Display only queried ID+row PHP/MySQL - php

Question

I have my data stored in a MySQL table, which includes an auto_increment ID number (unique) for each new row.
I'd like users to be able to get a certain ID number, using the $_GET function.
eg. User loads http://mysite.com/id.php?id=123
Page displays ID number 123 along with the row.
echo $row['id'];
echo "<table>";
echo "<tr> <th>Unit</th> <th>Message</th> <th>Date</th> </tr>";
while($row = mysql_fetch_array( $result )) {
echo "<tr><td>";
echo $row['title'];
echo "</td><td>";
echo $row['description'];
echo "</td><td>";
echo $row['pubDate'];
echo "</td></tr>";
}
echo "</table>";
echo "</center>";
I'm stuck as to where I put the $_GET bit.
Thanks :)

Answer 1

You should append it to your query (using intval to avoid SQL injection) like this:
// use the id in your WHERE clause, convert it to an integer to avoid sql injections
$query = 'SELECT fields FROM table WHERE id = ' . intval($_GET['id']);
$result = mysql_query($query);
$row = mysql_fetch_row($result);
... do stuff with $row ...

Answer 2

Firstly, your code does not make much sense, since you use $row before it was defined.
Secondly, $result isn't defined at all, and it should be, for example like this:
$id = intval($_GET['id']);
$result = mysql_query("SELECT FROM table WHERE id = '$id'");
And now you know how and where to use $_GET['id'].

Answer 3

Dont waste your time doing the comparison afterwards, you'll save yourself alot of time by adding it to the original query
$id = intval($_GET['id']);
$query = "SELECT whatever FROM table WHERE id=$id";

Answer 4

$id = $_GET['id'];
$id = mysql_real_escape_string($id);
$query = "SELECT * FROM `Table` WHERE `id`='" . $id . "'";
$res = mysql_query ($query);
$exist = mysql_num_rows($res);
if ($exist) {
$row = mysqlfetch_assoc($res);
...
}