關於oracle的開放循環：找出;當前閱讀，下次閱讀，上次閱讀？

Question

FOR rec IN (SELECT t.* 
       FROM tableCustomers t 
       WHERE t.CustomerNo = p_Cust 
        AND t.NameNo = p_EkNo 
        AND t.Type = 1 
       ) 

    LOOP 
-- Here I need to know how to find out, 
-- the first read, the next read and the last read ? 
    END LOOP; 

Answer 1

FOR rec IN (SELECT t.*, 
        rownum as rn, 
        count(*) over() as cnt 
       FROM tableCustomers t 
       WHERE t.CustomerNo = p_Cust 
        AND t.NameNo = p_EkNo 
        AND t.Type = 1 
       ) 

    LOOP 
    if rec.rn==1 then 
    dbms_output.put_line('first line!'); 
    end if; 

    if rec.rn > 1 then 
    dbms_output.put_line('after first line!'); 
    end if; 

    if rec.rn = cnt then 
    dbms_output.put_line('lastline!'); 
    end if; 

    END LOOP;