I don't understand why this code not executed when Qt development Framework not installed.

Qt Code: 
  1. ....
  2. ....
  3.  
  4. extern QSqlDatabase dbFav;
  5.  
  6. void DB::init() // this is static void
  7. {
  8.     QDir dir;
  9.     if (!dir.exists(CONF_PATH))
  10.         dir.mkpath(CONF_PATH);
  11.  
  12.     //favorite
  13.     dbFav=QSqlDatabase::addDatabase("QSQLITE", "favorite");
  14.     dbFav.setDatabaseName(QString("%1/favorite.%2").arg(CONF_PATH).arg(DB_SUFFIX));
  15.     dbFav.open();
  16.     QStringList tablesFav = dbFav.tables();
  17.     QSqlQuery queryFav(dbFav);
  18.     if (!tablesFav.contains("folder", Qt::CaseInsensitive)) {
  19.         queryFav.exec("CREATE TABLE folder ("
  20.                         "id integer primary key,"
  21.                         "nama text not null,"
  22.                         "id_induk int not null,"
  23.                         "unique(nama, id_induk)"
  24.                         ")");
  25.     }
  26. }
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