nstance_name + "</option>";
                            if (supportDb.indexOf(i.db_type) !== -1) {
                                $("#optgroup-" + i.db_type).append(instance);
                            }
                        }
                        $('#instance_name').selectpicker('render').selectpicker('refresh');
                        $("#db_name").empty().selectpicker('render').selectpicker('refresh');
                    } else {
                        alert(data.msg);
                    }
 