需要名称为book的mysql数据库表 表中含有下列字段： id   下载的文件的唯一标识 downnum  点击数 first.php <?while($myrow = @mysql_fetch_array($result)) { ?> <TR> <TD> <?if(empty($myrow["downnum"])) echo "0"; else echo $myrow["downnum"]; ?>   </TD> <TD> <a  href="ddload.php?purl=downfileurl&dnnum=<?echo $myrow['downnum'] ?>&id=<?echo $myrow['id']?>">click here download </a> </TD> </TR> <?};?> ddload.php <?      include("data.inc.php");      if($incerror)      {            echo $incerror;            exit;      }      if(empty($dnnum)) $dnnum = 1;      else $dnnum ++;      $sql = "update book set downnum ='$dnnum' where id =$id";      mysql_query($sql);      mysql_close($connect);      header("location:$purl"); ?>