Question

* /我正在尝试使用2个显式游标，它会显示这些错误

{：第42行的错误： ORA-06550：第42行第1栏： PLS-00306：调用＆＃39; PUT_LINE＆＃39;中的参数数量或类型错误 ORA-06550：第42行第1栏： PL / SQL：忽略语句} * /

声明

   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只接受一个参数，因此要输出多个值，您必须将它们转换为字符串并将它们连接在一起。将您的PUT_LINE调用更改为

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

祝你好运。

使用2个显式游标。

1 个答案: