用户服务

QueryWrapper<User> queryWrapper = new QueryWrapper<>();
// 查询user_name列与getUsername相匹配的数据
queryWrapper.eq("user_name", request.getUsername()); 
User user = userMapper.selectOne(queryWrapper);

// 密码采用了md5加密
String md5Password = MD5Util.encrypt(user.getUserPwd());
user.setUserPwd(md5Password);

QueryWrapper<User> queryWrapper = new QueryWrapper<>();
// 根据user_name查询用户是否存在
queryWrapper.eq("user_name", request.getUsername());
User user = userMapper.selectOne(queryWrapper);
if (user != null && user.getUuid() > 0) {
    // 用户不为空，用户id > 0
    String md5Password = MD5Util.encrypt(request.getPassword());
    if (user.getUserPwd().equals(md5Password)) {
        // 数据库密码和所加密的md5密码一致
        res.setUserId(user.getUuid());
        res.setCode(SbCode.SUCCESS.getCode());
        res.setMsg(SbCode.SUCCESS.getMessage());
    }
}

//根据id查询用户
User user = userMapper.selectById(request.getId());
UserDto userDto = userConverter.User2Res(user);

// 这里一采用了mapstruct映射，有兴趣的可以去网上找资料学习学习
User user = userConverter.res2User(request);