This article mainly introduces to you the relevant information about laravel using Redis to implement website cache reading. The article introduces it in detail through sample code. It has certain reference learning value for everyone's study or work. Friends who need it Come and learn together.

Introduction to redis

Redis is completely open source and free, abides by the BSD protocol, and is a high-performance key-value database . Redis and other key-value
caching products have the following three characteristics: Redis supports data persistence, which can keep the data in the memory on the disk and can be loaded again for use when restarting.

Redis not only supports simple key-value type data, but also provides storage of data structures such as list, set, zset, and hash.

Redis supports data backup, that is, data backup in master-slave mode.

Redis Advantages

• Extremely high performance – Redis can read at a speed of 110,000 times/s. The writing speed is 81000 times/s.

• Rich data types – Redis supports Strings, Lists, Hashes, Sets and Ordered Sets data type operations for binary cases.

• Atomic - All operations of Redis are atomic, and Redis also supports atomic execution of several operations after they are fully merged.

• Rich features – Redis also supports publish/subscribe, notifications, key expiration and other features.

How to install redis

1.Ubuntu (because I am using the Homestead environment virtual machine is Ubuntu, so I have only used this method to install)

Official Ubuntu installation method

$sudo apt-get update
$sudo apt-get install redis-server

Because of my website The laravel framework used needs to be installed using the composer method

composer require predis/predis

If you install the lumen micro-framework, you also need to install illuminate/redis (5.2.*)

composer require illuminate/redis (5.2.*)

Configuration

If lumen is installed

//需要在bootstrap/app.php里面加入此段代碼
$app->register(Illuminate\Redis\RedisServiceProvider::class);
$app->configure('database');

Redis can be used as the main database, so the configuration information of Redis in Laravel is located in config/database.php:

'redis' => [
'cluster' => false,
'default' => [
 'host' => '127.0.0.1',
 'port' => 6379,
 'database' => 0,
],
],

The cluster option indicates whether to perform sharding among multiple Redis nodes. Here we only test one node locally, so we set it to false.

The default option indicates the default Redis host connection. Here Redis and the Web server share a host, so the host is 127.0.0.1 and the Redis default port is 6379.

In addition, the default option also supports more connection parameters (if needed):

read_write_timeout |Timeout for read and write operations through network connection|System default (set to -1 if the timeout is not limited)

In addition, if Redis is used as a caching tool, you also need to configure the redis option in config/cache.php:

'redis' => [

'driver' => 'redis',
'connection' => 'default',
],

The connection here corresponds to the default redis in config/database Host default configuration.

After completing the above configuration, we can use Redis for data access in the application code.

Look at an example——Laravel’s mysql is paired with Redis

My idea is that when reading First go to the cache to search. If you find it, you will be lucky. If you can't find it, go to the database to search and transfer it to the cache.

 if (Cache::has($key)){    //首先查尋cache如果找到
  $values = Cache::get($>key); //直接讀取cache
  return $values;
 }else{         //如果cache里面沒有  
  $values = DB::select($sql);
  Cache::put($key,$value,$time);
  return $values;
 }

But laravel’s cache also provides a remember function

 $values = Cache::remember($key,$time,function () {
   return DB::select($this->sql);
  });

If cached There is direct reading and return. If the cache item does not exist in the cache, the closure returned to the remember method will be run, and the result of the closure will be stored in the cache.

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