如何使用Laravel连接数据库

DB_CONNECTION=mysqlDB_HOST=127.0.0.1DB_PORT=3306DB_DATABASE=database_nameDB_USERNAME=database_usernameDB_PASSWORD=database_password

'connections' => [    'mysql' => [        'driver' => 'mysql',        'url' => env('DATABASE_URL'),        'host' => env('DB_HOST', '127.0.0.1'),        'port' => env('DB_PORT', '3306'),        'database' => env('DB_DATABASE', 'forge'),        'username' => env('DB_USERNAME', 'forge'),        'password' => env('DB_PASSWORD', ''),        'unix_socket' => env('DB_SOCKET', ''),        'charset' => 'utf8mb4',        'collation' => 'utf8mb4_unicode_ci',        'prefix' => '',        'prefix_indexes' => true,        'strict' => true,        'engine' => null,        'options' => extension_loaded('pdo_mysql') ? array_filter([            PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),        ]) : [],    ],],

$user = new User;$user->name = 'John Doe';$user->email = 'john@example.com';$user->save();

$users = DB::table('users')            ->where('name', 'John Doe')            ->get();