如何在Slim 4中设置和注入多个PDO数据库连接? [英] How to set up and inject multiple PDO database connections in slim 4?

问题描述

我可以创建PDO的实例并将其成功注入.我直接定义了PDO::class，并使用__construct(PDO $pdo)将其注入到构造函数中.我需要像PDO1::class和PDO2::class这样的东西来注入它，如下所示:__construct(PDO1 $pdo1, PDO2 $pdo2)但这显然行不通.只有一个PDO类，我需要做的是使用不同数据库凭据的2个实例.
最好的方法是什么?

I could make an instance of PDO and inject it successfully. I defined the PDO::class directly and injected it in the constructor with __construct(PDO $pdo). I would need something like PDO1::class and PDO2::class to inject it like follows: __construct(PDO1 $pdo1, PDO2 $pdo2) but that obviously doesn't work. There is only one PDO class and what I need to do is 2 instances of it with different database credentials.
What is the best way to do it?

我像这样通过PDO设置了一个数据库定义，它的工作原理是:

I set up one definition of a database via PDO like this and it works:

文件:dependencies.php

use DI\ContainerBuilder;
use Psr\Container\ContainerInterface;

return function (ContainerBuilder $containerBuilder) {
    $containerBuilder->addDefinitions([
        PDO::class => function (ContainerInterface $c) {
            $dbSettings = $c->get('settings')['db1'];
            $dsn = 'mysql:host=' . $dbSettings['host'] . ';dbname=' . $dbSettings['dbname'];
            $options = [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false,
            ];
            return new PDO($dsn, $dbSettings['user'], $dbSettings['pass'], $options);
        },
    ]);
};

文件:index.php

...
// Set up dependencies
$dependencies = require __DIR__ . '/../app/dependencies.php';
$dependencies($containerBuilder);
// Build PHP-DI Container instance
$container = $containerBuilder->build();
// Set container to create App with on AppFactory
AppFactory::setContainer($container);
// Instantiate the app
$app = AppFactory::create();
...

文件SomeRepository.php

use PDO;

class SomeRepository{

    protected $pdo;

    public function __construct(PDO $pdo) {
        $this->pdo = $pdo;
    }
}

我在这篇文章中看到了这样的内容:

I've seen something like this in this article:

return function (ContainerBuilder $containerBuilder) {
    $containerBuilder->addDefinitions([
        'db1' => function (ContainerInterface $c) {
            $db1Settings = $c->get('settings')['db1'];
            $dsn = 'mysql:host=' . $db1Settings['host'] . ';dbname=' . $db1Settings['dbname'];
            $options = [ ... ];
            return new PDO($dsn, $db1Settings['user'], $db1Settings['pass'],$options);
        },
        'db2' => function (ContainerInterface $c) {
            $db2Settings = $c->get('settings')['db2'];
            $dsn = 'mysql:host=' . $db2Settings['host'] . ';dbname=' . $db2Settings['dbname'];
            $options = [ ... ];
            return new PDO($dsn, $db2Settings['user'], $db2Settings['pass'],$options);
        },

    ]);
};

但这是最好的方法吗?以及如何在无需注入整个容器的情况下访问存储库类中的连接?

But is it the best way to do it? And how can I access the connections in a repository class without having to inject the whole container?

推荐答案

您有多种选择:

1. 连接代理
2. 扩展PDO
3. 自动连线的对象

1.连接代理

示例:

use PDO;

class ConnectionProxy
{
    private $pdo;

    private $pdo2;

    public function __construct(PDO $pdo, PDO $pdo2)
    {
        $this->pdo = $pdo;
        $this->pdo2 = $pdo2;
    }

    public function getPdo(): PDO
    {
        return $this->pdo;
    }

    public function getPdo2(): PDO
    {
        return $this->pdo2;
    }
}

容器定义:

return [
    ConnectionProxy::class => function (ContainerInterface $c) {
        return new ConnectionProxy(
            $container->get('db1'),
            $container->get('db2')
        );
    },
    'db1' => function (ContainerInterface $container) {
        return new PDO(...);
    },
    'db2' => function (ContainerInterface $container) {
        return new PDO(...);
    },
];

用法

class MyRepository
{
    private $pdo;

    private $pdo2;

    public function __construct(ConnectionProxy $connectionProxy)
    {
        $this->pdo = $connectionProxy->getPdo();
        $this->pdo2 = $connectionProxy->getPdo2();
    }
}

2.扩展PDO

use PDO;

class PDO2 extends PDO
{

}

容器定义:

use PDO2;

// ...

return [
    PDO::class => function (ContainerInterface $container) {
        return new PDO(...);
    },

    PDO2::class => function (ContainerInterface $container) {
        return new PDO2(...);
    },
];

用法

use PDO;
use PDO2;

class MyRepository
{
    private $pdo;

    private $pdo2;

    public function __construct(PDO $pdo, PDO2 $pdo2)
    {
        $this->pdo = $pdo;
        $this->pdo2 = $pdo2;
    }
}

3.自动连线的对象

请参阅Matthieu Napoli的答案: https://stackoverflow.com/a/57758106/1461181

See Matthieu Napoli's answer: https://stackoverflow.com/a/57758106/1461181

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