problem with QSQLITE.

[Con Nít]

I saw QT's project example cachedtable.

In that write is :

QSqlDatabase::database("in_mem_db", false).close();
        QSqlDatabase::removeDatabase("in_mem_db");
        QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", "in_mem_db");
        db.setDatabaseName(":memory:");

QSqlDatabase::database("in_mem_db", false).close();
        QSqlDatabase::removeDatabase("in_mem_db");
        QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", "in_mem_db");
        db.setDatabaseName(":memory:");

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Where did Database created ?

when I want to backup this data, what do I do ?

thank and best regards !