working with SQLite

[bhs-ittech]

I'm wondering if you can take some SQLite databases setup like this:

QSqlDatabase sql = QSqlDatabase::addDatabase("QSQLITE","pva");
sql.setDatabaseName("pva.db");
 
QSqlDatabase sql2 = QSqlDatabase::addDatabase("QSQLITE","pva-cache");
sql2.setDatabaseName(":memory:");

QSqlDatabase sql = QSqlDatabase::addDatabase("QSQLITE","pva");
sql.setDatabaseName("pva.db");

QSqlDatabase sql2 = QSqlDatabase::addDatabase("QSQLITE","pva-cache");
sql2.setDatabaseName(":memory:");

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and then "copy" the one to the other?

and is there a way to store a ":memory:" database
as a file when done working with it?