数据库级别的加密--MD5加密

/*
 Navicat Premium Data Transfer

 Source Server         : TW
 Source Server Type    : MySQL
 Source Server Version : 50739
 Source Host           : localhost:3306
 Source Schema         : mybatis_plus

 Target Server Type    : MySQL
 Target Server Version : 50739
 File Encoding         : 65001

 Date: 21/10/2022 17:11:07
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for testmd5
-- ----------------------------
DROP TABLE IF EXISTS `testmd5`;
CREATE TABLE `testmd5`  (
  `id` int(4) UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `pwd` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of testmd5
-- ----------------------------
INSERT INTO `testmd5` VALUES (1, 'zhansan', 'e10adc3949ba59abbe56e057f20f883e');
INSERT INTO `testmd5` VALUES (2, 'lisi', '123457');
INSERT INTO `testmd5` VALUES (3, 'wangwu ', '123458');
INSERT INTO `testmd5` VALUES (4, 'xiaoming', '51f6f8fe03a390d3de50ad49913d4b66');

SET FOREIGN_KEY_CHECKS = 1;




-- MD5加密
USE testmd5;

-- 加密
UPDATE testmd5 set pwd=MD5(pwd) WHERE id=1;
UPDATE testmd5 set pwd=MD5(pwd);

-- 插入时加密：重要！
INSERT INTO testmd5 VALUES(4,'xiaoming',MD5('123459'));

-- 如何校验：将用户传递过来的密码，进行MD5加密，然后比对加密后的值
SELECT * FROM testmd5 WHERE `name`='zhansan' AND pwd=MD5(123457);
           

MD5 信息摘要演算法（Message-Digest Algorithm），一种被广泛使用的密码杂凑函数，可以产生出一个128位元（16位元组）的散列值（hash value），用于确保信息传输完整一致。