ajax实现数据分页查询

<?php
include("DBDA.class.php");
$db = new DBDA();

$key = $_POST["key"];
$num = 20;

$sql = "select count(*) from chinastates where areaname like '%{$key}%'";

$zts = $db->StrQuery($sql);

echo ceil($zts/$num);

处理页面2

<?php
include("DBDA.class.php");
$db = new DBDA();

$page = $_POST["page"];
$key = $_POST["key"];
$num = 20;
$tiao = ($page-1)*$num;

$sql = "select * from chinastates where areaname like '%{$key}%' limit {$tiao},{$num}";

echo $db->JSONQuery($sql);

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