Wierd PL SQL無效光標

Question

當運行下面的代碼時，我得到一個ORA-01001：無效光標不知道發生了什麼，我將它轉換爲一個過程並開始發生;

CREATE OR REPLACE PROCEDURE p_student_from_class_list (p_stu_id IN NUMBER) 
IS 
--Declaring a variable -- 
    v_date date; 

    --Creating a Cursor to find data from using the p_stu_id paramenter-- 
    CURSOR enrollments_cursor IS 
     SELECT enrollment_date, stu_id, class_id, status 
     FROM enrollments 
     WHERE stu_id = p_stu_id; 


BEGIN 
    /*Changing the date so the code looks for the classes for the student 
    which was entered in the bind variable above for the last 10 years*/ 
    v_date := add_months(SYSDATE, -120); 
    FOR v_enrollment_record IN enrollments_cursor 
    LOOP 
--Displays the student's enrollment date, class ID and Current Status for each class >they taken in last 10 years,from the value which was entered in the bind variable-- 
     IF v_enrollment_record.enrollment_date 
     between v_date AND SYSDATE THEN 
      DBMS_OUTPUT.PUT_LINE('Enrollment Date: ' 
      ||v_enrollment_record.enrollment_date 
      ||' Class ID: '||v_enrollment_record.class_id 
      ||' Status: '||v_enrollment_record.status); 
     END IF; 
    END LOOP; 
    --Closing the cursor -- 
    CLOSE enrollments_cursor; 

    --Application Express processes the statement-- 
    COMMIT; 
    --Telling Application Express the procedure has finished-- 
END p_student_from_class_list; 

    --Anonymous Block to run the Procedure-- 

BEGIN 
    p_student_from_class_list(--Student ID--); 
END; 

正如我所說的代碼，當它在一個過程，但由於某種原因，創建它作爲一個過程，現在給出了這樣的錯誤是得到了工作。我一直在試圖解決這個問題。

Answer 1

對於您用作FOR <record> IN <cursor> LOOP的遊標，您不需要手冊CLOSE。你只需要CLOSE一個你手動的光標OPEN ed（然後FETCH ed）。

只是刪除行：

CLOSE enrollments_cursor; 

比較的文檔FOR LOOP和OPEN-FETCH-CLOSE pattern。