@Test public void updateByExampleSelective() { Criteria example = new Criteria(); example.put("balance", 123); Trade trade = new Trade(); trade.setBalance(new BigDecimal(12)); trade.setMyaccount("110"); int result = tradeDao.updateByExampleSelective(trade, example); assertEquals(1, result); trade = tradeDao.selectByPrimaryKey("1"); assertEquals("110", trade.getMyaccount()); }