我可以创建一个实例PDO并将其成功注入。我PDO::class直接定义了，并将其注入到构造函数中__construct(PDO $pdo)。我需要类似的东西，PDO1::class并按PDO2::class如下方式注入它：__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？
我像这样通过PDO设置了一个数据库定义，它的工作原理是：
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;
}
}
我见过这样的事情在这个文章：
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？
您有多种选择：
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.自动接线对象
请参阅Matthieu Napoli的答案：https : //stackoverflow.com/a/57758106/1461181
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