removing database

[mak_user]

What is wrong with this code. Why I get warning about it?
WARNING: QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.

{
QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};FIL={MSAccess};DBQ=E:file.name" );
    qDebug() << "DRIVERS :" << QSqlDatabase::drivers();
 
    if (!db.open()) {
       qDebug()<< db.lastError().text();
       return false;
     }
}
 
if(QSqlDatabase::database().isOpen()) {
        qDebug() << "db name :" << QSqlDatabase::database().connectionName();
        QSqlDatabase::database().close();
        QSqlDatabase::removeDatabase(QSqlDatabase::database().connectionName());
    }

{
QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};FIL={MSAccess};DBQ=E:file.name" );
    qDebug() << "DRIVERS :" << QSqlDatabase::drivers();

    if (!db.open()) {
       qDebug()<< db.lastError().text();
       return false;
     }
}

if(QSqlDatabase::database().isOpen()) {
        qDebug() << "db name :" << QSqlDatabase::database().connectionName();
        QSqlDatabase::database().close();
        QSqlDatabase::removeDatabase(QSqlDatabase::database().connectionName());
    }

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[mak_user]

Should I leave this warning as it is?
Because I need to close connection and open new one to another database.

[joyer83]

Do you have any QSqlQuery objects alive when you try to remove the connection? If you have, then that would cause the warning.

[DanH]

Yep, you probably have a QSqlQuery object that hasn't passed out of scope and hasn't been clear()ed.