iOS Question equivalent of cursor1.Position = cursor1.RowCount - 1

I used cursor.rowcount in android but can not find equivalent in B4i. following is what i want to achieve.
cursor1.Position = cursor1.RowCount - 1

or is there any other way to get to the last row in a table.
if i run "do while cursor.nextRow" loop then at the end of loop cursor.GetString give me null value