Hello,
i am a beginner with all of this, so have some mercy with me please..
After adding a comment in phpmyadmin, it doesn't show up in "blog_list.php".
Also when clicking on the "TEST post"-link "blog_read.php?pid=1", i get these errors:
"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''posts' WHERE 'post_id' = 1' at line 1
Warning: mysql_result() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\core\inc\posts.inc.php on line 9
Invalid post ID. "
Here is my "posts.inc.php":
[syntax=php]<?php
//checks if the given post id is in the table.
function valid_pid($pid){
$pid = (int)$pid;
$total = mysql_query("SELECT COUNT('post_id')FROM 'posts' WHERE 'post_id' = {$pid}");
echo mysql_error();
$total = mysql_result($total, 0);
if($total != 1){
return false;
}
else{
return true;
}
}
//fetches a summery of all the blog posts.
function get_posts(){
$sql = "SELECT
`posts`.`post_id` AS `id`,
`posts`.`post_title` AS `title`,
LEFT(`posts`.`post_body`, 512) AS `preview`,
`posts`.`post_user` AS `user`,
DATE_FORMAT(`posts`.`post_date`, '%d/%m/%Y %H:%i:%s') AS `date`,
`comments`.`total_comments`,
DATE_FORMAT(`comments`.`last_comment`, '%d/%m/%Y %H:%i:%s') AS `last_comment`
FROM `posts`
LEFT JOIN (
SELECT
`post_id`,
COUNT(`comment_id`) AS `total_comments`,
MAX(`comment_date`) AS `last_comment`
FROM `comments`
GROUP BY `post_id`
) AS `comments`
ON `posts`.`post_id` = `comments`.`post_id`
ORDER BY `posts`.`post_date` DESC";
$posts = mysql_query($sql);
$rows = array();
while (($row = mysql_fetch_assoc($posts)) !== false) {
$rows[] = array(
'id' => $row['id'],
'title' => $row['title'],
'preview' => $row['preview'],
'user' => $row['user'],
'date' => $row['date'],
'total_comments' => ($row['total_comments'] === null) ? 0 : $row['total_comments'],
'last_comment' => ($row['last_comment'] === null) ? 'never' : $row['last_comment']
);
}
return $rows;
}
//fetches a single post from the table.
function get_post($pid){
$pid = (int)$pid;
$sql = "SELECT
`post_title` AS `title`,
`post_body` AS `body`,
`post_user` AS `user`,
`post_date` AS `date`
FROM `posts`
WHERE `post_id` = {$pid}";
$post = mysql_query($sql);
$post = mysql_fetch_assoc($post);
$post['comments'] = get_comments($pid);
return $post;
}
//adds a blog entry.
function add_posts($name, $title, $body){
$name = mysql_real_escape_string(htmlentities($name));
$title = mysql_real_escape_string(htmlentities($title));
$body = mysql_real_escape_string(nl2br(htmlentities($body)));
mysql_query("INSERT INTO `posts` (`post_user`, `post_title`, `post_body`, `post_date`) VALUES ('{$name}', '{$title}', '{$body}', NOW())");
}
?>[/syntax]
"comments.inc.php"
[syntax=php]<?php
//fetches all of the comments for a given blog post.
function get_comments($pid){
$pid = (int)$pid;
$sql = "SELECT
`comment_body` AS `body`,
`comment_user` AS `user`,
DATE_FORMAT(`comment_date`, '%d/%m/%Y %H:%i:%s') AS `date`
FROM `comments`
WHERE `post_id` = {$pid}";
$comments = mysql_query($sql);
$return = array();
while (($row = mysql_fetch_assoc($comments)) !== false){
$return[] = $row;
}
return $return;
}
//adds a comment.
function add_comment($pid, $user, $body){
if(valid_pid($pid) === false){
return false;
}
$pid = (int)$pid;
$user = mysql_real_escape_string(htmlentities($user));
$body = mysql_real_escape_string(nl2br(htmlentities($body)));
mysql_query("INSERT INTO `comments` (`post_id`, `comment_user`, `comment_body`, `comment_date`) VALUES ({$pid}, '{$user}', '{$body}', NOW())");
return true;
}
?>[/syntax]
"blog_read.php"
[syntax=php]<?php
include('core/init.inc.php');
?>
<!DOCTYPE html PUBLIC ".//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org//1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test Title</title>
</head>
<body>
<div>
<?php
if (isset($_GET['pid']) === false || valid_pid($_GET['pid']) === false){
echo 'Invalid post ID.';
}else{
$post = get_post($_GET['pid']);
?>
<h2><?php echo $post['title']; ?></h2>
<h4>By <?php echo $post['user'] ?> on <?php echo $post['date']; ?> (<?php echo count($post['comments']); ?> comments)</h4>
<hr />
<p></p>
<hr />
<form action="" method="post">
<p>
<label for="user">Name</label>
<input type="text" name="user" id="user"/>
</p>
<p>
<textarea name="body" rows="20" cols="60"></textarea>
</p>
<p>
<input type="submit" value="Add Comment" />
</p>
</form>
<?php
}
?>
</div>
</body>
</html>[/syntax]
"blog_list.php"
[syntax=php]<?php
include('core/init.inc.php');
?>
<!DOCTYPE html PUBLIC ".//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org//1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test Title</title>
</head>
<body>
<div>
<?php
$posts = get_posts();
foreach($posts as $post){
?>
<h2><a href="blog_read.php?pid=<?php echo $post['id']; ?>"><?php echo $post['title']; ?></a></h2>
<h4>By <?php echo $post['user']; ?> on <?php echo $post['date']; ?></h4>
<h4>(<?php echo $post['total_comments']; ?> comments, last comment <?php echo $post['last_comment']; ?>)</h4>
<hr />
<p><?php echo $post['preview']; ?></p>
<?php
}
?>
</div>
</body>
</html>[/syntax]
Blog Tutorial, Invalid post ID. and other errors..
Re: Blog Tutorial, Invalid post ID. and other errors..
Well, the SQL syntax error is because you're using semiquotes( ' ) instead of backticks( ` )
This:
[syntax=php]$total = mysql_query("SELECT COUNT('post_id')FROM 'posts' WHERE 'post_id' = {$pid}");[/syntax]
Should be this:
[syntax=php]$total = mysql_query("SELECT COUNT(`post_id`)FROM posts WHERE 'post_id' = {$pid}");[/syntax]
This:
[syntax=php]$total = mysql_query("SELECT COUNT('post_id')FROM 'posts' WHERE 'post_id' = {$pid}");[/syntax]
Should be this:
[syntax=php]$total = mysql_query("SELECT COUNT(`post_id`)FROM posts WHERE 'post_id' = {$pid}");[/syntax]
Re: Blog Tutorial, Invalid post ID. and other errors..
hey, that was fast. 
now i only need some solutions for the "Invalid post ID." + no comments problem..
now i only need some solutions for the "Invalid post ID." + no comments problem..
Re: Blog Tutorial, Invalid post ID. and other errors..
what does your database structure look like?
Re: Blog Tutorial, Invalid post ID. and other errors..
Edit: ..ok, i solved the comment problem..with setting also post id to 1....
now only "Invalid post ID"...
see attachment
now only "Invalid post ID"...
see attachment
Re: Blog Tutorial, Invalid post ID. and other errors..
Oh, I must have been very tired yesterday...
This is how the valid_pid query should look... Silly me
[syntax=php]$total = mysql_query("SELECT COUNT(`post_id`)FROM `posts` WHERE `post_id` = '{$pid}'");[/syntax]
This is how the valid_pid query should look... Silly me
[syntax=php]$total = mysql_query("SELECT COUNT(`post_id`)FROM `posts` WHERE `post_id` = '{$pid}'");[/syntax]
Re: Blog Tutorial, Invalid post ID. and other errors..
i saw that yesterday too, but didnt changed it for some reasons..
hm, but still it shows me "invalid post id"..
EDIT: ok, i solved it lol. http://localhost//blog_read.php?pid=1 was the right link, and not just http://localhost//blog_read.php ..duh. well it actually didnt work on both links before, because of the other errors.
so, THANK YOU VERY MUCH for your fast help!!
hm, but still it shows me "invalid post id"..
EDIT: ok, i solved it lol. http://localhost//blog_read.php?pid=1 was the right link, and not just http://localhost//blog_read.php ..duh. well it actually didnt work on both links before, because of the other errors.
so, THANK YOU VERY MUCH for your fast help!!
Re: Blog Tutorial, Invalid post ID. and other errors..
No problems. You're always welcome back if you're in need of further assistance.