Class ForUpdateArg

lib/sqlalchemy/sql/selectable.py:3332–3399

class ForUpdateArg(ClauseElement):
    _traverse_internals: _TraverseInternalsType = [
        ("of", InternalTraversal.dp_clauseelement_list),
        ("nowait", InternalTraversal.dp_boolean),
        ("read", InternalTraversal.dp_boolean),
        ("skip_locked", InternalTraversal.dp_boolean),
        ("key_share", InternalTraversal.dp_boolean),
    ]

    of: Optional[Sequence[ClauseElement]]
    nowait: bool
    read: bool
    skip_locked: bool

    @classmethod
    def _from_argument(
        cls, with_for_update: ForUpdateParameter
    ) -> Optional[ForUpdateArg]:
        if isinstance(with_for_update, ForUpdateArg):
            return with_for_update
        elif with_for_update in (None, False):
            return None
        elif with_for_update is True:
            return ForUpdateArg()
        else:
            return ForUpdateArg(**cast("Dict[str, Any]", with_for_update))

    def __eq__(self, other: Any) -> bool:
        return (
            isinstance(other, ForUpdateArg)
            and other.nowait == self.nowait
            and other.read == self.read
            and other.skip_locked == self.skip_locked
            and other.key_share == self.key_share
            and other.of is self.of
        )

    def __ne__(self, other: Any) -> bool:
        return not self.__eq__(other)

    def __hash__(self) -> int:
        return id(self)

    def __init__(
        self,
        *,
        nowait: bool = False,
        read: bool = False,
        of: Optional[_ForUpdateOfArgument] = None,
        skip_locked: bool = False,
        key_share: bool = False,
    ):
        """Represents arguments specified to
        :meth:`_expression.Select.for_update`.

        """

        self.nowait = nowait