How to add values to cache - php

Question

I am using file cache in yii2 framework.
My question is
Is it possible to add some extra value to cache without refresh the cacheFile.Suppose i create cache file for my products now on each entry i update cache file. I want to add just the new product to cache.
How can i do that thanks in advance
This is my Code
public static function updateCache(){
$product_grid = Yii::$app->db->createCommand("CALL get_products()")->queryAll();
Yii::$app->cache->set('product_grid', $product_grid);
}
I write store procedure for getting all products,now when i add new product each time i am calling the updateCache function which regenerate the products and add it to cache due to which application speed may be effected.
This is the code for addingProduct and updateCache:
public function actionCreate($id = NULL) {
$model = new PrProducts();
if ($model->load(Yii::$app->request->post())) {
$model->save(false);
self::updateCache();
}
}

Answer 1

Native Yii2 cache components doesn't allow to update existing cache items partially.
But you can do this manually:
public static function addToCache($modelProduct) {
$productGrid = Yii::$app->cache->get('productGrid');
$productGrid[$modelProduct->id] = $modelProduct->attributes;
Yii::$app->cache->set('productGrid', $productGrid);
}
But I recommend other way: you can store each product record as separate cache item.
Firstly you can add multiple items:
public static function refreshProductCache() {
// Retrieve the all products
$products = Yii::$app->db->createCommand("CALL get_products()")->queryAll();
// Prepare for storing to cache
$productsToCache = [];
foreach ($products as $product) {
$productId = $product['id'];
$productsToCache['product_' . $productId] = $product;
}
// Store to cache (existing values will be replaced)
Yii::$app->cache->multiSet($productsToCache);
}
Secondly you can update cache when you read data. For instance:
public function actionView($id) {
$model = Yii::$app->cache->getOrSet('product_'.$id, function() use ($id) {
return PrProducts::find()
->andWhere(['id' => $id])
->one();
});
return $this->render('view', ['model' => $model]);
}
This code creates cache only one time for each $id that not yet present in the cache.
Thirdly you can add individual products to cache right after create/update. For instance:
public static function addToCache(PrProducts $modelProduct) {
$productId = $modelProduct->id;
Yii::$app->cache->set('product_' . $productId, $modelProduct);
}
I think this approach more flexible. Of course, it may be less efficient than you way. It very depends from code that reads your cache.