Question

好吧所以我从头开始创建了一个博客，错误地开始用mysql_语句编写它，所以我回去用PDO语句重写它。我现在遇到了从我的数据库显示我的博客文章的问题。

<?php
    include 'includes.php';

    echo '<h3>-----------------------------------------------------</h3>';
    $blogIndex = 'SELECT * FROM blog_post ORDER BY date_posted DESC';
    $blogIndexstmt = $DBH->prepare($blogIndex);
    $blogIndexRows = $blogIndexstmt->fetchAll();

    if(!$blogIndexRows) {
        echo 'No Post Yet.';
    }
        else {
            while($blogIndexRows->nextRowset()) {
                echo '<h2>' . $row['title'] . '</h2>';
                $datePosted = $row['date_posted'];
            echo '<p>' . gmdate('F j, Y, g:i a', $datePosted) . '</p>';
                $body = substr($row['post'], 0, 300);
                echo nl2br($body) . '...<br/>';
                echo '<a href="post_view.php?id=' . $row['id']. '">Read More</a> | ';
                echo '<a href="post_view.php?id=' . $row['id'] . '#comments">' .              
                $row['num_comments'] . ' comments</a>';
                echo '<hr/>';
            }
       }
       $DBH = null;
       echo <<<HTML
       <a href="post_add.php">+ New Post</a>
       HTML;
 ?>

它不显示任何内容，甚至不显示错误代码。我能够使用mysql_语句正确地完成它，但我真的想学习如何正确地做到这一点。我正在寻找正确方向的推动，你现在必须为我编码。感谢您提前帮助！

Answer 1

让我们从头开始。

如果您没有传递任何参数，则不使用预准备语句。

这是什么意思？只需发出PDO的query功能即可。

就像这样：

$query = $DBH->query('SELECT * FROM blog_post ORDER BY date_posted DESC');

如果出现问题，$ DBH-＆gt;查询将在成功时返回FALSE或PDOStatement。所以下一行是检查它是否为假：

if($query === false)
{
    echo $DBH->errorCode();
}
else 
{
    // Everything went fine, let's fetch results
    $results = $query->fetchAll(PDO::FETCH_ASSOC);

    // If there are any records returned, our array won't be empty.
    if(count($results))
    {
        // $results contains all of your records. You can now loop it with for, foreach and you don't need a while loop anymore
        foreach($results as $row)
        {
            print_r($row);
        }
    }
    else
    {
        echo "There are no records in the database table :(";
    }
}

PDO语句不显示提取的结果

1 个答案: