void
CrundDriver::disconnectDB(Load& load) {
    cout << endl
         << "------------------------------------------------------------"
         << endl
         << "close connection ... " << endl
         << "------------------------------------------------------------"
         << endl;
    load.closeConnection();
}
void
CrundDriver::reconnectDB(Load& load) {
    cout << endl
         << "------------------------------------------------------------"
         << endl
         << "renew connection ... " << endl
         << "------------------------------------------------------------"
         << endl;
    load.closeConnection();
    load.initConnection();
}