qt对mysql的增删改查

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

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("root");
    db.setPassword("password");

    if (!db.open()) {
        qDebug() << "无法连接到数据库";
        return -1;
    }

    qDebug() << "成功连接到数据库";

    // 其他操作...

    return a.exec();
}

QSqlQuery query;
query.prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
query.bindValue(":name", "John Doe");
query.bindValue(":email", "john.doe@example.com");

if (query.exec()) {
    qDebug() << "插入成功";
} else {
    qDebug() << "插入失败:" << query.lastError().text();
}

QSqlQuery query;
query.prepare("SELECT * FROM users");
if (query.exec()) {
    while (query.next()) {
        QString name = query.value("name").toString();
        QString email = query.value("email").toString();
        qDebug() << "Name:" << name << "Email:" << email;
    }
} else {
    qDebug() << "查询失败:" << query.lastError().text();
}

QSqlQuery query;
query.prepare("UPDATE users SET email = :email WHERE name = :name");
query.bindValue(":email", "new.email@example.com");
query.bindValue(":name", "John Doe");

if (query.exec()) {
    qDebug() << "更新成功";
} else {
    qDebug() << "更新失败:" << query.lastError().text();
}

QSqlQuery query;
query.prepare("DELETE FROM users WHERE name = :name");
query.bindValue(":name", "John Doe");

if (query.exec()) {
    qDebug() << "删除成功";
} else {
    qDebug() << "删除失败:" << query.lastError().text();
}