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$this->db->query("INSERT INTO " . DB_PREFIX . "weight_class SET value = '" . (float)$data['value'] . "'");

$weight_class_id = $this->db->getLastId();

foreach ($data['weight_class_description'] as $language_id => $value) {
	$this->db->query("INSERT INTO " . DB_PREFIX . "weight_class_description SET weight_class_id = '" . (int)$weight_class_id . "', language_id = '" . (int)$language_id . "', title = '" . $this->db->escape($value['title']) . "', unit = '" . $this->db->escape($value['unit']) . "'");
}

$this->cache->delete('weight_class');

$this->db->query("UPDATE " . DB_PREFIX . "weight_class SET value = '" . (float)$data['value'] . "' WHERE weight_class_id = '" . (int)$weight_class_id . "'");

$this->db->query("DELETE FROM " . DB_PREFIX . "weight_class_description WHERE weight_class_id = '" . (int)$weight_class_id . "'");

foreach ($data['weight_class_description'] as $language_id => $value) {
	$this->db->query("INSERT INTO " . DB_PREFIX . "weight_class_description SET weight_class_id = '" . (int)$weight_class_id . "', language_id = '" . (int)$language_id . "', title = '" . $this->db->escape($value['title']) . "', unit = '" . $this->db->escape($value['unit']) . "'");
}

$this->cache->delete('weight_class');	

$this->db->query("DELETE FROM " . DB_PREFIX . "weight_class WHERE weight_class_id = '" . (int)$weight_class_id . "'");
$this->db->query("DELETE FROM " . DB_PREFIX . "weight_class_description WHERE weight_class_id = '" . (int)$weight_class_id . "'");	

$this->cache->delete('weight_class');

if ($data) {
	$sql = "SELECT * FROM " . DB_PREFIX . "weight_class wc LEFT JOIN " . DB_PREFIX . "weight_class_description wcd ON (wc.weight_class_id = wcd.weight_class_id) WHERE wcd.language_id = '" . (int)$this->config->get('config_language_id') . "'";

	$sort_data = array(
		'title',
		'unit',
		'value'
	);	

	if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
		$sql .= " ORDER BY " . $data['sort'];	
	} else {
		$sql .= " ORDER BY title";	
	}

	if (isset($data['order']) && ($data['order'] == 'DESC')) {
		$sql .= " DESC";
	} else {
		$sql .= " ASC";
	}

	if (isset($data['start']) || isset($data['limit'])) {
		if ($data['start'] < 0) {
			$data['start'] = 0;
		}					

		if ($data['limit'] < 1) {
			$data['limit'] = 20;
		}	

		$sql .= " LIMIT " . (int)$data['start'] . "," . (int)$data['limit'];
	}	

	$query = $this->db->query($sql);

	return $query->rows;			
} else {
	$weight_class_data = $this->cache->get('weight_class.' . (int)$this->config->get('config_language_id'));

	if (!$weight_class_data) {
		$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "weight_class wc LEFT JOIN " . DB_PREFIX . "weight_class_description wcd ON (wc.weight_class_id = wcd.weight_class_id) WHERE wcd.language_id = '" . (int)$this->config->get('config_language_id') . "'");

		$weight_class_data = $query->rows;

		$this->cache->set('weight_class.' . (int)$this->config->get('config_language_id'), $weight_class_data);
	}

	return $weight_class_data;
}

$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "weight_class wc LEFT JOIN " . DB_PREFIX . "weight_class_description wcd ON (wc.weight_class_id = wcd.weight_class_id) WHERE wc.weight_class_id = '" . (int)$weight_class_id . "' AND wcd.language_id = '" . (int)$this->config->get('config_language_id') . "'");

return $query->row;

$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "weight_class_description WHERE unit = '" . $this->db->escape($unit) . "' AND language_id = '" . (int)$this->config->get('config_language_id') . "'");

return $query->row;

$weight_class_data = array();

$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "weight_class_description WHERE weight_class_id = '" . (int)$weight_class_id . "'");

foreach ($query->rows as $result) {
	$weight_class_data[$result['language_id']] = array(
		'title' => $result['title'],
		'unit'  => $result['unit']
	);
}

return $weight_class_data;

$query = $this->db->query("SELECT COUNT(*) AS total FROM " . DB_PREFIX . "weight_class");

return $query->row['total'];