/**
     * Get a avatar from the database.
     *
     * @param avatarId The id of a avatar.
     * @return The InputStream.
     */
    public static byte[] getAvatarFromDatabase(int avatarId) {
        Connection conn = null;
        try {
            conn = ConnectionPool.getInstance().getConnection();
            try (PreparedStatement p = conn
                    .prepareStatement("SELECT avatar FROM \"user\" WHERE id = ?")) {
                p.setInt(1, avatarId);
                try (ResultSet rst = p.executeQuery()) {
                    if (rst.next()) {
                        return rst.getBytes("avatar");
                    }
                }
            }
        } catch (SQLException | StorageException e) {
            e.printStackTrace();
        } finally {
            ConnectionPool.getInstance().releaseConnection(conn);
        }
        return null;
    }