Display data for specific ID - php

Question

I have been trying for a while to figure out how to display data from a specific row within my database based on the ID.
Say I want the link to be survivaloperations.net/page/mso?p=contracts&id=#
where id=# is the ID of the row I am pulling data from in the database
How would I pull and display data from the database using a link like shown above?
I Tried to google it, but didn't really know what to google to find related things
Any help or links for references are appreciated!
Here is what I had tried:
<?php
if ($p == contracts) {
$id = isset($_GET['id']) ? (int)$_GET['id'] : 0; // if $_GET['id'] exists, return it as an integer, otherwise use a sentinel, id's usually start with 1, so 0 works
if ($id != 0):
// I assume this is a specific news item meaning you know it's ONE result
$query = 'SELECT * FROM contracts WHERE id=' . $id . ' LIMIT 1'; // so try to use limit 1, no need to add extra steps in the database lookup
endif;
mysql_select_db('survival_contracts');
$result = mysql_query($query);
//$result = mysql_query($query) or die(mysql_error());
// now loop through the results
while ($row = mysql_fetch_array($result)) {
// and use'em however you wish
echo("<div class='mso_body_wrap'>
<div id='mso_news_container'>
<div class='mso_news_wrap'>
<div class='mso_news_top'>$row2[contract_type]</div>
<div class='mso_news_poster'>
<div class='mso_poster_avatar'><img src='images/tank.jpg'></div>
<div class='mso_poster_info'>for <a
href='#'>$row2[unit]</a><br/>by: <a
href='http://www.survivaloperations.net/user/$row2[userid]-$row2[username]/'>$row2[username]</a>
</div>
</div>
<div class='mso_news_content'>
<div class='mso_news_body'>
Callsign: $row2[callsign]<br/>
Urgency: $row2[urgency]<br/>
Location: $row2[location]<br/>
Grid: $row2[grid]<br/>
Enemy Activity: $row2[enemy_activity]<br/>
Hours Since Lasrt Contact: $row2[contact_hours]<br/><br/>
Supplies Requested: $row2[supplies]<br/>
Comments: $row2[comments]
</div>
</div>
<div class='mso_news_bottom'></div>
</div>
</div>");
}
?>

Answer 1

I figured it out with my original code:
if ($p == contracts)
{
$cid = $_GET['id']; // if $_GET['id'] exists, return it as an integer, otherwise use a sentinel, id's usually start with 1, so 0 works
$query = 'SELECT * FROM contracts WHERE id='. $cid .' LIMIT 1'; // so try to use limit 1, no need to add extra steps in the database lookup
mysql_select_db('survival_contracts');
$result = mysql_query($query);
//$result = mysql_query($query) or die(mysql_error());
// now loop through the results
while($row = mysql_fetch_array($result)){
// and use'em however you wish
echo ("<div class='mso_body_wrap'>
<div id='mso_news_container'>
<div class='mso_news_wrap'>
<div class='mso_news_top'>$row[contract_type]</div>
<div class='mso_news_poster'>
<div class='mso_poster_avatar'><img src='images/tank.jpg'></div>
<div class='mso_poster_info'>for <a href='#'>$row[unit]</a><br />by: <a href='http://www.survivaloperations.net/user/$row[userid]-$row[username]/'>$row[username]</a></div>
</div>
<div class='mso_news_content'>
<div class='mso_news_body'>
Callsign: $row[callsign]<br />
Urgency: $row[urgency]<br />
Location: $row[location]<br />
Grid: $row[grid]<br />
Enemy Activity: $row[enemy_activity]<br />
Hours Since Lasrt Contact: $row[contact_hours]<br /><br />
Supplies Requested: $row[supplies]<br />
Comments: $row[comments]
</div>
</div>
<div class='mso_news_bottom'></div>
</div>
</div>");
}

Answer 2

Google for $_GET variable in PHP and have a look at database connection using PDO or mysqli
http://php.net/manual/en/mysqli.query.php
http://php.net/manual/en/pdo.query.php
After you added code:
mysql_* is deprecated. Try to switch to either mysqli or PDO and have a look at the link above.

Answer 3

$id = filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT) ? abs( (int) $_GET['id']) : 0;
if($id == 0) {
echo 'Invalid ID';
return;
} else {
$query = "SELECT * FROM `table` WHERE `id`=". $id;
$get = $db->prepare($query);
if($get) {
$get = $db->query($query);
$r = $get->fetch_array(MYSQLI_ASSOC);
var_dump($r);
} else {
echo 'Could not connect to the database';
return;
}
I've mixed two styles of MySQLi, which isn't really standard, but it should suffice for this example.
http://php.net/mysqli
(Ensure you have database connection)

Answer 4

$row2 should be $row
And things like
$row[contract_type]
Better to be
$row['contract_type']
And try to move to mysqli or PDO as advised by earlier poster