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傳統的nginx+FPM模式的PHP程式而言,每次請求FPM的worker都會連線一次mysql,然後請求結束便會斷開連線。對於並行小的應用來說這不會有什麼問題,但是對於高並行的應用來說,頻繁建立連線Connect和銷燬連線Close,資料庫便會成為瓶頸,相信不少人也遇到過to many connection的mysql報錯吧。
連線池採用的是長連線模式,會一直保持與MySQL的連線,用完後會重新放回連線池,從而節省了建立連線和斷開連線的消耗,大大降低了系統IO的消耗,一定程度上提高了程式的並行效能。如果連線池空閒,就從連線池分配一個連線,否則,請求將被加入到等待佇列中。
我們採用swoole實現mysql連線池
<?php require_once "MysqlDB.php";class MysqlPool{ private static $instance; private $pool; private $config; private $pool_get_timeout; /** * 獲取mysql程序池單例 * @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; $this->pool = new \Swoole\Coroutine\Channel($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); } /** * 獲取連線池長度 * @return mixed */ public function getPoolSize(){ return $this->pool->length(); }}
<?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; }}
<?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();});
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