Cursors and transactions

Sorry for my english,
Some one can help me about this PL-Sql function.

I would like know if a write this :

....
CURSOR c_test IS
 SELECT id, errore
  FROM messagges;

.....
INSERT INTO messages VALUES (100, 'error 1'); ....
INSERT INTO messages VALUES (101, 'error 2'); ...
<< some others statments>>
...
OPEN c_test;
ROLLBACK;
->> here I see again my rows ? Is it possibile to a do a loop on that
cursor o
the rollback delete also in memory my rows ?

Thanks

-- 
Andrea
A.Savino_at_stm.it