mysql error: You have an error in your SQL syntax;

My old problem is solved, but im running into a new error. I figured I would start a new topic, sorry if this was incorrect to do.

mysql error: 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 'AND A.ID = P.ID' at line 4

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<?php

/* Display a vote form. */

require_once("vote_config.php");

$poll = $_GET['poll'];
 
/*if (!is_numeric($poll)) 

  {

    die("Invalid poll");

  }*/
 
/* Look up the poll in the database. */

$sql = "SELECT P.question, A.answer, A.answer_ID

          FROM poll P, answer A

         WHERE P.ID = $poll

           AND A.ID = P.ID";
 
$result = mysql_query($sql, $db) or die ("mysql error: " . mysql_error());
 
if (mysql_num_rows($result) == 0) 

  {

    die('Invalid poll.');

  }
 
/* If the user has already voted, show the results. */

if ($_COOKIE["poll_voted_$poll"]) {

    header("Location: vote_tally.php?poll=$poll");

    exit;

}
 
/* Vote form */

$question_list = "";

while($row = mysql_fetch_array($result)) {

    $question = $row['question'];

    $question_list .= '<li><input name="answer" type="radio" value="' .

                      $row['answer_ID'] . '"> ' . $row['answer'] .

                      '</li>';

}

?>

<html>

<head></head>

<body>

<span style="font-size: 12px;">

<span style="font-weight: bold; font-size: 14px;">

    Poll #<?php print $poll; ?>

</span><br />

<span style="font-weight: bold"><?php print $question; ?></span>

<form action="vote_process.php" method="post">

<ul style="list-style-type: none;">

<?php print $question_list; ?>

</ul>

<input name="poll" type="hidden" value="<?php print $poll; ?>">

<input name="" type="submit" value="Vote!">

</form>

</span>

</body></html

The part I commented out:

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 /*if (!is_numeric($poll)) 

  {

    die("Invalid poll");

  }*/

Kept returning invalid poll, even though it is not invalid, and the table is populated. How do I get rid of these errors? Thanks in advance.

EDIT: on line 14 I put ' ' around $poll and commented out:

Expand|Select|Wrap|Line Numbers

 /*if (!is_numeric($poll)) 

  {

    die("Invalid poll");

  }*/

and

Expand|Select|Wrap|Line Numbers

 /*if (mysql_num_rows($result) == 0) 

  {

    die("Invalid poll.");

  }*/

the code runs, but the poll isnt populated. You can check it out at http://www.ruckusinc.net/projects/vote_form.php

Feb 18 '10 #1

Subscribe Post Reply

2743

Atli

5,058

Expert 4TB

Hey.

The part you commented out is there to validate the $_GET['poll'] value. If it keeps telling you it is invalid, odds are that it is invalid. Commenting the validation code out won't make the input valid :)

Try un-commenting that and adding a var_dump() before the die().

Expand|Select|Wrap|Line Numbers

 if (!is_numeric($poll))

{

    var_dump($poll);

    die("Invalid poll");

}

Also, when a SQL query fails and you can't spot the problem, it is always a good idea to print the query, just to see what is really going on.

Feb 18 '10 #2

jaymzlx

I put in the var_dump($poll); and uncommented that section and it returned NULL.
That's weird because I have information in that table I am trying to get

EDIT: Its gotta be something with the line

Expand|Select|Wrap|Line Numbers

$poll = $_GET['poll'];

that is goofing up the code.

Feb 18 '10 #3

Atli

5,058

Expert 4TB

That line simply fetches the poll variable from the URL.

Your URL should be looking something like:
- http://example.com/page.php?poll=1

If you leave out the ?poll=1 part the $poll variable will be NULL and the die("Invalid poll"); statement is executed. - I assumed that was the reason you put it there; to let you know the poll ID was missing.

Feb 18 '10 #4

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