rollback not working.

hello experts, i am trying to run create table, insert records and delete records in a table made in Oracle.
but once i have delted few records thru this program, i am not able to get them back by running RollBack command at sql prompt of Oracle 8. i m using connection string to connect to oracle. other things are working fine. I am providing the code below. please help. i wish to get the records back by using Rollback.
the code follows :

Option Explicit
Dim con As ADODB.Connection
Dim rs As ADODB.Recordset
Dim cmd As ADODB.Command
Dim sql As String, i As Integer

Private Sub Form_Load()
    Set con = New ADODB.Connection
    Set rs = New ADODB.Recordset
    Set cmd = New ADODB.Command
    con.ConnectionString = "Provider=MSDAORA.1;User ID=scott/tiger;Persist Security Info=False"

    con.Open
    cmd.ActiveConnection = con
    i =1
End Sub

Private Sub cmdCreateTable_Click()
 cmd.ActiveConnection = con
cmd.CommandText="Create table tempp(rno number")
    cmd.Execute
    Print "Table Created !"
End Sub

Private Sub cmdInsert_Click()
    sql = "Insert into tempp values(1)
    cmd.CommandText = sql
    cmd.Execute    

    sql = "Insert into tempp values(2)
    cmd.CommandText = sql
    cmd.Execute    

    sql = "Insert into tempp values(3)
    cmd.CommandText = sql
    cmd.Execute    
End Sub

Private Sub cmd_delete_Click()
' delete few records
cmd.CommandText = "Delete tempp where rno>1"
    cmd.Execute
    Print "Records  Deleted !"
''''''''' Here is the Problem  ''''''''''
End Sub

The records deleted thru Vb cant be recalled even after rollback is issued from SQL.