Блог

Я хотел бы создать кнопки, которые изменяют сортировку выходных данных базы данных. Я запрашиваю одну таблицу и выдаю результаты с некоторым классом разбивки на страницы. Я могу легко УПОРЯДОЧИТЬ результаты по столбцам по возрастанию или убыванию.

 $sql = "SELECT id, name, address FROM restaurant WHERE accepted = '1' ORDER BY id DESC";
$pagination = new Pagination();
$pagination->page = $_GET['page'];
$pagination->perPage = 10;
$pagination->classNormal = 'someClass';
$pagination->classSelected = 'someClass2';
$pagination->sql($sql);
 

Затем в цикле while у меня есть эти результаты и еще один mysql auery.

 while($row = $pagination->getRows()) {
$sql2 = "SELECT COUNT(DISTINCT prod_name) AS nr_of_prod FROM menu WHERE id = '".$row['id']."'" ;                
$do1->doQuery($sql2);
$row_amount = $do1->getRows();
//... and here is some data output
 

Теперь вопрос в том, как я могу отсортировать / упорядочить все результаты подкачки по столбцам из этого второго запроса (например, по nr_of_prod)?

Поместите второй запрос прямо в первый:

 SELECT id, name, address,
       (SELECT COUNT(DISTINCT prod_name) nr_of_prod
        FROM menu
        WHERE menu.id = restaurant.id
       ) nr_of_prod
FROM restaurant
WHERE accepted = '1'
ORDER BY id DESC
 

Кроме того, почему вы используете какой-то класс нумерации страниц вместо использования MySQL LIMIT ?

Вы также можете написать это так (профилируйте оба и выберите, лучший зависит от относительного размера таблиц):

 SELECT id, name, address, nr_of_prod
FROM restaurant JOIN
     (SELECT id, COUNT(DISTINCT prod_name) nr_of_prod
      FROM menu
      GROUP BY id
     ) nr_of_prod USING (id)
WHERE accepted = '1'
ORDER BY id DESC
 

Я взял этот код разбивки на страницы с другого сайта, и он отлично работает на моих страницах… НЕТ: это не мой код, и я не претендую на него как таковой.

     /*
    Place code to connect to your DB here.
*/
include('config.php');  // include your code to connect to DB.

$tbl_name="";       //your table name
// How many adjacent pages should be shown on each side?
$adjacents = 3;

/* 
   First get total number of rows in data table. 
   If you have a WHERE clause in your query, make sure you mirror it here.
*/
$query = "SELECT COUNT(*) as num FROM $tbl_name";
$total_pages = mysql_fetch_array(mysql_query($query));
$total_pages = $total_pages[num];

/* Setup vars for query. */
$targetpage = "filename.php";   //your file name  (the name of this file)
$limit = 30;                                //how many items to show per page
$page = $_GET['page'];
if($page) 
    $start = ($page - 1) * $limit;          //first item to display on this page
else
    $start = 0;                             //if no page var is given, set start to 0

/* Get data. */
$sql = "SELECT column_name FROM $tbl_name LIMIT $start, $limit";
$result = mysql_query($sql);

/* Setup page vars for display. */
if ($page == 0) $page = 1;                  //if no page var is given, default to 1.
$prev = $page - 1;                          //previous page is page - 1
$next = $page   1;                          //next page is page   1
$lastpage = ceil($total_pages/$limit);      //lastpage is = total pages / items per page, rounded up.
$lpm1 = $lastpage - 1;                      //last page minus 1

/* 
    Now we apply our rules and draw the pagination object. 
    We're actually saving the code to a variable in case we want to draw it more than once.
*/
$pagination = "";
if($lastpage > 1)
{   
    $pagination .= "<div class="pagination">";
    //previous button
    if ($page > 1) 
        $pagination.= "<a href="$targetpage?page=$prev"><<- PREVIOUS</a>";
    else
        $pagination.= "<span class="disabled"><<- PREVIOUS</span>";   

    //pages 
    if ($lastpage < 7   ($adjacents * 2))   //not enough pages to bother breaking it up
    {   
        for ($counter = 1; $counter <= $lastpage; $counter  )
        {
            if ($counter == $page)
                $pagination.= "<span class="current">$counter</span>";
            else
                $pagination.= "<a href="$targetpage?page=$counter">$counter</a>";                 
        }
    }
    elseif($lastpage > 5   ($adjacents * 2))    //enough pages to hide some
    {
        //close to beginning; only hide later pages
        if($page < 1   ($adjacents * 2))        
        {
            for ($counter = 1; $counter < 4   ($adjacents * 2); $counter  )
            {
                if ($counter == $page)
                    $pagination.= "<span class="current">$counter</span>";
                else
                    $pagination.= "<a href="$targetpage?page=$counter">$counter</a>";                 
            }
            $pagination.= "...";
            $pagination.= "<a href="$targetpage?page=$lpm1">$lpm1</a>";
            $pagination.= "<a href="$targetpage?page=$lastpage">$lastpage</a>";       
        }
        //in middle; hide some front and some back
        elseif($lastpage - ($adjacents * 2) > $page amp;amp; $page > ($adjacents * 2))
        {
            $pagination.= "<a href="$targetpage?page=1">1</a>";
            $pagination.= "<a href="$targetpage?page=2">2</a>";
            $pagination.= "...";
            for ($counter = $page - $adjacents; $counter <= $page   $adjacents; $counter  )
            {
                if ($counter == $page)
                    $pagination.= "<span class="current">$counter</span>";
                else
                    $pagination.= "<a href="$targetpage?page=$counter">$counter</a>";                 
            }
            $pagination.= "...";
            $pagination.= "<a href="$targetpage?page=$lpm1">$lpm1</a>";
            $pagination.= "<a href="$targetpage?page=$lastpage">$lastpage</a>";       
        }
        //close to end; only hide early pages
        else
        {
            $pagination.= "<a href="$targetpage?page=1">1</a>";
            $pagination.= "<a href="$targetpage?page=2">2</a>";
            $pagination.= "...";
            for ($counter = $lastpage - (2   ($adjacents * 2)); $counter <= $lastpage; $counter  )
            {
                if ($counter == $page)
                    $pagination.= "<span class="current">$counter</span>";
                else
                    $pagination.= "<a href="$targetpage?page=$counter">$counter</a>";                 
            }
        }
    }

    //next button
    if ($page < $counter - 1) 
        $pagination.= "<a href="$targetpage?page=$next">NEXT ->></a>";
    else
        $pagination.= "<span class="disabled">NEXT ->></span>";
    $pagination.= "</div>n";       
}



    while($row = mysql_fetch_array($result))
    {

    // Your while loop here

    }
?>