Question

我正在开发一个以列出的格式显示数据库产品的网站，到目前为止一直很好。但是，我想在上面添加一个简单的复选框，勾选后，按价格，最低到最高（以及从最高到最低的另一个）对列表进行排序。我试过这样做，但我遇到了问题。

首先，我添加了一个标有＆＃34的复选框（请参见下面的HTML）;按最低价格排序＆＃34;。然后我在主数据库查询下面的PHP代码中添加了一行（我的PHP代码大约10行），它试图在数据库查询的末尾附加一段查询语言，就在上面，但它没有＆似乎工作正常。

我只是想这样做，以便当用户选中复选框时，它按最便宜的价格排序。我做错了什么？

注意：＆＃39; buynow＆＃39;是每行存储价格数据的地方。

HTML

<form action="spain-holidays.php" method="post">
  <p>Order by lowest price:</p><input name="orderbyprice" type="checkbox" value="orderbyprice" />
</form>

PHP

<?php 

//connect
include ("db.connect.php");

//pagination
$per_page = 20;

$pages_query = mysql_query("SELECT COUNT('id') FROM `holidaytable` WHERE brandname = 'Spain'");
$count = mysql_result($pages_query, 0);
$pages = ceil(mysql_result($pages_query, 0) / $per_page);

$page = (isset($_GET['page'])) ? (int)$_GET['page'] : 1;
$start = ($page - 1) * $per_page;

echo '<p>There are '.$count.' holidays<hr></p><br /><br />';

//construct query and insert values

$query = mysql_query("SELECT * FROM holidaytable WHERE brandname = 'Spain' LIMIT $start, $per_page") or die(mysql_error());


//THIS IS THE LINE I ADDED HERE:

if (isset($_POST['orderbyprice'])) $query .= " ORDER BY buynow ASC";



while($rows = mysql_fetch_assoc($query)) {

    $name = $rows['name'];
    $id2 = $rows['id2'];
    $hotelname = $rows['hotelname'];
    $desc = $rows['desc'];
    $spec = $rows['spec'];
    $resort = $rows['resort'];
    $awtrack = $rows['awtrack'];
    $awthumb = $rows['awthumb'];
    $awimage = $rows['awimage'];
    $mthumb = $rows['mThumb'];
    $mlink = $rows['mlink'];
    $mimage = $rows['mimage'];
    $buynow = $rows['buynow'];
    $awcatid = $rows['awcatid'];
    $mcat = $rows['mcat'];
    $brandname = $rows['brandname'];


echo  "<div class='resultbox'>
<div class='resultboxtopbar'>
    <div class='hotelname'><h3>$hotelname</h3></div>
    <div class='price'><h3>From <strong>£$buynow</strong> $spec</h3></div>
</div>
<div class='resultboxmain'>
    <div class='resultboximage'><a href='$awtrack' target='_blank'><img src='$mimage' /></a></div>

        <h4>$resort, $brandname</h4>
        <p>$name</p>
        <p>$desc...</p>
        <div class='moreinfobutton'><input name='moreinfo' type='button' value='moreinfo' /></div>
</div>";

//more pagination, etc

Answer 1

mysql_query()不返回字符串，因此无法追加。你应该做这样的事情：

$sql = "SELECT * FROM holidaytable WHERE brandname = 'Spain' LIMIT $start, $per_page";

if (isset($_POST['orderbyprice'])) $sql .= " ORDER BY buynow ASC";

$query = mysql_query($sql) or die(mysql_error());

如何根据正在设置的复选框附加到搜索查询？

1 个答案: