// 根据id删除
	@Test
	public void testDeletedId() {
		int rows = userMapper.deleteById(1L);
		System.out.println(rows);
	}

	// 批量删除
	@Test
	public void testDeletedBatchIds() {
		int result = userMapper.deleteBatchIds(Arrays.asList(2, 3));
		System.out.println(result);
	}

	// 简单条件删除
	@Test
	public void testDeleteByMap() {
		HashMap<String, Object> map = new HashMap<>();
		map.put("name", "Helen");
		map.put("age", 18);
		int result = userMapper.deleteByMap(map);
		System.out.println(result);
	}