＆＃39; HELP＆＃39;使用MySQL结果和PHP编码

Question

我是MySQL和PHP的新手。我正在建立一个显示MySQL结果的网站，然后有一个选择选项，允许观众选择他希望如何排序结果，然后他被带到另一个页面并排序结果。

这是我的select函数代码：

<div id="query">
        <label style="font-weight:bold;display:inline;">Sort By:</label>
                <select id="selection">
                            <option value="">Choose to sort...</option>
                            <option value="?sort=ranking">Ranking</option>
                            <option value="?sort=price_asc">Price: Low to high</option>
                            <option value="?sort=price_desc">Price: High to low</option>
                            <option value="?sort=title_asc">Title: A to Z</option>
                            <option value="?sort=title_desc">Title: Z to A</option>
                </select>
        <script>
            document.getElementById("selection").onchange = function() {
                if (this.selectedIndex!==0) {
                    window.location.href = this.value;
                }        
            };
        </script>
        </div>

以下是更改查询的代码：

$Query = "SELECT * FROM `AhopData` WHERE `Item` = 999";

“出于某种原因，这是行不通的。任何帮助都会非常感激。谢谢”

Answer 1

在ORDER BY子句

之后尝试使用LIMIT

$Query = "SELECT * FROM `GamesData` WHERE `Ranking` <=20";

if ($_GET['sort'] == 'ranking')
{
    $Query .= " ORDER BY Ranking ASC";
}
elseif ($_GET['sort'] == 'price_asc')
{
    $Query .= " ORDER BY Price ASC";
}
elseif ($_GET['sort'] == 'price_desc')
{
    $Query .= " ORDER BY Price DESC";
}
elseif($_GET['sort'] == 'title_asc')
{
    $Query .= " ORDER BY Title ASC";
}
elseif($_GET['sort'] == 'title_desc')
{
    $Query .= " ORDER BY Title DESC";
}
$Query .= " LIMIT $limit";