laravel query cache

Laravel is a popular PHP web framework that is widely used in web development. Its query builder allows you to build database queries, repository schemas and styles in an elegant way. However, Laravel ORM's queries can sometimes be very slow, which can impact the performance of your application. One way to solve this problem is to use Laravel's query cache. In this article, we will introduce the concept of Laravel query cache and how to use it in Laravel.

What is query cache?

Query cache is a caching technology that can be used to reduce the execution time of SQL queries. In the query cache, the first time a query is run, the results are cached so that when the query is repeatedly executed later, the results can be obtained directly from the cache without re-executing the query. This can significantly reduce query execution time, thereby improving application performance.

In Laravel, the query cache uses a cache driver to store query results. You can choose any cache driver like memcached, Redis or file cache etc. Laravel also provides a simple API that allows you to use cache drivers easily.

Laravel query cache syntax

In Laravel, query cache can be implemented using the cache() method. The following is the basic syntax for using query cache:

$users = DB::table('users')

->where('name', 'John') ->cache(10) // 缓存10分钟 ->get();

In the above example, we first use the DB::table() method to specify the database table to be queried. Then we use the where() method to add constraints, and finally the get() method to execute the query. At the same time, we use the cache() method to enable query caching, which accepts a time parameter to specify the cache time.

How to configure the query cache

Before using the query cache, you need to configure the cache driver first. Laravel supports a variety of cache drivers, including file cache, memcached cache, Redis cache, etc. You can choose the appropriate cache driver based on your needs. In this article, we will use file caching to demonstrate.

To configure file caching, open the config/cache.php file and you will see the following:

return [

/* |-------------------------------------------------------------------------- | Default Cache Store |-------------------------------------------------------------------------- | | This option controls the default cache "store" that gets used while | using this caching library. This connection is used when another is | not explicitly specified when executing a given caching function. | | Supported: "apc", "array", "database", "file", "memcached", "redis", "dynamodb" | */ 'default' => env('CACHE_DRIVER', 'file'), /* |-------------------------------------------------------------------------- | Cache Stores |-------------------------------------------------------------------------- | | Here you may define all of the cache "stores" for your application as | well as their drivers. You may even define multiple stores for the | same driver to group types of items stored in your caches. | */ 'stores' => [ 'apc' => [ 'driver' => 'apc', ], 'array' => [ 'driver' => 'array', ], 'database' => [ 'driver' => 'database', 'table' => 'cache', 'connection' => null, ], 'file' => [ 'driver' => 'file', 'path' => storage_path('framework/cache/data'), ], 'memcached' => [ 'driver' => 'memcached', 'persistent_id' => env('MEMCACHED_PERSISTENT_ID'), 'sasl' => [ env('MEMCACHED_USERNAME'), env('MEMCACHED_PASSWORD'), ], 'options' => [ // Memcached::OPT_CONNECT_TIMEOUT => 2000, ], 'servers' => [ [ 'host' => env('MEMCACHED_HOST', '127.0.0.1'), 'port' => env('MEMCACHED_PORT', 11211), 'weight' => env('MEMCACHED_WEIGHT', 100), ], ], ], 'redis' => [ 'driver' => 'redis', 'connection' => 'cache', ], ], /* |-------------------------------------------------------------------------- | Cache Key Prefix |-------------------------------------------------------------------------- | | When utilizing a RAM based store such as APC or Memcached, there might | be other applications utilizing the same cache. So, we'll specify a | value to get prefixed to all our keys so we can avoid collisions. | */ 'prefix' => env('CACHE_PREFIX', Str::slug(env('APP_NAME', 'laravel'), '_').'_cache'),

];

In the configuration file above, you can see the section 'Laravel supports multiple cache drivers. The 'file' driver uses the file system to store the cache. You can change the value of the path' option to specify the directory where you want the cache to be stored. By default, all caches are stored in the storage/framework/cache/data directory.

Notes after using query cache

There are several things to pay attention to when using query cache. First, the query cache is only useful for queries that return results after executing the query. If you are executing queries that modify the database, such as INSERT, UPDATE, and DELETE queries, the query cache will not work. Second, the query cache is only useful for regular queries. Query caching will not work if your query contains random elements such as timestamps or GUIDs. Finally, query caching should only be used when query results rarely change. If your query results change frequently, using the query cache may result in incorrect results.

Conclusion

Laravel query cache is a powerful tool for reducing SQL query execution time. Performance issues are always a concern when developing large-scale web applications. By using the Laravel query cache, you can significantly improve the performance of your application and provide faster response times. When implementing query caching, please pay attention to the points and considerations we mentioned and choose the appropriate cache driver according to your needs.

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