Like a session in PHP

[wirasto]

I'm so impressed with QSqlDatabase. If I set like this..

QSqlDatabase db=QSqlDatabase::addDatabase(...);
db.setHostName("abc");

QSqlDatabase db=QSqlDatabase::addDatabase(...);
db.setHostName("abc");

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Then, I can get value "abc" in everywhere with

qDebug() << QSqlDatabase::database().hostName()

qDebug() << QSqlDatabase::database().hostName()

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I think that is like set $_SESSION["hostName"]="abc" in PHP.
How to create like that with Qt ?