SLT::cleanDBonPurge PHP Method

    function cleanDBonPurge()
    {
        global $DB;
        // Clean sla_levels
        $query = "SELECT `id`\n                FROM `glpi_slalevels`\n                WHERE `slts_id` = '" . $this->fields['id'] . "'";
        if ($result = $DB->query($query)) {
            if ($DB->numrows($result) > 0) {
                $slalevel = new SlaLevel();
                while ($data = $DB->fetch_assoc($result)) {
                    $slalevel->delete($data);
                }
            }
        }
        // Update tickets : clean SLT
        list($dateField, $sltField) = self::getSltFieldNames($this->fields['type']);
        $query = "SELECT `id`\n                FROM `glpi_tickets`\n                WHERE `{$sltField}` = '" . $this->fields['id'] . "'";
        if ($result = $DB->query($query)) {
            if ($DB->numrows($result) > 0) {
                $ticket = new Ticket();
                while ($data = $DB->fetch_assoc($result)) {
                    $ticket->deleteSLT($data['id'], $this->fields['type']);
                }
            }
        }
        Rule::cleanForItemAction($this);
    }