使用2個明確的遊標。

Question

* /我試圖用2個明確的指針，它顯示了這些錯誤

{：錯誤在第42行： ORA-06550：第42行，第1列： PLS-00306：錯號碼或類型的參數在調用 'PUT_LINE' ORA-06550：線42，第1列： PL/SQL：語句忽略} */

申報

v_CITY AIRPORT.CITY%TYPE; 
    v_ARRIVAL_TIME SCHEDULE.ARRIVAL_TIME%TYPE; 
    v_fnumber FLIGHT.FNUMBER%TYPE; 
    v_CITY1 AIRPORT.CITY%TYPE; 
    v_ARRIVAL_TIME1 SCHEDULE.ARRIVAL_TIME%TYPE; 
    v_fnumber1 FLIGHT.FNUMBER%TYPE; 


    /* First cursor */ 
    CURSOR get_tables IS 
select airp2.CITY , S. ARRIVAL_TIME,S.fnumber 
from schedule S, FLIGHT F, airport airp1, airport airp2 
where airp1.apcode = DEPARTURE_APCODE and airp2.apcode = ARRIVAL_APCODE AND ARRIVAL_APCODE ='BWI'and S.FNUMBER= F.FNUMBER AND 
TO_CHAR(TRUNC(S.DEPARTURE_TIME)) = date'2017-11-12' 
ORDER BY airp1.CITY, ARRIVAL_TIME ; 

    /* Second cursor */ 
    CURSOR get_columns IS 
    select DISTINCT airp2.CITY , S. DEPARTURE_TIME,S.fnumber 
from schedule S, FLIGHT F, airport airp1,FLIGHT_RESERVATION FL, airport airp2 
where airp1.apcode = ORIGIN_APCODE and airp2.apcode = DESTINATION_APCODE AND ORIGIN_APCODE ='BWI'and S.FNUMBER= F.FNUMBER AND 
TO_CHAR(TRUNC(S.DEPARTURE_TIME)) = date'2017-11-12' 
ORDER BY airp2.CITY, DEPARTURE_TIME ; 

    BEGIN 

    -- Open first cursor 
    OPEN get_tables; 
    LOOP 
     FETCH get_tables INTO v_CITY, v_ARRIVAL_TIME, v_fnumber; 



     -- Open second cursor 
     OPEN get_columns; 

     LOOP 
     FETCH get_columns INTO v_CITY1, v_ARRIVAL_TIME1, v_fnumber1; 

DBMS_output.put_line(v_CITY1, v_ARRIVAL_TIME1, v_fnumber1); 


CLOSE get_tables; 

     END LOOP; 

     CLOSE get_columns; 

    END LOOP; 
END; 

Answer 1

DBMS_OUTPUT.PUT_LINE只有一個參數，所以要輸出的多個值你必須轉換他們字符串並將它們連接在一起。將您的PUT_LINE電話改爲

DBMS_output.put_line('CITY1=' || TO_CHAR(v_CITY1) || 
        ' ARRIVAL_TIME=' || TO_CHAR(v_ARRIVAL_TIME1) || 
        ' FNUMBER=' || TO_CHAR(v_fnumber1)); 

祝您好運。