How does one use QSqlQuery pointer to connect to a database?

[zim]

How does one connect a database pointer to a sqlquery pointer. For example,

db = new QSqlDatabase(QSqlDatabase::addDatabase("QSQLITE"));
       qry = new QSqlQuery(*db);

db = new QSqlDatabase(QSqlDatabase::addDatabase("QSQLITE"));
       qry = new QSqlQuery(*db);

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