在QT中使用MySQL数据库

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlError>
#include <QDebug>

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

    // 初始化数据库连接
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("your_database_name");
    db.setUserName("your_username");
    db.setPassword("your_password");

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

    qDebug() << "Database: connection ok";

    // 执行查询
    QSqlQuery query;
    query.exec("SELECT * FROM your_table_name");

    while (query.next()) {
        QString name = query.value(0).toString();
        int age = query.value(1).toInt();
        qDebug() << "Name:" << name << "Age:" << age;
    }

    return a.exec();
}