我试图将每位顾客的年龄提高1并展示出来;使用游标。
这是表结构。
Select * from customers;
+----+----------+-----+-----------+----------+
| ID | NAME | AGE | ADDRESS | SALARY |
+----+----------+-----+-----------+----------+
| 1 | Ramesh | 32 | Ahmedabad | 2000.00 |
| 2 | Khilan | 25 | Delhi | 1500.00 |
| 3 | kaushik | 23 | Kota | 2000.00 |
| 4 | Chaitali | 25 | Mumbai | 6500.00 |
| 5 | Hardik | 27 | Bhopal | 8500.00 |
| 6 | Komal | 22 | MP | 4500.00 |
这是我的代码:
DECLARE
c_id customers.id%TYPE;
c_name customers.name%TYPE;
c_age customers.age%TYPE;
CURSOR c1 IS
SELECT id, name, age
FROM customers
FOR UPDATE OF salary;
BEGIN
OPEN c1;
LOOP
FETCH c1 INTO c_id, c_name, c_age;
UPDATE customers
SET age = age + 1
WHERE CURRENT OF c1;
EXIT WHEN c1%NOTFOUND;
dbms_output.put_line( c_id || ' ' || c_name || ' ' || c_age );
END LOOP;
CLOSE c1;
END;
/
但是,我收到以下错误:
Error report:
ORA-01410: invalid ROWID
ORA-06512: at line 13
01410. 00000 - "invalid ROWID"
*Cause:
*Action:
1 Ramesh 32
2 Khilan 25
3 kaushik 23
4 Chaitali 25
5 Hardik 27
6 Komal 22
为什么会发生这种情况?如何阻止它?
答案 0 :(得分:4)
你的exit
在错误的地方;它应该在fetch
之后直接。您正在正确处理六个实际行,但之后您将进行第七次获取 - 之后%notfound
将为true
- 因此没有“当前”行要更新。在尝试对该无效行执行任何操作之前,您需要退出。
BEGIN
OPEN c1;
LOOP
FETCH c1 INTO c_id, c_name, c_age;
EXIT WHEN c1%NOTFOUND;
UPDATE customers
SET age = age + 1
WHERE CURRENT OF c1;
dbms_output.put_line( c_id || ' ' || c_name || ' ' || c_age );
END LOOP;
CLOSE c1;
END;
希望这只是一个练习,因为它不是一种非常有效的更新方式。