哪个高手把这个代码逻辑简化下 多谢

哪个高手把这个代码逻辑简化下 谢谢

Java code

 if(!beginTime.equals("")&&!endTime.equals("")) {                  hql="select sum(d.money)  from Income d where d.company.id="+companyId+" and d.incomeTime>='"+beginTime+"' and d.incomeTime<='"+endTime+"' and d.isDeleted=0";                  }                  else if(!beginTime.equals("")) {                      hql="select sum(d.money)  from Income d where d.company.id="+companyId+" and d.incomeTime>='"+beginTime+"' and d.isDeleted=0";                  }                   else if(!endTime.equals(""))  {                      hql="select sum(d.money)  from Income d where d.company.id="+companyId+" and d.incomeTime<='"+endTime+"' and d.isDeleted=0";                  }                  else {                      hql="select sum(d.money)  from Income d where d.company.id="+companyId+" and d.isDeleted=0";                  }

Java code

StringBuilder buff = new StringBuilder("select sum(d.money) from Income d where d.isDeleted=0 and d.company.id=");buff.append(companyId);if (beginTime != null && beginTime.length() != 0) {    buff.append(" and d.incomeTime >= '").append(beginTime).append("'");}if (endTime != null && endTime.length() != 0) {    buff.append(" and d.incomeTime <= '").append(endTime).append("'");}hql = buff.toString();