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 18:46:12 浏览: 21
你可以使用Oracle数据库中提供的DBMS_CRYPTO包来加密TotalCost。以下是使用AES256加密算法和group25作为密钥进行加密的示例SQL语句:
```
-- 创建加密函数
CREATE OR REPLACE FUNCTION encrypt_totalcost(p_totalcost NUMBER)
RETURN RAW
IS
l_key RAW(32) := UTL_RAW.CAST_TO_RAW('group25'); -- 密钥
l_iv RAW(16) := UTL_RAW.CAST_TO_RAW('1234567890123456'); -- 初始化向量
l_encrypted RAW(2000);
BEGIN
l_encrypted := DBMS_CRYPTO.ENCRYPT(UTL_RAW.CAST_TO_RAW(p_totalcost), DBMS_CRYPTO.AES256_CBC, l_key, l_iv);
RETURN l_encrypted;
END;
/
-- 创建触发器,在插入或更新订单时自动加密TotalCost
CREATE OR REPLACE TRIGGER orders_encrypt_trigger
BEFORE INSERT OR UPDATE ON orders
FOR EACH ROW
BEGIN
:new.totalcost := encrypt_totalcost(:new.totalcost);
END;
/
```
这将在每次插入或更新订单时自动调用encrypt_totalcost函数,并将加密后的结果存储在TotalCost列中。要解密TotalCost,可以使用以下SQL语句:
```
-- 创建解密函数
CREATE OR REPLACE FUNCTION decrypt_totalcost(p_encrypted RAW)
RETURN NUMBER
IS
l_key RAW(32) := UTL_RAW.CAST_TO_RAW('group25'); -- 密钥
l_iv RAW(16) := UTL_RAW.CAST_TO_RAW('1234567890123456'); -- 初始化向量
l_decrypted RAW(2000);
BEGIN
l_decrypted := DBMS_CRYPTO.DECRYPT(p_encrypted, DBMS_CRYPTO.AES256_CBC, l_key, l_iv);
RETURN TO_NUMBER(UTL_RAW.CAST_TO_VARCHAR2(l_decrypted));
END;
/
-- 查询加密后的TotalCost
SELECT ordersid, ordersdate, orderstatus, decrypt_totalcost(totalcost), customerid FROM orders;
```
这将返回一个包含解密后的TotalCost的查询结果集。
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