Something good to read about QSqlDatabase

[spirit]

the first:
what is this?

...
db->QSqlDatabase::addDatabase("QPSQL");
...

...
db->QSqlDatabase::addDatabase("QPSQL");
...

To copy to clipboard, switch view to plain text mode 

I didn't see where you create object using operator new.

the second:
you shouldn't use pointer to database, because QSqlDatabase class is shared.
so, I suggest you to revise you code: refuse using pointer to database (but if you prefer
to use pointer then you must use new operator)

you can also not to keep variable for database like a class member, you can always get a needed database object using

QSqlDatabase QSqlDatabase::database ( const QString & connectionName = QLatin1String( defaultConnection ), bool open = true )

QSqlDatabase QSqlDatabase::database ( const QString & connectionName = QLatin1String( defaultConnection ), bool open = true )

To copy to clipboard, switch view to plain text mode 

conclusion:
you can use the following code

void someObject::initDatabse
{
     QSqlDatabese db = QSqlDatabse::addDatabase("QPSQL", "myConnection");
     .....//do connection stuff
}
 
void someObject::execQuery(const QString &queryText)
{
    QSqlDatabse db = QSqlDatabase::database("myConnection");
    QSqlQuery query(db);
    query.prepare(queryText);
    ....
}

void someObject::initDatabse
{
     QSqlDatabese db = QSqlDatabse::addDatabase("QPSQL", "myConnection");
     .....//do connection stuff
}

void someObject::execQuery(const QString &queryText)
{
    QSqlDatabse db = QSqlDatabase::database("myConnection");
    QSqlQuery query(db);
    query.prepare(queryText);
    ....
}

To copy to clipboard, switch view to plain text mode