講解swoole HTTP伺服器中異步MySQL

還是直接上程式碼：

<?php$http = new swoole_http_server("0.0.0.0", 9501);$http->on(&#39;request&#39;, function($request, $response){
    $swoole_mysql1 = new Swoole\Coroutine\MySQL();    $swoole_mysql2 = new Swoole\Coroutine\MySQL();    $swoole_mysql1->connect([        &#39;host&#39; => &#39;127.0.0.1&#39;,        &#39;port&#39; => 3306,        &#39;user&#39; => &#39;root&#39;,        &#39;password&#39; => &#39;root&#39;,        &#39;database&#39; => &#39;swoole&#39;,
    ]);    $swoole_mysql2->connect([        &#39;host&#39; => &#39;127.0.0.1&#39;,        &#39;port&#39; => 3306,        &#39;user&#39; => &#39;root&#39;,        &#39;password&#39; => &#39;root&#39;,        &#39;database&#39; => &#39;swoole&#39;,
    ]);    $res1 = $swoole_mysql1->query(&#39;SELECT * FROM data1&#39;);    $res2 = $swoole_mysql2->query(&#39;SELECT * FROM data2&#39;);    $response->header("Content-Type", "text/html; charset=utf-8");    $response->end("<h1>Hello Swoole. #".count($res1).count($res2)."</h1>");

});$http->start();

推薦（免費）：swoole

使用瀏覽器訪問。 http://ip:9501
非同步MySQL可以不需要等待第一條查詢完成後再執行第二條，在存取不同伺服器，不同資料庫，不同的表時效果比較明顯。
比較同步MySQL查詢程式碼：

<?php$http = new swoole_http_server("0.0.0.0", 9501);$http->on(&#39;request&#39;, function($request, $response){    $swoole_mysql1 = mysqli_connect(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;root&#39;, &#39;swoole&#39;, 3306);    $swoole_mysql2 = mysqli_connect(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;root&#39;, &#39;swoole&#39;, 3306);    $res1 = $swoole_mysql1->query(&#39;SELECT * FROM data1&#39;);    $res2 = $swoole_mysql2->query(&#39;SELECT * FROM data2&#39;);    $response->header("Content-Type", "text/html; charset=utf-8");    $response->end("<h1>Hello Swoole. #".$res1->num_rows.$res2->num_rows."</h1>");

});$http->start();

同步程式碼使用PHP原生方式查詢資料。
放上兩種查詢方式的使用ab進行的效能測試：
ab -c 100 -n 1000 http://127.0.0.1:9501/
非同步查詢：

Server Software:        swoole-http-server
Server Hostname:        127.0.0.1Server Port:            9501Document Path:          /
Document Length:        30 bytesConcurrency Level:      100Time taken for tests:   1.477 secondsComplete requests:      1000Failed requests:        0Write errors:           0Total transferred:      193000 bytesHTML transferred:       30000 bytesRequests per second:    676.82 [#/sec] (mean)Time per request:       147.749 [ms] (mean)
Time per request:       1.477 [ms] (mean, across all concurrent requests)
Transfer rate:          127.57 [Kbytes/sec] received

Connection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    1   1.8      0       7Processing:     4  140  24.0    145     156Waiting:        0  140  24.1    145     156Total:          7  140  22.6    145     160Percentage of the requests served within a certain time (ms)  50%    145
  66%    146
  75%    148
  80%    148
  90%    150
  95%    152
  98%    153
  99%    154
 100%    160 (longest request)

同步查詢：

Server Software:        swoole-http-server
Server Hostname:        127.0.0.1Server Port:            9501Document Path:          /
Document Length:        30 bytesConcurrency Level:      100Time taken for tests:   2.765 secondsComplete requests:      1000Failed requests:        0Write errors:           0Total transferred:      193000 bytesHTML transferred:       30000 bytesRequests per second:    361.67 [#/sec] (mean)Time per request:       276.493 [ms] (mean)
Time per request:       2.765 [ms] (mean, across all concurrent requests)
Transfer rate:          68.17 [Kbytes/sec] received

Connection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   0.4      0       2Processing:     4  262  48.5    272     295Waiting:        4  262  48.5    272     295Total:          6  262  48.2    272     295Percentage of the requests served within a certain time (ms)  50%    272
  66%    278
  75%    281
  80%    284
  90%    287
  95%    291
  98%    293
  99%    294
 100%    295 (longest request)

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