你如何使用php PDO fetchobject（）方法与sqlite获取主键字段？

Question

Schema is:
sqlite> .schema posts
CREATE TABLE posts (
id integer primary_key auto_increment,
title text,
content text
);

...

sqlite> .mode line
sqlite> select id,title, content from posts;
     id = 
  title = title
content = content in here

     id = 
  title = a new title
content = new content

.... My entire index.php. This is supposed to be a trivial example.

   // Insert a post into the DB
if (isset($_POST['title']) && isset($_POST['content'])) {
   try {
         // Fill in the values
         $title = $_POST['title'];
         $content = $_POST['content'];

         # echo "title=".$title.", content=".$content;   

         // Create a prepared statement
         $stmt = $db->prepare("INSERT INTO posts (title, content) VALUES (:title, :content);");
         $stmt->bindParam(':title', $title);
         $stmt->bindParam(':content', $content);

         $stmt->execute();
      } catch (Exception $e) {
         die ($e);
   }
}

// Get posts from database
try {
   $posts = $db->prepare('SELECT id, title, content FROM posts;');
   $posts->execute();
} catch (Exception $e) {
   die ($e);
}

?>

<h1>Posts - SQLite Example</h1>

<?php while ($post = $posts->fetchObject() ): ?>
<br/>     
<h2><?php echo $post->title ?></h2>
<?php echo $post->content ?>
<a href="<?php echo $_SERVER['PHP_SELF']; ?>?action=delete&id=<?php echo $post->id ?>"><br/>Delete Post</a>
<?php endwhile; ?>

<hr />

<h2>Add new Post</h2>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">

<p>
<label for="title">Title:</label>
<input type="text" name="title" />
</p>

<p>
<textarea name="content" rows="8" cols="50"></textarea>

My problem is that $post->id is empty, but should have been mapped to the $post variable according to the documentation for fetchObject().

I really am just trying to get the primary key of the row I'm displaying so as to add a delete link.

Note that I can open, read, and write the database without issue. Also title and content are retrieved properly but I'm just stuck on getting the id field from the object returned by fetchObject().

It seems sqlite may never actually be putting anything in the id field of the table.

UPDATE:The answer may have been here all along. It was actually a sqlite issue not a php one.