<"";
  public $server = [];
  public function __construct() {
    //实例化
    $this->db = new swoole_mysql();
    //配置参数
    $this->server = [
      'host' => '127.0.0.1',
      'port' => 3306,
      'user' => 'root',
      'password' => 'xxooni',
      'database' => 'lws',
      'charset' => 'utf8',
      'timeout' => 2, // 可选：连接超时时间（非查询超时时间），默认为SW_MYSQL_CONNECT_TIMEOUT（1.0）
    ];
  }
  //执行SQL语句操作
  public function execute($sql) {
    $this->db->connect($this->server, function($db, $res) use($sql) {
      echo "连接MySQL...\n";
      if($res === false) {
        var_dump($db->connect_errno, $db->connect_error);
        die;
      }
      $db->query($sql, function($db, $res){
        if($res === false) {
          var_dump($db->error, $db->errno);
        }elseif($result === true) {
          var_dump($db->affected_rows, $db->insert_id);
        }
        var_dump($res);
        $db->close();
      });
    });
    return true;
  }
}
$obj = new SwooleMysql();
$sql = 'select `article_title` from `lws_article` where `article_id`=66';
$res = $obj->execute($sql);
var_dump($res);
echo "lws\n";