BigDecimalf大小的比较

Record queryCash = dao.queryCash(accountCash);
BigDecimal dbMoney = queryCash.getBigDecimal("freeMoney");
BigDecimal requestMoney = new BigDecimal(accountCash.getCashMoney());

requestMoney.compareTo(dbMoney)>0

-1 小于  
0 等于
1 大于