How to correctly close a database connection

[anoraxis]

Hi and thank you. Your solution works well but I don't want to create a QSqlDatabase every time I need to make a query so I solved the problem using another solution.

Instead of removing the QSqlDatabase instance from my class I modified the destructor of the class. Now it looks like

DAO::~DAO()
{
    this->db = QSqlDatabase();
    QSqlDatabase::removeDatabase(this->connName);
}

DAO::~DAO()
{
    this->db = QSqlDatabase();
    QSqlDatabase::removeDatabase(this->connName);
}

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On the firts instruction of the destructor, the reference to my database is destroyed so now I can remove the database with the removeDatabase function. Tested and working perfect: all the warnings gone!

[mcosta]

QSqlDatabase uses Implicit data sharing in order to minimize copying.

Using my version (suggested by Qt) you copy very small amount of data