更新一个表，字段名不确定 java如何实现

StringBuffer sb=new StringBuffer(); sb.append(" update quick_order "); sb.append(" set  id=id "); if(StringUtils.isNotBlank(address)) {     sb.append(" , address='"+address+"'"); } if(StringUtils.isNotBlank(buyerName)){     sb.append(" ,buyer_name='"+buyerName+"'"); } if(StringUtils.isNotBlank(buyerName)){     sb.append(" ,buyer_mobile='"+buyerMobile+"'"); } sb.append(" where code='"+code+"'"); int count=DbTools.executeUpdate(sb.toString(),conn); if(count>0){     map.put("info", "修改成功");     map.put("code", "0");     map.put("desc", "success"); }