php+mysql结果集的分页显示

<?php

//数据库:test

//表名:users(userID,useName,uerPwd);

$connect=mysql_connect("localhost","root","123456") or die("连接数据库失败");

mysql_select_db("test") or die("数据库无法使用");

$sql="select * from users";

$query=mysql_query("select * from users");

echo "数据库连接成功";

//设计每个页要显示的记录数

$pagesize=4;

//表中总的记录数

$records=mysql_num_rows($query);

//总共要用多少页

if($records%$pagesize==0)

{

$totalpages=(int)($records/$pagesize);

}

else

{

$totalpages=(int)($records/$pagesize)+1;

}

//看用户是选择了哪个页

if(isset($_GET['page']))

{

$p=(int)$_GET['page'];

}

else

{

$p=1;

}

//计算出起始记录

$start=$pagesize*($p-1);

$query2=mysql_query("select * from  users limit $start,$pagesize");

echo "<table boeder=6>";

echo "<tr><td>用户ID</td><td>用户名</td><td>密码</td></tr>";

while($row=mysql_fetch_array($query2))

{

$userid=$row['userID'];

$username=$row['userName'];

$userpwd=$row['uerPWD'];

echo "<tr>";

echo "<td>$userid</td>";

echo "<td>$username</td>";

echo "<td>$userpwd</td>";

}

echo "</table>";

if($p>1)

{

$pre_page=$p-1;

echo "<a href='?page=$pre_page'>上一页</a>";

}

if($p<$totalpages)

{

$next_page=$p+1;

echo "<a href='?page=$next_page'>下一页</a>";

}

?>