Question

下面有两个代码 - 首先使用没有预准备语句的mysqli，第二个使用预准备语句不起作用。在第二个，问题是在while循环中的第二个查询。我可以使用mysqli和预编程语句在循环中使用查询吗？

代码＃1有效：

  $sql = "SELECT * FROM topics ORDER BY topic_id DESC";
    $result = $mysqli->query($sql);

<?php   while($row = $result->fetch_assoc()) {
  $topic_id = $row['topic_id'];

  ?>

 <div class="brpostova col-md-2">Postova: 
         <?php
         $sql2 = "SELECT * FROM postovi WHERE post_topic = $topic_id ";
         $rezultat = $mysqli->query($sql2);
         echo $rezultat->num_rows;
?>

</div>
        <div class="autor col-md-2">Posted by <a href="#"><?php echo $row['topic_autor']; ?></a></div>

 <?php 
}
     $result->free
?>

代码＃2不起作用：

$stmt = $mysqli->prepare("SELECT * FROM topics ORDER BY topic_id DESC");
$stmt->execute();
$stmt->bind_result($id, $sadrzaj, $naslov, $datum, $kategorija, $autor, $sticky, $closed);

<?php while ($stmt->fetch())    {
      $topic_id = $id;

      ?>

     <div class="brpostova col-md-2">Postova: 
             <?php
             $post = $mysqli->prepare("SELECT * FROM postovi WHERE post_topic = ? ");
                  $post->bind_param('i', $topic_id);
                  $post->execute();
                  $post->store_result();
                  $numrows = $post->num_rows;
                  $post->close();
                echo $numrows
    ?>

    </div>
            <div class="autor col-md-2">Posted by <a href="#"><?php echo $autor; ?></a></div>

     <?php 
    }
         $stmt->free_result();
         $stmt->close();
    ?>

在循环中查询 - 使用预准备语句的mysqli

0 个答案: