MyBatisPlus基础查询使用：

• 1:多条件查询&排序:

  QueryWrapper<User> queryWrapper = new QueryWrapper<>();
  queryWrapper.lambda().ge(User::getId, 100).orderByDesc(User::getId);
  list = userService.list(queryWrapper);
  

• 2：模糊查询:

  QueryWrapper<User> queryWrapper=new QueryWrapper<>();
  queryWrapper.lambda().like(User::getId,12);
  List<User> list = userService.list(queryWrapper);
  for (User user : list) {
          System.out.println(user.toString());
   }
  

• 3:根据Wrapper更新：

//根据wrapper 更新
  LambdaQueryWrapper<User> updateWrapper = new QueryWrapper<User>().lambda().eq(User::getId, 101);
  User user = new User();
  user.setUsername("东方不败");
  user.setCreateDate(new Date());
  boolean update_flag = userService.update(user, updateWrapper);

• 4:只查询一行&#