#include <QApplication>
#include <QSqlDatabase>
#include <QDebug>
#include <QMessageBox>
#include <QSqlQuery>
#include <QVariant>
#include <QTime>
#include <QTextCodec>
void writeExcel(QString excelFilePath)
{
    // 创建一个数据库实例， 设置连接字符串
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC","excelexport");
    QString dsn = QString("DRIVER={Microsoft Excel Driver (*.xls)};DSN=‘‘; FIRSTROWHASNAMES=1; READONLY=FALSE;CREATE_DB=\"%1\";DBQ=%2").
            arg(excelFilePath).arg(excelFilePath);
    db.setDatabaseName(dsn);
    // 打开数据库
    if (!db.open())
    {
        qDebug()<< "open false";
        QMessageBox::about(NULL, "r", "open false");
    }
    // 创建表格
    QString sql = "create table sheet (name TEXT, age NUMBER)";
    QSqlQuery query(db);
    if (!query.exec(sql))
    {
        qDebug()<< "create table false！";
        QMessageBox::about(NULL, "r", "create table false！");
    }
    // 写入数据
    db.exec( "insert into sheet(name, age) values(‘ctb‘, ‘28‘)");
    db.exec( "insert into sheet(name, age) values(‘xw‘, ‘19‘)");
    db.exec( "insert into sheet(name, age) values(‘lg‘, ‘34‘)");
    // 关闭数据库
    db.close();
}
void readExcel(const QString excelPath)
{
    // excel 数据库连接字符串 须要QODBC 驱动
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC","excelexport");
    QString connString = QString("Driver={Microsoft Excel Driver (*.xls)};Readonly=1;DriverId=790;Dbq=%1;DefaultDir=D:\\").arg(excelPath);
    db.setDatabaseName(connString);
    // 打开数据库
    if (!db.open())
    {
        qDebug()<< "open false";
        QMessageBox::about(NULL, "r", "open false");
    }
    //查询数据
    QString sql = "Select * from [sheet$]";
    QSqlQuery query(sql, db);
    while (query.next()) {
        //读取数据
        QString name = query.value(0).toString();
        int age = query.value(1).toInt();
        qDebug()<< name << age <<endl;
    }
    // 关闭数据库
    db.close();
}
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //中文支持
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("system"));
    QTextCodec::setCodecForTr(QTextCodec::codecForName("system"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("system"));
    writeExcel("D:\\test01.xls");
    readExcel("D:\\test01.xls");
    return a.exec();
}
写入结果：

读取打印结果：