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<?php
$str1="select class_id from class";
$result=mysql_query($str1,$link_id);
$idd='$class_id';
if(!empty($_GET['page'])) $page = $_GET['page'];
else $page = 1;
$pagesize = 30;
if ($xlb =="" and $username=="") {
$str="select count(*) as amount from base";}
elseif ($xlb!="" and $username=="") {
$str="select count(*) as amount from base where xlb='$xlb'";}
elseif($xlb=="" and $username!="") {
$str="select count(*) as amount from base where username='$username' and id='$idd'";}
$rs=mysql_fetch_array(mysql_query($str,$link_id));
$amount=$rs['amount'];
$totlepage=ceil($amount/$pagesize);
if ($xlb =="" and $username=="") {
$str="select * from base order by id DESC limit ".($page-1)*$pagesize.",$pagesize";}
elseif ($xlb!="" and $username=="") {
$str="select * from base where xlb='$xlb' order by record_time DESC limit ".($page-1)*$pagesize.",$pagesize";}
elseif($xlb=="" and $username!=""){
$str="select * from base where username='$username' and id='$idd' order by id DESC limit ".($page-1)*
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