异步Mysql客户端

AsyncMysql::query($sql, $usePool = true)

第二个参数设为false将不会使用连接池中的资源，默认都会从连接池中取，配置连接池数量 => config/database.php

具体使用

    use AsyncMysql;
    //设置超时时间
    AsyncMysql::setTimeout(2);
    $res = (yield AsyncMysql::query("INSERT INTO `user` (`id`, `mobile`, `password`) 
    VALUES (NULL, '18768122222', '11111')"));
    //失败返回false   
    if ($res) {
        $result = $res->getResult();
        $affectedRows = $res->getAffectedRows();
        $id = $res->getInsertId();
    }

异步Mysql事务处理

与传统事务一样使用，只是需要加上yield关键词，以异步方式调用

    use AsyncMysql;
    public function test()
    {
        try {
            yield AsyncMysql::begin();
            $res = (yield $this->doTrans());
            if ($res === false) {
                throw new \Exception("need roll back");
            }
            yield AsyncMysql::commit();
        } catch (\Exception $e) {
            yield AsyncMysql::rollback();
        }
    }
    public function doTrans()
    {
        $res = (yield AsyncMysql::query("INSERT INTO `user` (`id`, `mobile`, `password`) 
        VALUES (NULL, '187681343332', '11111')"));
        if ($res) {
            $result = $res->getResult();
            $affectedRows = $res->getAffectedRows();
            $id = $res->getInsertId();
            $res = (yield AsyncMysql::query("SELECT * FROM `user` WHERE id = {$id}"));
            $res = (yield AsyncMysql::query("SELECT * FROM `user`"));
            $res = (yield AsyncMysql::query("DELETE FROM `user` WHERE id = {$id}", false));
        }
        yield true;
    }