In the context of the forum thread, what are the drawbacks of relying on a single static class for database interaction and application logic?

Relying on a single static class for database interaction and application logic can lead to tight coupling and difficulties in testing and maintaining the code. To solve this issue, it is recommended to use a more modular and flexible approach, such as implementing a repository pattern or using dependency injection to decouple the database interaction from the application logic. 

class Database {
    private $connection;

    public function __construct($host, $username, $password, $database) {
        $this->connection = new mysqli($host, $username, $password, $database);
    }

    public function query($sql) {
        return $this->connection->query($sql);
    }

    public function close() {
        $this->connection->close();
    }
}

class UserRepository {
    private $database;

    public function __construct(Database $database) {
        $this->database = $database;
    }

    public function getUserById($id) {
        $sql = "SELECT * FROM users WHERE id = $id";
        return $this->database->query($sql);
    }
}

$database = new Database('localhost', 'username', 'password', 'database');
$userRepository = new UserRepository($database);
$user = $userRepository->getUserById(1);

Keywords

singleton pattern static class database abstraction layer code maintainability scalability

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