@Test
  public void insertSelective() {
    Trade trade1 = getTrade().get(0);
    Trade trade2 = getTrade().get(1);
    trade1.setId(null);
    trade2.setId(null);
    tradeDao.insertSelective(trade1);

    logger.info(trade1.getId());
    tradeDao.insertSelective(trade2);
    logger.info(trade2.getId());

    int a = tradeDao.countByExample(new Criteria());
    assertEquals(4, a);
  }