HTML表的MySQL PHP MySQL的切換上排序的列標題順序ASC DESC點擊

Question

編輯：從接受的答案

我問這裏的暗示是最聰明的方法添加的解決方案。

需要先說：我懇請您避免暗示databales和類似。

我在HTML表格中顯示MySQL表格內容。

我認爲是showdbtable.php它使用包括echohtmltable.php查詢數據庫和回顯錶行。

所以在echohtmltable.php目前有涉及這個問題

GET變量檢查

if(isset($_GET['sortby'])){ 
    $sortby=$_GET['sortby']; 
    $_GET['sortby']=''; } 
else { 
    $sortby="id_ord"; } 

和旁邊用來呼應錶行隨之而來的查詢

$query = " 
     SELECT id_ord, fornitore, negozio, data_insord, data_prevcons 
     FROM tesord 
     ORDER BY ".$sortby." DESC 
     LIMIT :from_record_num, :records_per_page"; 

的所有內容在列標題中創建分類機制

echo "<th>".'<a href="showdbtable.php?sortby=fornitore">' . "Fornitore</th>"; 
echo "<th>".'<a href="showdbtable.php?sortby=negozio">' . "Negozio</th>"; 
echo "<th>".'<a href="showdbtable.php?sortby=data_insord">' . "Data_insord</th>"; 
echo "<th>".'<a href="showdbtable.php?sortby=data_prevcons">' . "Data_prevcons</th>"; 

你知道這第一部分的作品。

當我只有點擊上述鏈接之一，查詢工作，但目前由於顯而易見的代碼，在DESC。

這種請求完全是一個建議。但請注意，我有分頁，你看，LIMIT :from_record_num, :records_per_page，這應該考慮。

其以這樣一種方式ASC和DESC之間切換聰明和有效的方式使得具有點擊一個鏈接後，例如「Negozio」，再次點擊「Negozio」它會在ASC中排序，然後點擊它將切換DESC，然後點擊ASC等。

我敢肯定，查詢將在具有可變變異我可以調用$ ascdesc

$query = " 
     SELECT id_ord, fornitore, negozio, data_insord, data_prevcons 
     FROM tesord 
     ORDER BY " . $sortby . " " . $ascdesc . " 
     LIMIT :from_record_num, :records_per_page"; 

需要管理，如果目前ASC或DESC和切換。

謝謝你暗示一些有效和智能的方法來實現目標。

---

解決方案：謝謝你在Rudy

爲了幫助別人新手像我這樣的緣故，這裏是我是如何應用的解決方案

// function used in the links 
function invdir($dir){ return ($dir == "DESC")? "ASC" : "DESC"; } 
// self explaining, it does invert the sort string in the link 

// collect, sanitize and default $_GET variables. 
// $ordinaper is the Italian of $sortby 
$ordinaper = (isset($_GET['ordinaper']))? (filter_var($_GET["ordinaper"], FILTER_SANITIZE_STRING)) : "id_ord"; 
$ascdesc = (isset($_GET['ascdesc']))? (filter_var($_GET["ascdesc"], FILTER_SANITIZE_STRING)) : "DESC"; 
// $filtraforn is a filter/search to show only one provider, see the query, it is assigned with a ìn AJAX live search 
$filtraforn = (isset($_GET['filtraforn']))? (filter_var($_GET["filtraforn"], FILTER_SANITIZE_STRING)) : ""; 

// build the common URL GET part 
$getlinks = "&filtraforn=".$filtraforn."&page=".$page."&ascdesc="; 
// the variable $page comes from the pagination which is out of the scope. Here I was dealing with the correct management of sorting the HTML table columns 

// the query is built accordingly, later is used in a PDO statement 
$query = "SELECT id_ord, fornitore, negozio, data_insord, data_prevcons FROM tesord "; 
$filtro = (strlen($filtraforn))? "WHERE fornitore = '" . $filtraforn . "' " : ""; 
$query = $query . $filtro . "ORDER BY ". $ordinaper ." ". $ascdesc ." LIMIT :from_record_num, :records_per_page"; 
// LIMIT :from_record_num, :records_per_page are bound later with variables coming from the pagination which is out of the scope. Here I was dealing with the correct management of sorting the HTML table columns 

// and here it is the final table heading 
// the ternary operator (($ordinaper!=="id_ord")? "DESC" : invdir($ascdesc)) is used because when clicking a different column, I want to default the sorting in DESC 
echo "<tr>"; 
    echo "<th></th>"; 
    echo "<th>". '<a href="read.php?ordinaper=id_ord' .$getlinks. (($ordinaper!=="id_ord")? "DESC" : invdir($ascdesc)) .'">' . "id_ord</th>"; 
    echo "<th>". '<a href="read.php?ordinaper=ord_evaso' .$getlinks. (($ordinaper!=="ord_evaso")? "DESC" : invdir($ascdesc)) .'">' . "Stato</th>"; 
    echo "<th>". '<a href="read.php?ordinaper=fornitore' .$getlinks. (($ordinaper!=="fornitore")? "DESC" : invdir($ascdesc)) .'">' . "Fornitore</th>"; 
    echo "<th>". '<a href="read.php?ordinaper=negozio' .$getlinks. (($ordinaper!=="negozio")? "DESC" : invdir($ascdesc)) .'">' . "Negozio</th>"; 
    echo "<th>". '<a href="read.php?ordinaper=data_insord' .$getlinks. (($ordinaper!=="data_insord")? "DESC" : invdir($ascdesc)) .'">' . "Data_insord</th>"; 
    echo "<th>". '<a href="read.php?ordinaper=data_prevcons' .$getlinks. (($ordinaper!=="data_prevcons")? "DESC" : invdir($ascdesc)) .'">' . "Data_prevcons</th>"; 
    echo "<th>Paia Inev.</th>"; 
    echo "<th>Azione</th>"; 
echo "</tr>"; 

Answer 1

如果您已經發送 通過GET來排序 ，爲什麼不發送 ASC，DESC 選項也是，我的意思是，您可以使用1和0代替實際的ASC/DESC，並在您的c中切換它頌，例如：

$ascdesc = ($_GET['ad'])? '0' : '1'; 

而只是添加了var到鏈接

echo "<th>".'<a href="showdbtable.php?sortby=negozio&ad='.$ascdesc.'">' . "Negozio</th>"; 

而且在你的查詢，像

$ascdesc = ($_GET['ad'])? 'asc' : 'desc'; 

的東西在這裏很重要的是，如果你是通過GET接受用戶輸入，你必須清理var以避免SQL注入，不要忘記這一點。

UPDATE：

可能實現用自己的代碼：

$sortby = (isset($_GET['sortby']))? $_GET['sortby'] : "id_ord"; 
$ascdesc = ($_GET['ad']=='asc')? 'ASC' : 'DESC'; 

查詢：

$query = "SELECT id_ord, fornitore, negozio, data_insord, data_prevcons 
      FROM tesord 
      ORDER BY ".$sortby." ".$ascdesc." 
      LIMIT :from_record_num, :records_per_page"; 

鏈接：

echo "<th>".'<a href="showdbtable.php?sortby=fornitore&ad=<?=(($_GET['ad']=='asc')? 'desc' : 'asc';)?>">' . "Fornitore</th>"; 

如果你需要添加的頁面，只需添加當前頁面和排序改變，你還可以添加一個變種的鏈接

echo "<th>".'<a href="showdbtable.php?sortby=fornitore&ad=<?php echo (($_GET['ad']=='asc')? 'desc' : 'asc';)?>&page=<?php echo $_GET['page]?>">' . "Fornitore</th>"; 

還有許多其他的方式來處理分頁和排序，但我認爲，沒有進入很多麻煩，這可能是一個辦法，但是，關於安全性，您可以通過實現類似this

使用mysql_real_escape

你也可以把一切的JavaScript/jQuery的希望這可以讓你更好理解，開心編碼。