Declare
vStudent_id grade.student_id%TYPE;
vSection_id grade.section_id%TYPE;
vNumeric_grade grade.numeric_grade%TYPE;
CURSOR gradeCursor IS
SELECT student_id,section_id,numeric_grade
FROM grade
WHERE student_id = 102
ORDER by numeric_grade;
Begin
Open gradeCursor;
LOOP
FETCH gradeCursor
INTO vStudent_id,vSection_id,vNumeric_grade;
EXIT WHEN gradeCursor%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('Student number: ' || vStudent_id );
DBMS_OUTPUT.PUT_LINE('Section_id: ' || vSection_id );
IF numeric_grade IS NOT NULL THEN
DBMS_OUTPUT.PUT_LINE('Numeric Grade: ' || vNumeric_grade );
ELSE
DBMS_OUTPUT.PUT_LINE('Numeric Grade: NULL' );
END IF;
END LOOP;
IF gradeCursor%ISOPEN THEN CLOSE gradeCursor; END IF;
EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE('Error dected' );
IF gradeCursor%ISOPEN THEN CLOSE gradeCursor; END IF;
END;
答案 0 :(得分:0)
通过排除隐式游标和所有内容,可以轻松简化您的代码。您可以轻松使用FOR循环来满足您的要求。希望下面的代码有帮助。
DECLARE
vStudent_id grade.student_id%TYPE;
vSection_id grade.section_id%TYPE;
vNumeric_grade grade.numeric_grade%TYPE;
BEGIN
FOR I IN
(SELECT student_id,
section_id,
numeric_grade
FROM grade
WHERE student_id = 102
ORDER BY numeric_grade
)
LOOP
DBMS_OUTPUT.PUT_LINE('Student number: ' || i.student_id);
DBMS_OUTPUT.PUT_LINE('Section_id: ' || i.section_id);
IF i.numeric_grade IS NOT NULL THEN
DBMS_OUTPUT.PUT_LINE('Numeric Grade: ' || i.numeric_grade );
ELSE
DBMS_OUTPUT.PUT_LINE('Numeric Grade: NULL' );
END IF;
END LOOP;
EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE('Error dected' );
END;