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Filename :
_py_row.py
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# engine/_py_row.py # Copyright (C) 2005-2024 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: https://www.opensource.org/licenses/mit-license.php from __future__ import annotations import operator import typing from typing import Any from typing import Callable from typing import Dict from typing import Iterator from typing import List from typing import Mapping from typing import Optional from typing import Tuple from typing import Type if typing.TYPE_CHECKING: from .result import _KeyType from .result import _ProcessorsType from .result import _RawRowType from .result import _TupleGetterType from .result import ResultMetaData MD_INDEX = 0 # integer index in cursor.description class BaseRow: __slots__ = ("_parent", "_data", "_key_to_index") _parent: ResultMetaData _key_to_index: Mapping[_KeyType, int] _data: _RawRowType def __init__( self, parent: ResultMetaData, processors: Optional[_ProcessorsType], key_to_index: Mapping[_KeyType, int], data: _RawRowType, ): """Row objects are constructed by CursorResult objects.""" object.__setattr__(self, "_parent", parent) object.__setattr__(self, "_key_to_index", key_to_index) if processors: object.__setattr__( self, "_data", tuple( [ proc(value) if proc else value for proc, value in zip(processors, data) ] ), ) else: object.__setattr__(self, "_data", tuple(data)) def __reduce__(self) -> Tuple[Callable[..., BaseRow], Tuple[Any, ...]]: return ( rowproxy_reconstructor, (self.__class__, self.__getstate__()), ) def __getstate__(self) -> Dict[str, Any]: return {"_parent": self._parent, "_data": self._data} def __setstate__(self, state: Dict[str, Any]) -> None: parent = state["_parent"] object.__setattr__(self, "_parent", parent) object.__setattr__(self, "_data", state["_data"]) object.__setattr__(self, "_key_to_index", parent._key_to_index) def _values_impl(self) -> List[Any]: return list(self) def __iter__(self) -> Iterator[Any]: return iter(self._data) def __len__(self) -> int: return len(self._data) def __hash__(self) -> int: return hash(self._data) def __getitem__(self, key: Any) -> Any: return self._data[key] def _get_by_key_impl_mapping(self, key: str) -> Any: try: return self._data[self._key_to_index[key]] except KeyError: pass self._parent._key_not_found(key, False) def __getattr__(self, name: str) -> Any: try: return self._data[self._key_to_index[name]] except KeyError: pass self._parent._key_not_found(name, True) def _to_tuple_instance(self) -> Tuple[Any, ...]: return self._data # This reconstructor is necessary so that pickles with the Cy extension or # without use the same Binary format. def rowproxy_reconstructor( cls: Type[BaseRow], state: Dict[str, Any] ) -> BaseRow: obj = cls.__new__(cls) obj.__setstate__(state) return obj def tuplegetter(*indexes: int) -> _TupleGetterType: if len(indexes) != 1: for i in range(1, len(indexes)): if indexes[i - 1] != indexes[i] - 1: return operator.itemgetter(*indexes) # slice form is faster but returns a list if input is list return operator.itemgetter(slice(indexes[0], indexes[-1] + 1))