"""PEP 249 database adapter protocols using structural subtyping (PEP 544)."""

from __future__ import annotations

from typing import Any, Protocol, runtime_checkable


@runtime_checkable
class Connection(Protocol):
    """PEP 249 Connection Object Protocol."""

    def close(self) -> None:
        """Close the connection now."""
        ...

    def commit(self) -> None:
        """Commit the current transaction to the database."""
        ...

    def cursor(self) -> Any:
        """Return a new Cursor Object using the connection."""
        ...

    def rollback(self) -> None:
        """Roll back the current transaction, discarding changes."""
        ...