Creating Dynamic Links with PHP/MySQL - php

Question

i'm creating my first PHP/MySQL site and i'm having difficulty figuring out how to generate dynamic links and creating a new page for those links.
My index page is pulling in certain details from my database as a preview, and when the visitor clicks on that item, i want them to be taken to a page which shows the full information from the database for that row.
The code on my index page for displaying the previews is below, any help on amending it to generate the link and page would be greatly appreciated.
<?php
$query="SELECT * FROM $tbl_name ORDER BY job_id DESC";
$result=mysql_query($query);
$num=mysql_numrows($result);
mysql_close();
$i=0;
while ($i < $num) {
$f1=mysql_result($result,$i,"company_name");
$f2=mysql_result($result,$i,"job_title");
$f3=mysql_result($result,$i,"city");
$f4=mysql_result($result,$i,"country");
$job_id=mysql_result($result,$i,"job_id");
?>
<div class = "hjl">
<ul>
<li id = "jobtitle"><?php echo $f2; ?></li><br />
<li id = "compname"><?php echo $f1; ?></li>
</ul>
<ul>
<li id = "city"><?php echo $f3; ?>, <?php echo $f4; ?></li><br />
</ul>
</div>
<?php
$i++;
}
?>
I'm pretty sure what i'm asking is really simple, i just can't get my head around acheieving it.

Answer 1

Thanks to you both for your answers, but i have managed to fix it (or work-around it) with this on my index page:
<?php
$query="SELECT * FROM $tbl_name ORDER BY job_id DESC";
$result=mysql_query($query) or die(mysql_error());
$rsjobinfo=mysql_fetch_assoc($result);
mysql_close();
do {?>
<div class = "hjl"><a href="paging.php?job_id=<?php echo $rsjobinfo['job_id'];?>">
<ul>
<li id = "jobtitle"><?php echo $rsjobinfo['job_title'];?></li><br />
<li id = "compname"><?php echo $rsjobinfo['company_name'];?></li>
</ul>
<ul>
<li id = "city"><?php echo $rsjobinfo['city'];?>,
<?php echo $rsjobinfo['country'];?></li>
</ul>
</a>
</div>
<?php } while ($rsjobinfo=mysql_fetch_assoc($result))?>
</div>
Followed by this on my content page:
<?php
$job_id = $_GET['job_id'];
$query="SELECT * FROM $tbl_name WHERE job_id = $job_id";
$result=mysql_query($query) or die(mysql_error());
$rsjobinfo=mysql_fetch_assoc($result);
mysql_close();
?>
Thanks for your help everyone.
Dan

Answer 2

put mysql_close after you use mysql_result, but once you get it working you might look into a more modern approach like PDO.

Answer 3

to your code add link (which I think you already have somewhere):
//...................
<li id = "jobtitle">
<a href="<?php echo '?id='.$job_id; ?>">
<?php echo $f2; ?>
</a>
</li>
//...................
Read more...
//...................
then your code must check for variable $_GET['id'], so put IF in the beginning of your code:
$where = '';
if( isset($_GET['id']) && strlen($_GET['id']) > 0 ) {
$where = ' job_id = "'. mysql_real_escape_string( $_GET['id'] ) .'"' ;
}
<?php
$query="SELECT * FROM $tbl_name $where ORDER BY job_id DESC";
$result=mysql_query($query);
$num=mysql_numrows($result);
mysql_close();
$i=0;
while ($i < $num) {
$f1=mysql_result($result,$i,"company_name");
$f2=mysql_result($result,$i,"job_title");
$f3=mysql_result($result,$i,"city");
$f4=mysql_result($result,$i,"country");
$job_id=mysql_result($result,$i,"job_id");
?>
<div class = "hjl">
<ul>
<li id = "jobtitle">
<a href="<?php echo '?id='.$job_id; ?>">
<?php echo $f2; ?>
</a>
</li><br />
<li id = "compname"><?php echo $f1; ?></li>
</ul>
<ul>
<li id = "city"><?php echo $f3; ?>, <?php echo $f4; ?></li><br />
</ul>
Read more...
</div>
<?php
$i++;
}
?>
edit: Try changing the following line:
$where = " job_id = '". mysql_real_escape_string( $_GET['id'] ) ."'" ;