The first snippet I tried works fine:

QSqlQuery query("CALL GetOrderItems(323)", dataBase);
qDebug() << query.first();

It also returns the desired data and query.first() is true like expected.

Then I tried to insert the parameter using parameter binding like the Qt documentation proposes. I tried the following snippets. The first uses index placeholder the second keyword placeholder.

QSqlQuery query(dataBase);
qDebug() << query.prepare("CALL GetOrderItems(?)");
query.bindValue(0, 323);
qDebug() << query.exec();
qDebug() << query.first();

QSqlQuery query(dataBase);
qDebug() << query.prepare("CALL GetOrderItems(:myparam)");
query.bindValue(":myparam", 323);
qDebug() << query.exec();
qDebug() << query.first();

Both of these queries execute fine. But query.first() returns false so I don't know how to get the results.

Can I get the result from the binding queries in some way? Why doesn't this work?