Comparison between original code, and ORM code

orm-comparison.php

<?php

// Without ORM
$forum_id = 0;
$query = "select id from imas_forums where courseid = ".$_GET['courseid'];
$result = mysql_query($query) or die("Query failed: ".mysql_error());
$foro = mysql_fetch_row($result);
if(count($foro)>0)
    $forum_id = $foro[0];

// With ORM
$forum = ORM::for_table('imas_forums')->where('courseid',$_GET['courseid'])->find_one();
$forum_id = $forum ? $forum->id : 0;