如何在 slim 4 中设置和注入多个 PDO 数据库连接?

How to set up and inject multiple PDO database connections in slim 4?

我可以创建一个 PDO 的实例并成功注入它。我直接定义了 PDO::class 并用 __construct(PDO $pdo) 将它注入到构造函数中。我需要像 PDO1::classPDO2::class 这样的东西来注入它,如下所示: __construct(PDO1 $pdo1, PDO2 $pdo2) 但这显然不起作用。只有一个 PDO class,我需要做的是 2 个具有不同数据库凭据的实例。
最好的方法是什么?

我像这样通过 PDO 设置了一个数据库定义并且它有效:

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 this 文章中看到过类似的内容:

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?以及如何访问存储库中的连接 class 而无需注入整个容器?

如果您的应用程序中有多个 class 实例(这里您有多个 PDO class 实例),那么您必须配置每次注入哪一个.

这意味着 PDO 无法自动装配,因为 PHP-DI 无法根据 service/controller/etc.

来决定您想要哪个实例

您需要使用配置(参见 http://php-di.org/doc/php-definitions.html#autowired-objects)来定义为每个服务注入哪个实例(在您的示例中为 db1db2)。

return [
    MyService::class => DI\autowire()
        ->constructorParameter('pdo', DI\get('db1'))
        ->constructorParameter('pdo2', DI\get('db2')),

    'db1' => function (ContainerInterface $c) {
        return new PDO();
    },
    'db2' => function (ContainerInterface $c) {
        return new PDO();
    },
];

您有多种选择:

  1. 扩展 PDO
  2. 自动装配对象

1.扩展 PDO

use PDO;

class PDO2 extends PDO
{
    // must be empty
}

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;
    }
}

2。自动装配对象

查看 Matthieu Napoli 的回答: