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$this->db->query("INSERT INTO " . DB_PREFIX . "tax_class SET title = '" . $this->db->escape($data['title']) . "', description = '" . $this->db->escape($data['description']) . "', date_added = NOW()");

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

if (isset($data['tax_rule'])) {
	foreach ($data['tax_rule'] as $tax_rule) {
		$this->db->query("INSERT INTO " . DB_PREFIX . "tax_rule SET tax_class_id = '" . (int)$tax_class_id . "', tax_rate_id = '" . (int)$tax_rule['tax_rate_id'] . "', based = '" . $this->db->escape($tax_rule['based']) . "', priority = '" . (int)$tax_rule['priority'] . "'");
	}
}

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

$this->db->query("UPDATE " . DB_PREFIX . "tax_class SET title = '" . $this->db->escape($data['title']) . "', description = '" . $this->db->escape($data['description']) . "', date_modified = NOW() WHERE tax_class_id = '" . (int)$tax_class_id . "'");

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

if (isset($data['tax_rule'])) {
	foreach ($data['tax_rule'] as $tax_rule) {
		$this->db->query("INSERT INTO " . DB_PREFIX . "tax_rule SET tax_class_id = '" . (int)$tax_class_id . "', tax_rate_id = '" . (int)$tax_rule['tax_rate_id'] . "', based = '" . $this->db->escape($tax_rule['based']) . "', priority = '" . (int)$tax_rule['priority'] . "'");
	}
}

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

$this->db->query("DELETE FROM " . DB_PREFIX . "tax_class WHERE tax_class_id = '" . (int)$tax_class_id . "'");
$this->db->query("DELETE FROM " . DB_PREFIX . "tax_rule WHERE tax_class_id = '" . (int)$tax_class_id . "'");

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

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

return $query->row;

if ($data) {
	$sql = "SELECT * FROM " . DB_PREFIX . "tax_class";

	$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 {
	$tax_class_data = $this->cache->get('tax_class');

	if (!$tax_class_data) {
		$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "tax_class");

		$tax_class_data = $query->rows;

		$this->cache->set('tax_class', $tax_class_data);
	}

	return $tax_class_data;			
}

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

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

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

return $query->rows;

$query = $this->db->query("SELECT COUNT(DISTINCT tax_class_id) AS total FROM " . DB_PREFIX . "tax_rule WHERE tax_rate_id = '" . (int)$tax_rate_id . "'");

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