@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());
  }