@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); }