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qt中mysql数据库经验总结_MySQL

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Release: 2016-06-01 13:08:20
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1.queryMenu.prepare("insert into ordering (desknum,foodname,foodprice) values(:desknumm,:foodname,:foodprice)"); //准备执行SQL查询queryMenu.bindValue(":desknumm", nid);   //在占位符上确定绑定的值queryMenu.bindValue(":foodname", foodnm);queryMenu.bindValue(":foodprice",fdprice);queryMenu.exec();
2.    QSqlQuery query;    query.exec("select * from employment where username="+str[0]);    query.exec("select * from employment where username=?");    query.bindValue(0,str[0]); //str[0]存放的是从界面获取的用户名    query.exec();
3.bool createConnection(){    QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL");   //连接数据库驱动    db.setUserName("zzp");    db.setPassword("zzp");    db.setHostName("localhost");  //数据库所在主机的IP,此处数据库保存在本地    db.setDatabaseName("ordersystem");//数据库名    db.setPort(3306);  //端口号    if(!db.open())    {        qDebug()    }    else    {        qDebug()

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