qt加载mysql表格数据

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlError>
#include <QTableView>
#include <QStandardItemModel>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 连接数据库
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("testdb");
    db.setUserName("username");
    db.setPassword("password");

    if (!db.open()) {
        qDebug() << "Error: connection with database failed";
        return -1;
    }

    // 创建模型
    QStandardItemModel *model = new QStandardItemModel();

    // 设置表头
    model->setColumnCount(3);
    model->setHorizontalHeaderLabels({"ID", "Name", "Age"});

    // 查询数据
    QSqlQuery query;
    query.exec("SELECT id, name, age FROM users");

    while (query.next()) {
        int id = query.value(0).toInt();
        QString name = query.value(1).toString();
        int age = query.value(2).toInt();

        QList<QStandardItem*> rowItems;
        rowItems << new QStandardItem(QString::number(id));
        rowItems << new QStandardItem(name);
        rowItems << new QStandardItem(QString::number(age));

        model->appendRow(rowItems);
    }

    // 创建表格视图
    QTableView *tableView = new QTableView();
    tableView->setModel(model);
    tableView->show();

    return a.exec();
}