分页查询处理上百万数据 更新

$count = Route::find()->where(['ro_visible'=>1])->count();//统计数据表数量
$limit = 100;
$pagecount = ceil($count/$limit); // 计算数据表的 页数

//事务执行
$tr = Yii::$app->db->beginTransaction();
try {
    for ($page = 1; $page <= $pagecount; $page++) {
        $offset = ($page - 1) * $limit;
        $routes = Route::find()->where(['ro_visible'=>1])->limit($limit)->offset($offset)->all();//分页查询
        foreach ($routes as $route) {
            $rt_name=RouteType::find()->select('rt_name')->where(['rt_id'=>$route['rt_id']])->one();
　　　　　　　　//处理分页查询出来的数据 及逻辑更新
            $route->ro_name = $route['start_region_name'].$route['child_start_region_name'].'-'.$route['stop_region_name'].$route['child_stop_region_name'].'-'.$rt_name['rt_name'];
            $route->save();
        }

    }

    $tr->commit();

    $this->message('执行成功');
} catch (\Exception $exception) {
    $tr->rollBack();
    $this->message($exception->getMessage());
}