Jump to content

Navigating database results and posting new values


zemax

Recommended Posts

I am trying to dynamically display results that I retrieve from my database i.e. only 5 results per page and code should automatically compute how many pages it needs and create links for each page. I have also added a link at the top of my page so that if user wants to POST new data he can post it. Problem is that when I click on page 2 or 3 or any numbered page and click on POST link it gives me following error

"CGI Error

The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are:

 

And it did not tell about any header etc. I have pasted my code below. Please guide me. Thanks

 


<head>
<h2>POST</h2>
<a href="post.php"><b><font size="4">Post!!</font></b></a>
</head>

<?php

if(!isset($_GET['page'])){ 
    $page = 1; 
} else { 
    $page = $_GET['page']; 
} 

// Define the number of results per page 
$max_results = 5; 

// Figure out the limit for the query based 
// on the current page number. 
$from = (($page * $max_results) - $max_results);  

// Perform MySQL query on only the current page number's results 

$sql = mysql_query("SELECT * FROM MYDB LIMIT $from, $max_results"); 

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

echo "<hr>";

   	echo "<b><font color='#660000' size='4'>".$row['NAME']."</font></b>";
echo "<br>\n";
    
    } 

// Figure out the total number of results in DB: 
$total_results = mysql_result(mysql_query("SELECT COUNT(*) as Num FROM MYDB"),0); 

$total_pages = ceil($total_results / $max_results); 

// Build Page Number Hyperlinks 
echo "<hr><center>Select Page<br />"; 

// Build Previous Link 
if($page > 1){ 
    $prev = ($page - 1); 
    echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$prev\"><<Previous</a> "; 
} 

for($i = 1; $i <= $total_pages; $i++){ 
    if(($page) == $i){ 
        echo "$i "; 
        } else { 
            echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$i\">$i</a> "; 
    } 
} 

// Build Next Link 
if($page < $total_pages){ 
    $next = ($page + 1); 
    echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$next\">Next>></a>"; 
} 
echo "</center>"; 
?> 

Link to comment
Share on other sites

If it didn't list any headers then that's probably your problem right there.

Browsers require headers from the server.

 

Sorry I am a new programmer. What kind of headers do I need to send to server? can you guide me or point me to some place where I can read about it and see examples?

Link to comment
Share on other sites

This thread is more than a year old. Please don't revive it unless you have something important to add.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.