smt.execute(acc);//执行查询，并bind返回结果到account结构               
                while(smt.fetch()){
                printf("%s %d %d\n",acc.user,acc.status,acc.id);
                       
                };

                smt1.bind(acc);//bind查询参数
                smt1.execute();//执行
               
               
               
        }catch(const char* err){
                printf("error:%s\n",err);
        }

}