怎么使用DBMS_CRYPTO以618272为密钥加密ORDERS表中TotalCost NUMBER(35,2)列的数据

您可以使用以下步骤使用DBMS_CRYPTO以618272为密钥加密ORDERS表中TotalCost NUMBER(35,2)列的数据：

1. 在Oracle数据库中创建一个包来封装加密和解密函数：

CREATE OR REPLACE PACKAGE my_crypto_pkg AS
  FUNCTION encrypt(p_plain_text VARCHAR2, p_key VARCHAR2) RETURN RAW;
  FUNCTION decrypt(p_cipher_text RAW, p_key VARCHAR2) RETURN VARCHAR2;
END my_crypto_pkg;
/

CREATE OR REPLACE PACKAGE BODY my_crypto_pkg AS
  FUNCTION encrypt(p_plain_text VARCHAR2, p_key VARCHAR2) RETURN RAW IS
    l_encrypted_raw RAW(2000);
  BEGIN
    l_encrypted_raw := DBMS_CRYPTO.ENCRYPT(
        UTL_I18N.STRING_TO_RAW(p_plain_text, 'AL32UTF8'),
        DBMS_CRYPTO.TYPE_AES128,
        UTL_I18N.STRING_TO_RAW(p_key, 'AL32UTF8'),
        DBMS_CRYPTO.ENCRYPT_CBC
    );
    RETURN l_encrypted_raw;
  END encrypt;

  FUNCTION decrypt(p_cipher_text RAW, p_key VARCHAR2) RETURN VARCHAR2 IS
    l_decrypted_raw RAW(2000);
  BEGIN
    l_decrypted_raw := DBMS_CRYPTO.DECRYPT(
        p_cipher_text,
        DBMS_CRYPTO.TYPE_AES128,
        UTL_I18N.STRING_TO_RAW(p_key, 'AL32UTF8'),
        DBMS_CRYPTO.ENCRYPT_CBC
    );
    RETURN UTL_I18N.RAW_TO_CHAR(l_decrypted_raw, 'AL32UTF8');
  END decrypt;
END my_crypto_pkg;
/

2. 使用包中的encrypt函数加密TotalCost列的数据：

UPDATE ORDERS
SET TotalCost = RAWTOHEX(my_crypto_pkg.encrypt(TO_CHAR(TotalCost), '618272'));

3. 使用包中的decrypt函数解密TotalCost列的数据：

SELECT TO_NUMBER(my_crypto_pkg.decrypt(HEXTORAW(TotalCost), '618272')) AS TotalCost
FROM ORDERS;