yii2 - 如何在 yii2 中刷新数据库查询缓存？

Question

当特定表记录发生一些变化时如何处理？

public static function getAirportWithCache($iata_code){

              $result = Airports::getDb()->cache(function ($db) use ($iata_code){
                     $res = Airports::find()
                               ->where(['iata_code' => $iata_code])
                               ->limit(1)
                               ->asArray()
                               ->one();
                     return $res;
              });
              return $result;
        }

Answer 1

对于全局缓存，可以使用：

Yii::$app->cache->flush();

具体来说，您可以使用 TagDependency ：

 //way to use
return Yii::$app->db->cache(function(){
    $query =  new Query();
    return $query->all();
}, 0, new TagDependency(['tags'=>'cache_table_1']));

//way to flush when modify table
TagDependency::invalidate(Yii::$app->cache, 'cache_table_1');

查看文档http://www.yiiframework.com/doc-2.0/yii-caching-tagdependency.html

Answer 2

您应该简单地使用\yii\caching\DbDependency，例如：

public static function getAirportWithCache($iata_code){
    // for example if airports count change, this will update your cache
    $dependency = new \yii\caching\DbDependency(['sql' => 'SELECT COUNT(*) FROM ' . Airports::tableName()]);
    $result = Airports::getDb()->cache(function ($db) use ($iata_code){
        return Airports::find()
            ->where(['iata_code' => $iata_code])
            ->limit(1)
            ->asArray()
            ->one();
    }, 0, $dependency);
    return $result;
}

阅读更多...

Answer 3

只需在Yii::$app->cache->flush();任何地方执行（可能在您的控制器中）

PS：它将删除存储在您服务器中的整个缓存