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  • QT数据库操作

    QT连接数据库,在pro文件中加上QT += sql

    连接数据库

    QSqlDatabase OpenDB()
    {
        QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");
        // 注意,对于express版本数据库, 一定要加\sqlexpress这种后缀
        //    QString dsn="DRIVER={SQL SERVER};SERVER=192.168.24.71\sqlexpress;DATABASE=wdgl";
        QString url="DRIVER={SQL SERVER};SERVER=192.168.24.71;DATABASE=wdgl";
        db.setDatabaseName(url);
        db.setUserName("sa");
        db.setPassword("sa");
        if(!db.open())
        {
            qDebug("Error:%s",qPrintable(db.lastError().text()));
            return db;
        }
        qDebug()<<"Database connected sucessfully!";
        qDebug() << "ODBC driver valid?" << db.isValid();//连接成功输出true
        QSqlQuery query;
        return db;
    }


    增删改操作

    QSqlQuery query;
        qDebug()<<query.exec("insert into wdgl_user (note,password,username)values('user...','123456','admin')");//执行成功输出true

    qDebug()<<query.exec("delete from wdgl_user where user_id = 1");//执行成功显示true
    qDebug()<<query.exec("update wdgl_user set username = 'umgsai' where user_id = 2");//执行成功显示true

    查询操作

    void MainWindow::on_pushButton_clicked()
    {
        QSqlQueryModel *model = new QSqlQueryModel;
        model->setQuery("select * from wdgl_user");
        model->setHeaderData(0, Qt::Horizontal, tr("用户id"));
        model->setHeaderData(1, Qt::Horizontal, tr("用户说明"));
        model->setHeaderData(2, Qt::Horizontal, tr("密码"));
        model->setHeaderData(3, Qt::Horizontal, tr("用户名"));
        QTableView *view = new QTableView;//弹出对话框
        view->setGeometry(200,200,450,800);
        view->setWindowTitle("用户列表");
        view->setMinimumSize(450,800);//设置不可改变大小
        view->setMaximumSize(450,800);
        view->setModel(model);
        view->show();
    }


    本文出自 “阿凡达” 博客,请务必保留此出处http://shamrock.blog.51cto.com/2079212/1411180

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  • 原文地址:https://www.cnblogs.com/umgsai/p/3908087.html
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