@Test public void testFindById() { OrderDO order = orderService.findById(1); System.out.println(order); }
public OrderDO findById(Integer id) { return orderMapper.selectById(id); }
OrderService { public OrderDO findById(Integer id) { return orderMapper.selectById(id); } }
OrderService { public OrderDO findById(Integer id) { return orderMapper.selectById(id); }  }
OrderService { public OrderDO findById(Integer id) { return orderMapper.selectById(id); }  @Transactional void add(OrderDO order); OrderDO findById(Integer id); }
OrderService { public OrderDO findById(Integer id) { return orderMapper.selectById(id); }  @Transactional void add(OrderDO order); OrderDO findById(Integer id);  }