CREATE TABLE ORDERS ( ORDERSID NUMBER(10) PRIMARY KEY, ORDERSDate DATE, ORDERStatus VARCHAR2(20), TotalCost NUMBER(10,2), CustomerID NUMBER(10), FOREIGN KEY (CustomerID) REFERENCES CUSTOMER(CustomerID) ); 以group25作为密钥加密TotalCost
时间: 2023-12-03 19:46:24 浏览: 35
以下是使用Oracle数据库中的DBMS_CRYPTO包来进行加密的示例代码:
```
-- 创建加密密钥
DECLARE
v_key RAW(256) := UTL_RAW.cast_to_raw('group25');
v_encrypted_key RAW(2048);
BEGIN
v_encrypted_key := DBMS_CRYPTO.ENCRYPT(
src => v_key,
typ => DBMS_CRYPTO.DES3_CBC_PKCS5,
key => v_key
);
DBMS_OUTPUT.PUT_LINE('Encrypted key: ' || UTL_RAW.cast_to_varchar2(v_encrypted_key));
END;
/
-- 加密TotalCost字段
UPDATE ORDERS SET TotalCost = DBMS_CRYPTO.ENCRYPT(
src => TO_CHAR(TotalCost),
typ => DBMS_CRYPTO.DES3_CBC_PKCS5,
key => UTL_RAW.cast_to_raw('group25')
)
WHERE TotalCost IS NOT NULL;
```
需要注意的是,加密后的TotalCost字段将变为二进制数据类型,无法直接进行查看和比较。因此,在查询TotalCost字段时,需要先将其解密并转换为相应的数据类型。以下是解密和转换的示例代码:
```
-- 解密TotalCost字段
SELECT ORDERSID, ORDERSDate, ORDERStatus,
TO_NUMBER(DBMS_CRYPTO.DECRYPT(
src => TotalCost,
typ => DBMS_CRYPTO.DES3_CBC_PKCS5,
key => UTL_RAW.cast_to_raw('group25')
)) AS TotalCost,
CustomerID
FROM ORDERS;
-- 注意:此处的TO_NUMBER函数需要根据实际情况进行调整,确保解密和转换的结果是正确的。
```