关于MySQL加密详解

MySQL字段加密和解密

1.   加密：

    aes_encrypt('admin','key')

    2.  解密：

  aes_decrypt(password,'key')

2.双向加密      通过密钥去加密，解密的时候的只有知道这个密钥的人来解密

      加密：encode()

      解密：decode()

           encode('123456' 'adfdgfdhggfh');

           decode(password,'adfdgfdhggfh');

3.PASSWORD('123456')

    password加密是不可逆转的

4.MD5('123456')

//UserDao 
public User login(Connection con,User user) throws Exception{
        User resultUser=null;
        String sql="select userName,AES_DECRYPT(password,'key') password from t_user where userName=? and AES_DECRYPT(PASSWORD,'key')=?";
        PreparedStatement pstmt=con.prepareStatement(sql);
        pstmt.setString(1, user.getUserName());
        pstmt.setString(2, user.getPassword());
        ResultSet rs=pstmt.executeQuery();
        if(rs.next()){
            resultUser=new User();
            resultUser.setUserName(rs.getString(1));
            resultUser.setPassword(rs.getString(2));
            System.out.println(resultUser.getPassword()+"^^^^^");
        }
        return resultUser;
    }
}
   
 //sql语句 
 insert into t_user (userName,password) values('admin',AES_ENCRYPT('123456','key'));  
 select userName,AES_DECRYPT(password,'key')password from t_user;

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