表单是不是将数据发布到MySQL数据库中?

Trying to get this form to add new data into my database yet for some reason it doesn't seem to work? Instead of staying on the same page "admin.php?page=3" it redirects to just "admin.php" and no echos or signs that it is even doing anything? Could someone help me out here? Cheers!

Form:

<form>
<form name="postnewstory" action="admin.php?page=3" method="POST">
<strong>News Title: </strong><input type="text" name="news_title"><br><br />
<strong>News Story:</strong><br>
<textarea name="news_body" rows="4" cols="60"></textarea><br><br />

<input type="file" name="news_photo"><br>
<strong>Story Link: </strong><br />
<input name="button" type="radio" value="0" checked="checked">No Link<br>
<input type="radio" name="button" value="1">Link<br><br />
<strong>Link Address: </strong><input type="text" name="news_link"><br>
<strong>News Story Tags: </strong><input type="text" name="news_tags">    
<input type="submit" value="Post" name="postnewstory" class="btn btn-success"><br />
</form>

PHP: I know its very basic, just trying to get it to work before I add error checks or anything.

<?php
if (isset($_POST['postnewstory'])){
    $username = $user_data['username'];
    $email_address = $user_data['email_address'];
    $news_title = $_POST['news_title'];
    $news_photo = $_POST['news_photo'];
    $button = $_POST['button'];
    $news_link = $_POST['news_link'];
    $news_tags = $_POST['news_tags'];

$exists = mysql_query ("SELECT * FROM users WHERE username='$username'") or die ("not found");
    if (mysql_num_rows($exists) != 0){
        //update the info in database
        mysql_query ("INSERT INTO news (`news_id` ,`news_title` ,`news_body` ,`news_photo` ,`news_date` ,`username` ,`news_tags` ,`button ,`news_link`)
        VALUES (NULL , '$news_title', '$news_body', '$news_photo', now(), '$username', '$news_tags', '$button', '$news_link');") or die ("update didn't work");

        echo "<div class='alert alert-success'><strong>This post was sent!</strong></span></div> ";
        echo '<meta http-equiv="refresh" content="2;url=admin.php?page=3">';
} else echo "<strong><font color=red>Update did not work, please try again.</font></strong>";
}
?>   

You have a missing backtick in:

,`button 

change to:

,`button`

Rewrite:

("INSERT INTO news (`news_id` ,`news_title` ,`news_body` ,`news_photo` ,`news_date` ,`username` ,`news_tags` ,`button`,`news_link`)

Footnotes:

I quote Shankar:

"Replace die ("update didn't work"); with die (mysql_error()); to know the exact error why your query ain't working."

I think this should work; Change the line

echo '<meta http-equiv="refresh" content="2;url=admin.php?page=3">';

to

echo "<script>window.location = 'admin.php?page=3';</script>";