QSqlDatabase retrieve connection in different form

[Lesiok]

If you opens db connection in 1.cpp file in 2.cpp file You use it like this :

QSqlDatabase customer = QSqlDatabase::database();
QSqlQuery qry1;
qr1.prepare(...);
...
customer.close();

QSqlDatabase customer = QSqlDatabase::database();
QSqlQuery qry1;
qr1.prepare(...);
...
customer.close();

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Reading the documentation does not hurt. From QSqlDatabase::QSqlDatabase doc : Creates an empty, invalid QSqlDatabase object. Use addDatabase(), removeDatabase(), and database() to get valid QSqlDatabase objects.