I've just started using Slim 4 (also brand new to Slim as a whole) and after reading up and following some articles I've managed to get a skeleton app setup with a PDO connection to the DB.
I'm now looking to inject a second PDO instance so that a second database can be used based on the request, though I'm struggling to get my head around how to do this.
My current setup is:
settings.php
$settings['db'] = [
'driver' => 'mysql',
'host' => 'database',
'username' => 'root',
'database' => 'demo',
'password' => 'password',
'flags' => [
// Turn off persistent connections
PDO::ATTR_PERSISTENT => false,
// Enable exceptions
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
// Emulate prepared statements
PDO::ATTR_EMULATE_PREPARES => true,
// Set default fetch mode to array
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
],
];
container.php
return [
Configuration::class => function () {
return new Configuration(require __DIR__ . '/settings.php');
},
App::class => function (ContainerInterface $container) {
AppFactory::setContainer($container);
$app = AppFactory::create();
return $app;
},
PDO::class => function (ContainerInterface $container) {
$config = $container->get(Configuration::class);
$host = $config->getString('db.host');
$dbname = $config->getString('db.database');
$username = $config->getString('db.username');
$password = $config->getString('db.password');
$dsn = "mysql:host=$host;dbname=$dbname;";
return new PDO($dsn, $username, $password);
},
];
Example usage in repository
class UserReaderRepository
{
/**
* @var PDO The database connection
*/
private $connection;
/**
* Constructor.
*
* @param PDO $connection The database connection
*/
public function __construct(PDO $connection)
{
$this->connection = $connection;
}
/**
* Get user by the given user id.
*
* @throws DomainException
*
* @return array The user data
*/
public function getUsers(): array
{
$sql = "SELECT user_id, title, firstname, surname, email_address FROM user us;";
$statement = $this->connection->prepare($sql);
$statement->execute();
From what I can tell, the PDO class itself is instantiated within container.php - how do i modify this as to instantiate 2 separate PDO classes - and how do i use them within repositories later on?
For clarity, I've tried looking at How to set up and inject multiple PDO database connections in slim 4? but I don't quite understand where to define the PDO classes. I've also looked here which didn't seem to help - I don't have a dependencies.php, the closest I have is middleware.php but when I try this I get the error Uncaught Error: Cannot use object of type DI\Container as array in /var/www/config/middleware.php:
return function (App $app) {
// Parse json, form data and xml
$app->addBodyParsingMiddleware();
// Add global middleware to app
$app->addRoutingMiddleware();
$container = $app->getContainer();
// PDO database library
$container['db'] = function ($c) {
$settings = $c->get('settings')['db'];
$pdo = new PDO("mysql:host=" . $settings['host'] . ";dbname=" . $settings['dbname'],
$settings['user'], $settings['pass']);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
return $pdo;
};
// Error handler
$settings = $container->get(Configuration::class)->getArray('error_handler_middleware');
$display_error_details = (bool)$settings['display_error_details'];
$log_errors = (bool)$settings['log_errors'];
$log_error_details = (bool)$settings['log_error_details'];
$app->addErrorMiddleware($display_error_details, $log_errors, $log_error_details);
};
