How to pass a db connection to another class in QT?

Question

Qt

How to pass a db connection to another class in QT?
Created a separate class for connecting to Sqlite DB.

SqliteConnection::SqliteConnection()
{

}

void SqliteConnection::OpenConnection(){
     db_sqlite = QSqlDatabase::addDatabase("QSQLITE");
     db_sqlite.setDatabaseName("samples.db");
     db_sqlite.open();
    if(db_sqlite.isOpen()){
        qDebug()<<"Ok";
    }
}
void SqliteConnection::CloseConnection(){
     db_sqlite.close();
}

I want to transfer connection to a DB to other classes. How to do it right?
sorry newbie. while much is not clear.

Answer 1

Usually a class is created to work with the database, it is a singleton, and it is passed or called already in the used class.
Either some single object pool is created, and they work through it