Question

我正在为具有2个参数的mysql数据库编写查询。

它是一个基本的搜索，但问题是我想根据选择对结果的顺序进行排序。所以在我点击了搜索按钮并且浏览器显示了结果集后，我想按 expiration-date 或 price 依赖于我点击的按钮。

//SELECTION DATA FORM <form action="EVENTS_SELECTION.PHP"> <select name="Type"> <option value="">SPORT <option value="">CULTURE <option value="">LEISURE <option value="">GASTRONOMY </select> <select name="WHERE"> <option>ROME ALL <option>ROME SOUTH <option>ROME WEST <option>ROME EAST <option>ROME NORTH </select> <input type="submit" value="search"> </form>

我怎样才能实现？谢谢卢卡

Answer 1

如果您想在搜索后排序，可以使用usort()功能：

function myComparer($a, $b)
{
    if ($GLOBALS['SEARCH_TYPE'] == 'PRICE')
    {
        $valueA = floatval($a['price']);
        $valueB = floatval($b['price']);
    }
    else ($GLOBALS['SEARCH_TYPE'] == 'EXPIRATION-DATE')
    {
        // time string to UNIX timestamp integer value
        $valueA = strtotime($a['expiration_date']);
        $valueB = strtotime($b['expiration_date']);
    }

    if ($valueA == $valueB) {
        return 0;
    }

    return ($valueA < $valueB) ? -1 : 1;
}

include './get_search_type.php';
// is stored in array $GLOBALS['SEARCH_TYPE']

include './get_search_result.php'; xyz is the field name
// is stored in array $GLOBALS['SEARCH_RESULT'][xyz]

usort($GLOBALS['SEARCH_RESULT'], myComparer);

btw：在我看来，最好生成一个动态查询来按DBMS排序（这更容易）：

if ($GLOBALS['SEARCH_TYPE'] == 'PRICE')
{
    $query = "SELECT * FROM Products ORDER BY price;";
}
else ($GLOBALS['SEARCH_TYPE'] == 'EXPIRATION-DATE')
{
    $query = "SELECT * FROM Products ORDER BY expiration_date;";
}

Answer 2

[服务器端] 将php查询结果存储到如下数组中：

// if you want to sort by column 'name', store them by format: $dataset[{pid}] = {name};
// pid  name
//  1   test1
//  2   alpha1
//  5   candy1
while (...) // read query result
{
    $dataset[$row['pid']] = new array($row['name'] => $row);
}    
// now, use sort()
sort($dataset);

// then foreach array to get sorted data;
foreach ($datasetas $key => $val) {
    echo $val."\n";
}

[客户端] 读取数据并按JSON格式和响应存储它们。然后，在您的页面中，使用javascript json库对它们进行排序。

如何在查询完成后对mysql结果集进行排序

2 个答案: