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
原文：http://www.cnblogs.com/21heshang/p/7363116.html