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How to use PHP to do paging query

一个新手Original: 2017-10-09 09:30:381547browse

1. First display all the data in the database on the page in pages, and add a query form above the table displaying the data. (Add conditions to achieve the target results.)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<br />
<form action="fenyechaxun.php" method="get"><!--分页查询最好使用get，不要使用post，使用post会变得很复杂。-->
    <p>关键字：<input type="text" name="key" />
        <input type="submit" value="查询" />
    </p>
</form>
<br />
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
    <th>地区代号</th><!--坐标头-->
    <th>地区名称</th>
    <th>上级代号</th>
</tr>

<?phpinclude("DBDA.class.php");//引入封装类的页面$db = new DBDA();//造一个对象

//求数据的总条数$sall = "select count(*) from chinastates";$total = $db->StrQuery($sall);include("page.class.php");//引入分页类的页面$page = new Page($total,20);//造一个分页的对象.第一个参数是数据的总条数，第二个参数是每页显示多少条数据。$sql = "select * from chinastates ".$page->limit;//调用分页里面的limit方法。$attr = $db->Query($sql);foreach($attr as $v)
{    echo "<tr><td>{$v[0]}</td><td>{$v[1]}</td><td>{$v[2]}</td></tr>";
}?>

</table>

<?phpecho $page->fpage();//显示表格下方的数据和页面的信息。?>

</body>
</html>

2. Do the processing page of paging query

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

//查询条件
$tj1 = " 1=1 ";
if(!empty($_GET["key"]))//获取提交的关键字
{
    $tj1 = " areaname like &#39;%{$_GET[&#39;key&#39;]}%&#39;";
}

$sall = "select count(*) from chinastates where {$tj1}";//把条件拼接到语句中
$total = $db->StrQuery($sall);

include("page.class.php");
$page = new Page($total,20);

$sql = "select * from chinastates where {$tj1} ".$page->limit;//这里也要加上搜索条件
$attr = $db->Query($sql);

foreach($attr as $v)
{
    echo "<tr><td>{$v[0]}</td><td>{$v[1]}</td><td>{$v[2]}</td></tr>";
}

?>

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