Yesterday I changed my database schema, and consequently a database query in my application, since then I have been receiving 500 Internal Server Errors. I do not think that the problem is the query, as I can run it from my model, and print the array from my controller. The problem seems to be when building the template.
Below is my code,
MODEL
public function searchCandidates($type=null, $gender=null, $age=null)
{
if($age != "0") {
$age = implode(", %",$age);
}
$sql = 'SELECT `candidates`.`candidate_id`,
`candidates`.`first_name`,
`candidates`.`surname`,
`candidates`.`DOB`,
`candidates`.`gender`,
`candidates`.`talent`,
`candidates`.`location`,
`candidates`.`availability`,
`candidates`.`youtube_showreel_1`,
`candidates`.`youtube_showreel_2`,
`candidates`.`youtube_showreel_3`,
`candidates`.`youtube_showreel_4`,
`candidates`.`youtube_showreel_5`,
`candidates`.`youtube_showreel_desc_1`,
`candidates`.`youtube_showreel_desc_2`,
`candidates`.`youtube_showreel_desc_3`,
`candidates`.`youtube_showreel_desc_4`,
`candidates`.`youtube_showreel_desc_5`,
`candidates`.`date_created`,
DATE_FORMAT(NOW(), "%Y") - DATE_FORMAT(`candidates`.`DOB`, "%Y") - (DATE_FORMAT(NOW(), "00-%m-%d") < DATE_FORMAT(`candidates`.`DOB`, "00-%m-%d")) as `age`,
`candidate_assets`.`url`,
`candidate_assets`.`asset_size`
FROM `candidates`
LEFT JOIN `candidate_assets` ON `candidate_assets`.`candidates_candidate_id` = `candidates`.`candidate_id`
WHERE `candidates`.`availability` = "yes"';
//is there a certain criteria
if($type != "0") { $sql .= 'AND `candidates`.`talent` = '.$type; }
if($age != "0") { $sql .= 'AND `candidates`.`playing_age` LIKE "%'.$age.'%"';}
if($gender != false){ $sql .= 'AND `candidates`.`gender` = '.$gender; }
$sql .= ' GROUP BY `candidates`.`candidate_id`';
$query = $this->db->query($sql);
//die(print_r($query->result_array()));
//die($this->db->last_query());
return $query->result_array();
}
CONTROLLER
$data['results'] =
$this->candidates_model->searchCandidates($this->input->post('type'), $this->input->post('gender'), $this->input->post('age'));
$this->session->set_userdata('search', $data['results']);
//die(print_r($this->session->userdata('search')));
$this->template->build('search/results', $data);
The error in my error logs looks like this,
[Fri Dec 09 10:28:49 2011] [error] [client xx.xx.xx.xxx] malformed
header from
script. Bad header=Bs%3A2%3A%2259%22%3Bs%3A10%3A%: index.php, referer: http://urbantalent.factoryagency.co.uk/search
My best guess is that you are trying to put too many things into the ci_session cookie.
Some of the values there might not be encoded properly and don’t look like a valid header. set-cookie HTTP header will then be wrong hence you get the “malformed header” error.
Start by limiting WHAT goes into this cookie. Perhaps disable/don’t use it at all if you can (temporarily while you debug your code)
Then fix the dynamic SQL – you need space in front of each “AND”
.gender should probably also be wrapped in double quotes.
EDIT:
Yes, now I am even more convinced.
sico87 – This is live from your site (see below – sorry for a very long string).
The size of this cookie is close to 8K. There are certain limits on the size of HTTP headers. And from memory for Apache it is 8K.
So my best guess (yes, guess!) is that under certain circumstances you put more than 8K in the cookie and this request fails. The solution is to not use cookies to store/transfer large volumes of data.