基于swoole协程的mysql连接池基于swoole协程的mysql连接池

前言传统的nginx+FPM模式的PHP程序而言，每次请求FPM的worker都会连接一次mysql，然后请求结束便会断开连接。对于并发小的应用来说这不会有什么问题，但是对于高并发的应用来说，频繁建立连接Connect和销毁连接Close，数据库便会成为瓶颈，相信不少人也遇到过to many connection的mysql报错吧。
连接池的优势连接池采用的是长连接模式，会一直保持与MySQL的连接，用完后会重新放回连接池，从而节省了建立连接和断开连接的消耗，大大降低了系统IO的消耗，一定程度上提高了程序的并发性能。如果连接池空闲，就从连接池分配一个连接，否则，请求将被加入到等待队列中。
实现 【基于swoole协程的mysql连接池】我们采用swoole实现mysql连接池
连接池类

pool)) { $this->config = $config; $this->pool = new \Swoole\Coroutine\Channel($config['pool_size']); for ($i = 0; $i < $config['pool_size']; $i++) { \go(function() use ($config) { $mysql = new MysqlDB(); $res = $mysql->connect($config['mysql']); if ($res === false) { throw new RuntimeException("Failed to connect mysql server"); } else { $this->pool->push($mysql); } }); } } }public function get() { if ($this->pool->length() > 0) { $mysql = $this->pool->pop($this->config['pool_get_timeout']); if (false === $mysql) { throw new RuntimeException("Pop mysql timeout"); } return $mysql; } else { throw new RuntimeException("Pool length <= 0"); } }public function recycle(MysqlDB $mysql){ $this->pool->push($mysql); }/** * 获取连接池长度 * @return mixed */ public function getPoolSize(){ return $this->pool->length(); } }

数据库DB类

connect($config); if ($res === false) { throw new RuntimeException($connection->connect_error, $connection->errno); } else { $this->connection = $connection; } return $res; }public function query($sql){ $result = $this->connection->query($sql); return $result; } }

在HTTP协程服务器中创建连接池

5, 'pool_get_timeout'=>1, 'timeout'=>1, 'charset'=>'utf8', 'strict_type'=>false, 'fetch_mode'=>true, 'mysql'=>[ 'host'=>'127.0.0.1', 'port'=>'3306', 'user'=>'homestead', 'password'=>'secret', 'database'=>'blog', ] ]); $server->handle('/', function ($request, $response) use ($pool){ $mysql = $pool->get(); $res = $mysql->query("select id,phone,username from user limit 1"); var_dump($res); $pool->recycle($mysql); $response->end("Test"); }); $server->handle('/test', function ($request, $response) { $response->end("Test"); }); $server->handle('/stop', function ($request, $response) use ($server) { $response->end("Stop"); $server->shutdown(); }); $server->start(); });

源码地址 laravel-model