站長資訊網swoole框架欄目介紹swoole實現mysql連接池的方法
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前言
傳統的nginx+FPM模式的PHP程序而言，每次請求FPM的worker都會連接一次mysql，然后請求結束便會斷開連接。對于并發小的應用來說這不會有什么問題，但是對于高并發的應用來說，頻繁建立連接Connect和銷毀連接Close，數據庫便會成為瓶頸，相信不少人也遇到過to many connection的mysql報錯吧。
連接池的優勢
連接池采用的是長連接模式，會一直保持與MySQL的連接，用完后會重新放回連接池，從而節省了建立連接和斷開連接的消耗，大大降低了系統IO的消耗，一定程度上提高了程序的并發性能。如果連接池空閑，就從連接池分配一個連接，否則，請求將被加入到等待隊列中。
實現
我們采用swoole實現mysql連接池
連接池類
<?php require_once "MysqlDB.php";class MysqlPool{ private static $instance; private $pool; private $config; private $pool_get_timeout; /** * 獲取mysql進程池單例 * @param null $config * @return MysqlPool */ public static function getInstance($config = null) { if (empty(self::$instance)) { if (empty($config)) { throw new RuntimeException("mysql config is empty"); } self::$instance = new static($config); } return self::$instance; } public function __construct($config) { if (empty($this->pool)) { $this->config = $config; $this->pool = new SwooleCoroutineChannel($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); } /** * 獲取連接池長度 * @return mixed */ public function getPoolSize(){ return $this->pool->length(); }}
數據庫DB類
<?phpclass MysqlDB{ private $connection; public function connect($config) { $connection = new SwooleCoroutineMySQL(); $res = $connection->connect($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協程服務器中創建連接池
<?php require_once "MysqlPool.php";Corun(function () { $server = new CoHttpServer("0.0.0.0", 9501, false); $pool = MysqlPool::getInstance([ 'pool_size'=>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("<h1>Test</h1>"); }); $server->handle('/test', function ($request, $response) { $response->end("<h1>Test</h1>"); }); $server->handle('/stop', function ($request, $response) use ($server) { $response->end("<h1>Stop</h1>"); $server->shutdown(); }); $server->start();});
源碼地址 swoole-mysql-pool
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