How laravel uses Redis to read website cache

Redis is completely open source and free, complies with 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 data in 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 has only used this method to install. For Windows, please go to http://www.redis.net.cn/tutor or http://www.jb51.net/article/84071.htm... )

Official Ubuntu installation method

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

Since my website uses the laravel framework, I need to use the composer method to install it

composer require predis/predis

If you install the lumen microframework, 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里面加入此段代码
$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 Located in config/database.php:

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

The cluster option indicates whether to shard between multiple Redis nodes. Here we only have one node for local testing, so we set it is 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):

Parameters	Meaning	Default value
host	Server IP address/host name	127.0.0.1
port	Redis server listening port number	6379
password	If the server requires an authentication password	Do not use a password
database	The database index selected when connecting	No index is set
timeout	Timeout for connecting to the Redis server	5 seconds
read_write_timeout	Timeout for read and write operations through network connection	System default (set to -1 if the timeout is not limited)

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)){    //首先查寻cache如果找到
  $values = Cache::get($>key); //直接读取cache
  return $values;
 }else{         //如果cache里面没有  
  $values = DB::select($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 the cache has 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.

Related recommendations:

A PHP website cache code sharing

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