problem in finding second maximum value

[eluser]Bigil Michael[/eluser]
but it shows error

A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: controllers/election_result.php

Line Number: 42

A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: controllers/election_result.php

Line Number: 43

in the model we use

if($query->num_rows() > 0)
{
$row = $query->row();

// display results
echo '<pre>';
print_r($query->row());
echo '</pre>';
}

but it willnot print anything