What are the potential issues with the database class code provided in the forum thread?

The potential issue with the database class code provided in the forum thread is that it is not securely handling user input, leaving it vulnerable to SQL injection attacks. To solve this issue, you should use prepared statements with parameterized queries to sanitize user input and prevent SQL injection attacks. 

// Fix for securely handling user input in the database class

class Database {
    private $connection;

    public function __construct($host, $username, $password, $database) {
        $this->connection = new mysqli($host, $username, $password, $database);
        if ($this->connection->connect_error) {
            die("Connection failed: " . $this->connection->connect_error);
        }
    }

    public function query($sql, $params = []) {
        $statement = $this->connection->prepare($sql);
        
        if ($statement === false) {
            die("Error preparing query: " . $this->connection->error);
        }
        
        if (!empty($params)) {
            $types = str_repeat('s', count($params));
            $statement->bind_param($types, ...$params);
        }
        
        $statement->execute();
        
        return $statement->get_result();
    }

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

Keywords

SQL injection PDO prepared statements error handling database connection.

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