Question

嗨，这是我的第一篇文章，很抱歉，如果之前有人询问的话。我正在尝试创建一个程序，它将增加存款账户（对于特定银行）的兴趣，并在屏幕上输出客户名称和存款账户的新余额。但是，我似乎无法让它工作。

CREATE OR REPLACE PROCEDURE addInterestNew(bank VARCHAR, interestRate INT out) AS
CURSOR CustomerBalance IS
SELECT customerName, balance
FROM Deposit
WHERE branchName = bank;


aCustomerName Deposit.customerName%TYPE;
newBalance  Deposit.balance%TYPE

BEGIN 
UPDATE DEPOSIT
SET balance = balance * (1 + (interestRate/100))
WHERE branchName = bank;

FETCH
OPEN CustomerBalance;
LOOP
FETCH CustomerBalance into aCustomerName,newbalance;
EXIT WHEN CustomerBalance%notfound;
dbms_output.put_line('CustomerName='||aCustomerName ||'balance='||newBalance);
END LOOP;
CLOSE CustomerBalance;

END;
/

任何帮助都是值得赞赏的

感谢

Answer 1

似乎大多数代码都没问题，你只需要在光标打开之前有一个额外的FETCH，应删除它。此外，在newBalance变量声明后，您缺少分号。除此之外，您将interestRate参数声明为IN OUT，但您似乎无法在任何地方对其进行修改。不过，这应该有效：

CREATE OR REPLACE PROCEDURE addInterestNew(bank VARCHAR, interestRate INT out) AS

  CURSOR CustomerBalance IS
    SELECT customerName, balance
      FROM Deposit
    WHERE branchName = bank;

  aCustomerName Deposit.customerName%TYPE;
  newBalance  Deposit.balance%TYPE;
BEGIN 
  UPDATE DEPOSIT
    SET balance = balance * (1 + (interestRate/100))
  WHERE branchName = bank;

  OPEN CustomerBalance;

  LOOP
    FETCH CustomerBalance into aCustomerName,newbalance;
    EXIT WHEN CustomerBalance%notfound;
    dbms_output.put_line('CustomerName='||aCustomerName ||'balance='||newBalance);
  END LOOP;

  CLOSE CustomerBalance;
END;
/

带有显式游标的SQL过程

1 个答案: