用swoole实现mysql的连接池--摘自https://github.com/153734009/doc/blob/master/php/mysql_pool.php
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| <?php | |
| $serv = new swoole_server("0.0.0.0", 9508); | |
| $serv->set([‘worker_num‘=>1, ‘task_worker_num‘=>5]); | |
| function onReceive($serv, $fd, $from_id, $data) | |
| { | |
| $sql = $data; | |
| $result = $serv->taskwait($sql); | |
| if($result !== false){ | |
| $serv->send($fd, $result . "\n"); | |
| }else{ | |
| $serv->send($fd, "Err:Task timeout\n"); | |
| } | |
| //异步的时候就麻烦了，需要把$fd传递到onFinish，才能send数据到 | |
| //$serv->task($sql); | |
| } | |
| /** | |
| * task保持数据库连接 | |
| * 使用静态变量，因为变量没有释放，所以才能保持连接 | |
| * mysql连接的数量= task_worker_num | |
| */ | |
| function onTask($serv, $fd, $from_id, $sql) | |
| { | |
| static $conn = null; | |
| if($conn == null){ | |
| $conn = mysqli_connect(‘127.0.0.1‘, ‘root‘, ‘123456‘, ‘help‘); | |
| if(!$conn){ | |
| $conn = null; | |
| $serv->finish(‘ERR:‘.mysqli_connect_error()); | |
| return; | |
| } | |
| } | |
| $result = $conn->query($sql); | |
| if(!$result){ | |
| $serv->finish(‘ERR:‘.mysqli_error($conn)); | |
| return; | |
| } | |
| $data = $result->fetch_all(MYSQLI_ASSOC); | |
| $serv->finish(‘OK:‘.serialize($data)); | |
| } | |
| function onFinish($serv, $task_id, $data) | |
| { | |
| // 异步Task时有效 | |
| echo "AsyncTask Finish:Connect.PID=".posix_getpid().PHP_EOL; | |
| } | |
| $serv->on(‘Receive‘, ‘onReceive‘); | |
| $serv->on(‘Task‘, ‘onTask‘); | |
| $serv->on(‘Finish‘, ‘onFinish‘); | |
| $serv->start(); | |
| //以下是客户端代码 | |
| //$client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_SYNC); //同步阻塞 | |
| //$client->connect(‘172.18.107.194‘, 9508, 0.5, 0); | |
| //$client->send("show tables"); | |
| //$data = $client->recv(); | |
| /** | |
| * 查看mysql连接 | |
| * | |
| * 1. mysql -uroot -p123456 | |
| * 2. show status; | |
| * 其中的 | |
| * Threads_connected | 1 | |
| * 就是mysql连接数 | |
| */ |
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