详解基于swoole的mysql连接池实现
时间:2022-03-03 11:51
swoole框架栏目介绍swoole实现mysql连接池的方法
推荐(免费):swoole框架
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
我们采用swoole实现mysql连接池
连接池类
<?php require_once "MysqlDB.php";class MysqlPool{ private static $instance; private $pool; private $config; private $pool_get_timeout; /** * 获取mysql进程池单例 * @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; $this->pool = new \Swoole\Coroutine\Channel($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
<?phpclass MysqlDB{ private $connection; public function connect($config) { $connection = new \Swoole\Coroutine\MySQL(); $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协程服务器中创建连接池
<?php require_once "MysqlPool.php";\Co\run(function () { $server = new \Co\Http\Server("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();});
源码地址 swoole-mysql-pool
相关免费学习推荐:mysql视频教程
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