What did you do? If possible, provide a simple script for reproducing the error.
```
//db_connection_pool.php
```

<?php declare(strict_types=1); include (dirname(DIR).'/config/db_config.php');

use Swoole\Coroutine\PostgreSQL; use Swoole\Database\PDOConfig; use Swoole\Database\PDOPool; use Swoole\Runtime;

function create_db_connection_pool() {
        return new PDOPool(
                (new PDOConfig())
                    ->withDriver('pgsql')
                    ->withHost(POSTGRES_SERVER_HOST)
                    ->withPort(POSTGRES_SERVER_PORT)
                    // ->withUnixSocket('/tmp/mysql.sock')
                    ->withDbName(POSTGRES_SERVER_DB)
                    //->withCharset('')
                    ->withUsername(POSTGRES_SERVER_USER)
                    ->withPassword(POSTGRES_SERVER_PWD)
            );
}

where constants are defined in db_config.php as:

const POSTGRES_SERVER_HOST = 'localhost'; const POSTGRES_SERVER_PORT = 5432; const POSTGRES_SERVER_DB = 'swooledb'; const POSTGRES_SERVER_USER = 'postgres'; const POSTGRES_SERVER_PWD = 'passwd123';

From inside my Main Class:

   protected $httpService;
   protected $conn_pool_swoole;

   function __construct($ip, $port, $serverMode) {
   $this->httpService = new Server($ip, $port, $serverMode); 

   $this->setDefault();
   $this->bindWorkerEvents();
   $this->bindHttpEvent();
   }

protected function bindWorkerEvents() {

    $init = function ($server, $worker_id) {
        require __DIR__.'/bootstrap/db_connection_pool.php';
        $this->conn_pool_swoole = create_db_connection_pool();
    }
    $this->httpService->on('WorkerStart', $init);
 }


2. What did you expect to see?

No Error

3. What did you see instead?

PHP Fatal error: Uncaught Error: Class "Swoole\Database\PDOPool" not found in /var/www/html/swoole-prac/bootstrap/db_connection_pool.php:49 Stack trace:

0 /var/www/html/swoole-prac/sw_service.php(92): create_db_connection_pool()

1 [internal function]: sw_service->{closure}()

2 {main}

thrown in /var/www/html/swoole-prac/bootstrap/db_connection_pool.php on line

4. What version of OpenSwoole are you using (show your `php --ri openswoole`)?

openswoole

Open Swoole => enabled Author => Open Swoole Group hello@openswoole.com Version => 22.0.0 Built => Jan 13 2023 22:50:54 coroutine => enabled with thread context debug => enabled trace_log => enabled epoll => enabled eventfd => enabled signalfd => enabled cpu_affinity => enabled spinlock => enabled rwlock => enabled sockets => enabled openssl => OpenSSL 3.0.2 15 Mar 2022 dtls => enabled http2 => enabled c-ares => 1.18.1 zlib => 1.2.11 mutex_timedlock => enabled pthread_barrier => enabled futex => enabled mysqlnd => enabled postgresql => enabled

Directive => Local Value => Master Value openswoole.enable_coroutine => On => On openswoole.enable_preemptive_scheduler => Off => Off openswoole.display_errors => On => On openswoole.unixsock_buffer_size => 8388608 => 8388608

5. What is your machine environment used (show your `uname -a` & `php -v` & `gcc -v`) ?

uname -a Linux fakhar-HP-Laptop 5.17.5-76051705-generic #202204271406~1651504840~20.04~63e51bd-Ubuntu SMP PREEMPT Wed Ma x86_64 x86_64 x86_64 GNU/Linux

PHP Version: PHP 8.1.14 (cli) (built: Jan 6 2023 15:23:18) (NTS) Copyright (c) The PHP Group Zend Engine v4.1.14, Copyright (c) Zend Technologies with Zend OPcache v8.1.14, Copyright (c), by Zend Technologies

GCC Version: gcc version 11.3.0 (Ubuntu 11.3.0-1ubuntu1~22.04)


@doubaokun 
I am trying "pgsql" driver based on your [response](https://github.com/openswoole/swoole-src/issues/271#issuecomment-1348506798) to the [closed issue](https://github.com/openswoole/swoole-src/issues/271)
You can also try the following OpenSwoole support channels:

* [Documentation](https://openswoole.com/docs) - Documentation for Open Swoole
* [Slack](https://goo.gl/forms/wooTTDmhbu30x4qC3) - Slack channel of Open Swoole
* [Discord](https://discord.gg/5QC57RNPpw) - Discord server of Open Swoole

openswoole / ext-openswoole

Class "Swoole\Database\PDOPool" Not Found : OpenSwoole version 22.0.0, PHP 8.1.14 #296

0 /var/www/html/swoole-prac/sw_service.php(92): create_db_connection_pool()

1 [internal function]: sw_service->{closure}()

2 {main}