@Test
  public void updateByPrimaryKeySelective() {
    Trade trade = new Trade();
    trade.setId("1");
    trade.setBalance(new BigDecimal(123));
    trade.setMyaccount("110");
    int result = tradeDao.updateByPrimaryKeySelective(trade);
    assertEquals(1, result);

    trade = tradeDao.selectByPrimaryKey("1");
    assertEquals("110", trade.getMyaccount());
  }