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");
 }StringBuffer sb=new StringBuffer();
 sb.append(