public function insert($table, array $bind)
    {
        $this->_connect();
        $newbind = array();
        if (is_array($bind)) {
            foreach ($bind as $name => $value) {
                if($value !== null) {
                    $newbind[$name] = $value;
                }
            }
        }

        return parent::insert($table, $newbind);
    }