在多个页面中分离 SQL 查询

Question

数小时以来，我一直在努力研究如何做到这一点，我设法使用 OFFSET 和 FETCH 获取查询，这将设置要显示的结果数量以及从哪个数字开始，但似乎无法弄清楚如何实际在页脚中使用我的分页，使其显示在新页面上。

对 html、css、php 和 mysql 非常陌生，因此可以边学习边学习，但很难找到有意义的教程。

<?php


     $sql = "SELECT STEAM_ID, Hunters, Smoker, Boomers, Spitters, Jockeys, Charger,
    (Hunters + Smoker + Boomers + Spitters + Jockeys + Charger) as Total_Kills
     FROM Special_Infected_Kills ORDER BY Total_Kills DESC";

    $result = $conn->query($sql);

    if ($result = $conn->query($sql)) {
        echo "<table><tr>
        <th>Player</th>
        <th>Total Kills</th>
        <th>Hunter</th>
        <th>Jockey</th>
        <th>Charger</th>
        <th>Smoker</th>
        <th>Boomer</th>
        <th>Spitter</th>
        </tr>";

      // output data of each row
      while($row = $result->fetch_assoc()) {
      echo "<tr>
      <td>".$row["STEAM_ID"]."</td>
      <td>".$row["Total_Kills"]."</td>
      <td>".$row["Hunters"]."</td>
      <td>".$row["Boomers"]."</td>
      <td>".$row["Spitters"]."</td>
      <td>".$row["Jockeys"]."</td>
      <td>".$row["Charger"]."</td>
      <td>".$row["Smoker"]."</td>
      </tr>";
       }
  echo "</table>";
  } else {
  echo "0 results";
  }
 $conn->close();
 ?>

我的页脚

<footer>

<div class="center">
<div class="pagination">
  <a href="#">&laquo;</a>
  <a href="#" class="active">1</a>
  <a href="#">2</a>
  <a href="#">3</a>
  <a href="#">4</a>
  <a href="#">5</a>
  <a href="#">6</a>
  <a href="#">&raquo;</a>
</div>
</div>

<div class="createdby">
<p> Website built & designed by Blade </p>
</div>

</footer>

所以几乎只希望第一页上的前 20 个结果，然后通过单击页脚中的分页在另一页上每隔 20 个结果

Answer 1

您在问题中提到了FETCH，但不清楚您是指javascript fetch api 还是其他未披露的内容，但以下可能有助于解决分页结果的问题。在没有相关数据库表和数据的情况下，使用另一个表和记录集对以下内容进行了测试以产生分页结果 - 似乎可以正常工作。如果需要，我确信这可以很容易地适应fetch api。

<?php

    /* count all records to begin pagination calculations */
    $sql='select count(*) as `rows` from `special_infected_kills`';
    $res=$db->query( $sql );
    
    $rs=$res->fetch_object();
    $rows=$rs->rows;                    // total number of records in table
    
    $pagesize=20;                       // results per page
    $pages=ceil( $rows / $pagesize );   // calculated total number of pages
    
    
    /*
        deduce or generate the current page. As we want to display ?page=1 rather than ?page=0
        in the querystring the hyperlinks for paging start at 1 but the recordset pages start 
        at zero. Hence subtracting 1 immediately from specified page.
        
        Use the Elvis operator to set alternative value if the filter fails.
    */
    $page=filter_input( INPUT_GET, 'page', FILTER_SANITIZE_NUMBER_INT ) ?: 1;
    $page--;
    
    // ensure the $page is within correct bounds
    if( $page < 0 )$page=1;
    if( $page > $pages )$page=$pages;
    
    
    // construct sql for paged results, supply limit clauses as placeholders.
    $sql = 'SELECT 
            STEAM_ID, Hunters, Smoker, Boomers, Spitters, Jockeys, Charger,
            ( Hunters + Smoker + Boomers + Spitters + Jockeys + Charger ) as `Total_Kills`
        FROM `Special_Infected_Kills` 
        ORDER BY `Total_Kills` DESC
        LIMIT ?, ?';
    
    
    // create the prepared statement, bind and run. Assign results to named variables.
    $stmt=$db->prepare( $sql );
    $stmt->bind_param('ss', $page, $pagesize );
    $res=$stmt->execute();
    $stmt->bind_result( $sid, $hunters, $smoker, $boomers, $splitters, $jockeys, $charger, $kills );
    
    
    
    // display the data for the current page
    $output='
    <table>
        <tr>
            <th>Player</th>
            <th>Total Kills</th>
            <th>Hunter</th>
            <th>Jockey</th>
            <th>Charger</th>
            <th>Smoker</th>
            <th>Boomer</th>
            <th>Spitter</th>
        </tr>';
    
    while( $rs=$stmt->fetch() ){
        $output .= sprintf('
        <tr>
            <td>%s</td>
            <td>%s</td>
            <td>%s</td>
            <td>%s</td>
            <td>%s</td>
            <td>%s</td>
            <td>%s</td>
            <td>%s</td>
        </tr>', $sid, $kills, $hunters, $jockeys, $charger, $smoker, $boomers, $splitters );
    }
    $output .= '
    </table>';
    
    

    /************************************************
        Links for First page, previous, next & last 
        are calculated differently.
    */
    $first= $page > 0 ? '<a class="paging" href="?page=1">First</a>' : '<span>First</span>';
    $prev = $page > 0 ? sprintf('<a class="paging" href="?page=%s">Previous</a>',( max( 1, $page ) ) ) : '<span>Previous</span>';
    $next = $page < $pages ? sprintf('<a class="paging" href="?page=%s">Next</a>',( min( $pages + 1, $page + 2 ) ) ) : '<span>Next</span>';
    $last = $page < $pages ? sprintf('<a class="paging" href="?page=%s">Last</a>', $pages + 1 ) : '<span>Last</span>';
    
    
    $footer=sprintf('
        <footer>
            <div class="center">
                <div class="pagination">
                
                    <!-- text links for prev/next etc -->
                    <div>%s | %s | %s | %s</div>
                    
                    <a class="paging" href="?page=%s">&laquo;</a>', $first, $prev, $next, $last, ( max( 1, $page ) ) );
    
    
    for( $i=1; $i <= $pages + 1; $i++ ){
        $active=$page == $i ? ' active' : '';
        $footer .= sprintf(' <a class="paging%2$s" href="?page=%1$d">%1$d</a> ', $i, $active );
    }
    
    
    
    $footer .= sprintf('
                <a class="paging" href="?page=%s">&raquo;</a>
            </div>
        </div>
        
        <div class="createdby">
            <p>Website built & designed by Blade</p>
        </div>
    </footer>', min( $pages + 1, $page + 2 ));
    
    
    
    // render the html
    echo $output, $footer;
    
?>