Question

我从我的代码中收到以下错误消息：“未捕获的mysqli_sql_exception：命令不同步；您现在不能运行此命令”。我从这个网站上的类似问题知道这意味着什么我尝试做的事情很简单，但是除了我做过的之外，我不知道该怎么做。我已经读过使用PDO的可能性，但是我还没有真正掌握PDO，还有其他方法可以实现吗？

我有一个页面，允许用户从数据库中删除记录，因此有一个delete命令和select命令可以检索数据库中的记录。即使我收到显示的错误消息，删除命令仍在运行。

这不是我页面上的所有代码，而是适用于此问题的所有代码：

<?php
$deletepost = 'none';
$deleteposterror = 'none';
$show_div = 'none';
$hide_div = 'show';
?>
<?php

    if(isset($_POST['topic_id_value'])) {

    $del_topic_id = $_POST['topic_id_value'];

    // sql to delete a record
    $pass_fail = "DELETE FROM topics WHERE topic_id ='$del_topic_id';";

    $pass_fail .= "DELETE FROM posts WHERE topic_id_post ='$del_topic_id'";

    if (mysqli_multi_query($conn, $pass_fail)) {

    $deletepost = 'show';

    }else{

    $deleteposterror = 'show';
    echo "ERROR: Could not able to execute $pass_fail. "  . mysqli_error($conn);    

    }

}

?>

<?php
        $sql1 = "SELECT * FROM topics WHERE topic_by = '".$id."' AND has_comment = '0'";
        $result=$conn->query($sql1);

       if ($result->num_rows === 0) {

            $show_div = 'show';
            $hide_div = 'none';

        }else if ($result->num_rows > 0) {



    ?>



            <?php
                while($row = $result->fetch_assoc()) {

            $topic_id = $row ['topic_id'];
            $topic_subject = $row ['topic_subject']; 
            $my_date = $row['topic_date'];
            $date = DATE("G:i:s d/m/Y",strtotime($my_date));
                ?>  

            <div class='chat_post_titles' >
            <div class='row'>
            <div class='col-md-7 chat_post_text_align_left'>
            <a href="../Chat/post.php?topic_id=<?php echo $topic_id?>"><?php echo $topic_subject?>.</a>
            </div>
            <div class='col-md-2 chat_post_text_align_right'>
            <div class='hide_text'>Post Date: </div>
            <?php echo $date?>
            </div>
            <div class='col-md-2 chat_post_text_align_centre'>
            <div class='hide_text'>Delete Post: </div>

            <form method="post" onSubmit="return submit();" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
            <input type="hidden" name="topic_id_value" id="topic_id_value" value="<?php echo $topic_id?>">
            <button type="submit" class="btn btn-danger buttonElement">Delete</button>
            </form>
            </div>
            </div>
            </div>
            <?php
                    }


        }
                ?>

命令不同步，无法计算出正确的代码顺序

0 个答案: