qt数据库和mysql数据库

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

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

    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setUserName("user");
    db.setPassword("password");
    db.setDatabaseName("mydb");

    if (!db.open()) {
        qDebug() << "Error: Unable to connect to MySQL database.";
        qDebug() << db.lastError().text();
        return -1;
    }

    QSqlQuery query;
    if (!query.exec("CREATE TABLE IF NOT EXISTS test (id INT PRIMARY KEY, name VARCHAR(50))")) {
        qDebug() << "Error: Unable to create table.";
        qDebug() << query.lastError().text();
        return -1;
    }

    if (!query.exec("INSERT INTO test (id, name) VALUES (1, 'John Doe')")) {
        qDebug() << "Error: Unable to insert data.";
        qDebug() << query.lastError().text();
        return -1;
    }

    qDebug() << "Database operations completed successfully.";

    return a.exec();
}