES ('lyshark','AAA')");
    db.exec("INSERT INTO StudentTimetable(name,timetable) VALUES ('lyshark','BBB')");
    db.exec("INSERT INTO StudentTimetable(name,timetable) VALUES ('lyshark','CCC')");
 
    db.exec("INSERT INTO StudentTimetable(name,timetable) VALUES ('lisi','QQQ')");
    db.exec("INSERT INTO StudentTimetable(name,timetable) VALUES ('lisi','WWW')");
 
    db.exec("INSERT INTO StudentTimetable(name,timetable) VALUES ('wangwu','EEE')");
 
    db.commit();
    db.close();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <iostream>
#include <QStringList>
#include <QString>
#include <QVariant>
#include <QDataWidgetMapper>
#include <QtSql>
#include <QStandardItem>
#include <QStringList>
#include <QStringListModel>
 
QSqlQueryModel *qryModel;          // 数据模型
QItemSelectionModel *theSelection; // 选择模型
QDataWidgetMapper *dataMapper;     // 数据界面映射
 
MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("./lyshark.db");
     if (!db.open())
     {
            std::cout << db.lastError().text().toStdString()<< std::endl;
            return;
     }
 
     // 查询数据表中记录
     qryModel=new QSqlQueryModel(this);
     qryModel->setQuery("SELECT * FROM Student ORDER BY id");
     if (qryModel->lastError().isValid())
     {
         return;
     }
 
     // 设置TableView表头数据
     qryModel->setHeaderData(0,Qt::Horizontal,"ID");
     qryModel->setHeaderData(1,Qt::Horizontal,"Name");
     qryModel->setHeaderData(2,Qt::Horizontal,"Age");
 
     // 将数据绑定到模型上
     theSelection=new QItemSelectionModel(qryModel);
     ui->tableView->setModel(qryModel);
     ui->tableView->setSelectionModel(theSelection);
     ui->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
 
     // 创建数据映射
     dataMapper= new QDataWidgetMapper();
     dataMapper->setSubmitPolicy(QDataWidgetMapper::AutoSubmit);
     dataMapper->setModel(qryModel);
     dataMapper->addMapping(ui->lineEdit_id,0);
     dataMapper->addMapping(ui->lineEdit_name,1);
     dataMapper->addMapping(ui->lineEdit_age,2);
     dataMapper->toFirst();
 
     // 绑定信号,当鼠标选择时,在底部编辑框中输出
     // https://www.cnblogs.com/lyshark
     connect(theSelection,SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),this,SLOT(on_currentRowChanged(QModelIndex,QModelIndex)));
}
 
MainWindow::~MainWindow()
{
    delete ui;
}

// 鼠标点击后的处理槽函数
void MainWindow::on_currentRowChanged(const QModelIndex &current, const QModelIndex &previous)
{
    Q_UNUSED(previous);
    if (!current.isValid())
    {
        return;
    }
 
    dataMapper->setCurrentModelIndex(current);
 
    // 获取到记录开头结尾
    bool first=(current.row()==0);                    // 是否首记录
    bool last=(current.row()==qryModel->rowCount()-1);// 是否尾记录
    std::cout << "IsFirst: " << first << "IsLast: " << last << std::endl;
 
 
    // 获取name字段数据
    int curRecNo=theSelection->currentIndex().row();  // 获取当前行号
    QSqlRecord curRec=qryModel->record(curRecNo);     // 获取当前记录
    QString uname = curRec.value("name").toString();
    std::cout << "Student Name = " << uname.toStdString() << std::endl;
 
    // 查StudentTimetable表中所有数据
    // 根据姓名过滤出该用户的所有数据
    QSqlQuery query;
    query.prepare("select * from StudentTimetable where name = :x");
    query.bindValue(":x",uname);
    query.exec();
 
    // 循环获取该用户的数据,并将timetable字段提取出来放入QStringList容器
    // https://www.cnblogs.com/lyshark
    QSqlRecord rec = query.record();
    QStringList the_data;
 
    while(query.next())
    {
        int index = rec.indexOf("timetable");
        QString data = query.value(index).toString();
 
        std::cout << "User timetable = " << data.toStdString() << std::endl;
        the_data.append(data);
    }
 
    // 关联到ListView数据表中
    QStringListModel *model;
    model = new QStringListModel(the_data);
    ui->listView->setModel(model);
    ui->listView->setEditTriggers(QAbstractItemView::NoEditTriggers);
}

// 刷新tableView的当前选择行
// https://www.cnblogs.com/lyshark
void MainWindow::refreshTableView()
{
    int index=dataMapper->currentIndex();
    QModelIndex curIndex=qryModel->index(index,0);      // 定位到低0行0列
    theSelection->clearSelection();                     // 清空选择项
    theSelection->setCurrentIndex(curIndex,QItemSelectionModel::Select);//设置刚插入的行为当前选择行
}
 
// 第一条记录
void MainWindow::on_pushButton_clicked()
{
    dataMapper->toFirst();
    refreshTableView();
}
// 最后一条记录
void MainWindow::on_pushButton_2_clicked()
{
    dataMapper->toLast();
    refreshTableView();
}
 
// 前一条记录
void MainWindow::on_pushButton_3_clicked()
{
    dataMapper->toPrevious();
    refreshTableView();
}
 
// 下一条记录
void MainWindow::on_pushButton_4_clicked()
{
    dataMapper->toNext();
    refreshTableView();
}