1.
queryMenu.prepare("insert into ordering (desknum,foodname,foodprice) values(:desknumm,:foodname,:foodprice)"); //準備執行SQL查詢
queryMenu.bindValue(":desknumm", nid); //在佔位符上確定綁定的值
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]存放的是從界面獲取的用戶名
query.exec();
3.
bool createConnection()
{
QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL"); //連接數據庫驅動
db.setUserName("zzp");
db.setPassword("zzp");
db.setHostName("localhost"); //數據庫所在主機的IP，此處數據庫保存在本地
db.setDatabaseName("ordersystem");//數據庫名
db.setPort(3306); //端口號
if(!db.open())
{
qDebug()<<"Failed to connect to root mysql admin";
}
else
{
qDebug()<<"open database successful!";
return true;
}
}