Update 2025-04-24_11:44:19
This commit is contained in:
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# dialects/postgresql/psycopg.py
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# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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# mypy: ignore-errors
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r"""
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.. dialect:: postgresql+psycopg
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:name: psycopg (a.k.a. psycopg 3)
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:dbapi: psycopg
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:connectstring: postgresql+psycopg://user:password@host:port/dbname[?key=value&key=value...]
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:url: https://pypi.org/project/psycopg/
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``psycopg`` is the package and module name for version 3 of the ``psycopg``
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database driver, formerly known as ``psycopg2``. This driver is different
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enough from its ``psycopg2`` predecessor that SQLAlchemy supports it
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via a totally separate dialect; support for ``psycopg2`` is expected to remain
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for as long as that package continues to function for modern Python versions,
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and also remains the default dialect for the ``postgresql://`` dialect
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series.
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The SQLAlchemy ``psycopg`` dialect provides both a sync and an async
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implementation under the same dialect name. The proper version is
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selected depending on how the engine is created:
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* calling :func:`_sa.create_engine` with ``postgresql+psycopg://...`` will
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automatically select the sync version, e.g.::
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from sqlalchemy import create_engine
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sync_engine = create_engine(
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"postgresql+psycopg://scott:tiger@localhost/test"
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)
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* calling :func:`_asyncio.create_async_engine` with
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``postgresql+psycopg://...`` will automatically select the async version,
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e.g.::
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from sqlalchemy.ext.asyncio import create_async_engine
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asyncio_engine = create_async_engine(
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"postgresql+psycopg://scott:tiger@localhost/test"
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)
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The asyncio version of the dialect may also be specified explicitly using the
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``psycopg_async`` suffix, as::
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from sqlalchemy.ext.asyncio import create_async_engine
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asyncio_engine = create_async_engine(
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"postgresql+psycopg_async://scott:tiger@localhost/test"
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)
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.. seealso::
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:ref:`postgresql_psycopg2` - The SQLAlchemy ``psycopg``
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dialect shares most of its behavior with the ``psycopg2`` dialect.
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Further documentation is available there.
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Using a different Cursor class
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------------------------------
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One of the differences between ``psycopg`` and the older ``psycopg2``
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is how bound parameters are handled: ``psycopg2`` would bind them
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client side, while ``psycopg`` by default will bind them server side.
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It's possible to configure ``psycopg`` to do client side binding by
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specifying the ``cursor_factory`` to be ``ClientCursor`` when creating
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the engine::
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from psycopg import ClientCursor
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client_side_engine = create_engine(
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"postgresql+psycopg://...",
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connect_args={"cursor_factory": ClientCursor},
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)
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Similarly when using an async engine the ``AsyncClientCursor`` can be
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specified::
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from psycopg import AsyncClientCursor
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client_side_engine = create_async_engine(
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"postgresql+psycopg://...",
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connect_args={"cursor_factory": AsyncClientCursor},
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)
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.. seealso::
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`Client-side-binding cursors <https://www.psycopg.org/psycopg3/docs/advanced/cursors.html#client-side-binding-cursors>`_
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""" # noqa
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from __future__ import annotations
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from collections import deque
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import logging
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import re
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from typing import cast
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from typing import TYPE_CHECKING
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from . import ranges
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from ._psycopg_common import _PGDialect_common_psycopg
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from ._psycopg_common import _PGExecutionContext_common_psycopg
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from .base import INTERVAL
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from .base import PGCompiler
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from .base import PGIdentifierPreparer
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from .base import REGCONFIG
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from .json import JSON
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from .json import JSONB
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from .json import JSONPathType
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from .types import CITEXT
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from ... import pool
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from ... import util
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from ...engine import AdaptedConnection
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from ...sql import sqltypes
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from ...util.concurrency import await_fallback
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from ...util.concurrency import await_only
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if TYPE_CHECKING:
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from typing import Iterable
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from psycopg import AsyncConnection
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logger = logging.getLogger("sqlalchemy.dialects.postgresql")
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class _PGString(sqltypes.String):
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render_bind_cast = True
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class _PGREGCONFIG(REGCONFIG):
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render_bind_cast = True
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class _PGJSON(JSON):
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def bind_processor(self, dialect):
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return self._make_bind_processor(None, dialect._psycopg_Json)
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def result_processor(self, dialect, coltype):
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return None
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class _PGJSONB(JSONB):
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def bind_processor(self, dialect):
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return self._make_bind_processor(None, dialect._psycopg_Jsonb)
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def result_processor(self, dialect, coltype):
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return None
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class _PGJSONIntIndexType(sqltypes.JSON.JSONIntIndexType):
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__visit_name__ = "json_int_index"
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render_bind_cast = True
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class _PGJSONStrIndexType(sqltypes.JSON.JSONStrIndexType):
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__visit_name__ = "json_str_index"
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render_bind_cast = True
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class _PGJSONPathType(JSONPathType):
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pass
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class _PGInterval(INTERVAL):
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render_bind_cast = True
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class _PGTimeStamp(sqltypes.DateTime):
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render_bind_cast = True
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class _PGDate(sqltypes.Date):
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render_bind_cast = True
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class _PGTime(sqltypes.Time):
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render_bind_cast = True
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class _PGInteger(sqltypes.Integer):
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render_bind_cast = True
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class _PGSmallInteger(sqltypes.SmallInteger):
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render_bind_cast = True
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class _PGNullType(sqltypes.NullType):
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render_bind_cast = True
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class _PGBigInteger(sqltypes.BigInteger):
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render_bind_cast = True
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class _PGBoolean(sqltypes.Boolean):
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render_bind_cast = True
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class _PsycopgRange(ranges.AbstractSingleRangeImpl):
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def bind_processor(self, dialect):
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psycopg_Range = cast(PGDialect_psycopg, dialect)._psycopg_Range
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def to_range(value):
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if isinstance(value, ranges.Range):
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value = psycopg_Range(
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value.lower, value.upper, value.bounds, value.empty
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)
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return value
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return to_range
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def result_processor(self, dialect, coltype):
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def to_range(value):
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if value is not None:
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value = ranges.Range(
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value._lower,
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value._upper,
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bounds=value._bounds if value._bounds else "[)",
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empty=not value._bounds,
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)
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return value
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return to_range
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class _PsycopgMultiRange(ranges.AbstractMultiRangeImpl):
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def bind_processor(self, dialect):
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psycopg_Range = cast(PGDialect_psycopg, dialect)._psycopg_Range
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psycopg_Multirange = cast(
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PGDialect_psycopg, dialect
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)._psycopg_Multirange
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NoneType = type(None)
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def to_range(value):
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if isinstance(value, (str, NoneType, psycopg_Multirange)):
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return value
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return psycopg_Multirange(
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[
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psycopg_Range(
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element.lower,
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element.upper,
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element.bounds,
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element.empty,
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)
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for element in cast("Iterable[ranges.Range]", value)
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]
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)
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return to_range
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def result_processor(self, dialect, coltype):
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def to_range(value):
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if value is None:
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return None
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else:
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return ranges.MultiRange(
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ranges.Range(
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elem._lower,
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elem._upper,
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bounds=elem._bounds if elem._bounds else "[)",
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empty=not elem._bounds,
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)
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for elem in value
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)
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return to_range
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class PGExecutionContext_psycopg(_PGExecutionContext_common_psycopg):
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pass
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class PGCompiler_psycopg(PGCompiler):
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pass
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class PGIdentifierPreparer_psycopg(PGIdentifierPreparer):
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pass
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def _log_notices(diagnostic):
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logger.info("%s: %s", diagnostic.severity, diagnostic.message_primary)
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class PGDialect_psycopg(_PGDialect_common_psycopg):
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driver = "psycopg"
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supports_statement_cache = True
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supports_server_side_cursors = True
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default_paramstyle = "pyformat"
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supports_sane_multi_rowcount = True
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execution_ctx_cls = PGExecutionContext_psycopg
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statement_compiler = PGCompiler_psycopg
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preparer = PGIdentifierPreparer_psycopg
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psycopg_version = (0, 0)
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_has_native_hstore = True
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_psycopg_adapters_map = None
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colspecs = util.update_copy(
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_PGDialect_common_psycopg.colspecs,
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{
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sqltypes.String: _PGString,
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REGCONFIG: _PGREGCONFIG,
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JSON: _PGJSON,
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CITEXT: CITEXT,
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sqltypes.JSON: _PGJSON,
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JSONB: _PGJSONB,
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sqltypes.JSON.JSONPathType: _PGJSONPathType,
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sqltypes.JSON.JSONIntIndexType: _PGJSONIntIndexType,
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sqltypes.JSON.JSONStrIndexType: _PGJSONStrIndexType,
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sqltypes.Interval: _PGInterval,
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INTERVAL: _PGInterval,
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sqltypes.Date: _PGDate,
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sqltypes.DateTime: _PGTimeStamp,
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sqltypes.Time: _PGTime,
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sqltypes.Integer: _PGInteger,
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sqltypes.SmallInteger: _PGSmallInteger,
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sqltypes.BigInteger: _PGBigInteger,
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ranges.AbstractSingleRange: _PsycopgRange,
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ranges.AbstractMultiRange: _PsycopgMultiRange,
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},
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)
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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if self.dbapi:
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m = re.match(r"(\d+)\.(\d+)(?:\.(\d+))?", self.dbapi.__version__)
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if m:
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self.psycopg_version = tuple(
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int(x) for x in m.group(1, 2, 3) if x is not None
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)
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if self.psycopg_version < (3, 0, 2):
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raise ImportError(
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"psycopg version 3.0.2 or higher is required."
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)
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from psycopg.adapt import AdaptersMap
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self._psycopg_adapters_map = adapters_map = AdaptersMap(
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self.dbapi.adapters
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)
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if self._native_inet_types is False:
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import psycopg.types.string
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adapters_map.register_loader(
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"inet", psycopg.types.string.TextLoader
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)
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adapters_map.register_loader(
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"cidr", psycopg.types.string.TextLoader
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)
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if self._json_deserializer:
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from psycopg.types.json import set_json_loads
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set_json_loads(self._json_deserializer, adapters_map)
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if self._json_serializer:
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from psycopg.types.json import set_json_dumps
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set_json_dumps(self._json_serializer, adapters_map)
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def create_connect_args(self, url):
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# see https://github.com/psycopg/psycopg/issues/83
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cargs, cparams = super().create_connect_args(url)
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if self._psycopg_adapters_map:
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cparams["context"] = self._psycopg_adapters_map
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if self.client_encoding is not None:
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cparams["client_encoding"] = self.client_encoding
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return cargs, cparams
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def _type_info_fetch(self, connection, name):
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from psycopg.types import TypeInfo
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return TypeInfo.fetch(connection.connection.driver_connection, name)
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def initialize(self, connection):
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super().initialize(connection)
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# PGDialect.initialize() checks server version for <= 8.2 and sets
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# this flag to False if so
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if not self.insert_returning:
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self.insert_executemany_returning = False
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# HSTORE can't be registered until we have a connection so that
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# we can look up its OID, so we set up this adapter in
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# initialize()
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if self.use_native_hstore:
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info = self._type_info_fetch(connection, "hstore")
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self._has_native_hstore = info is not None
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if self._has_native_hstore:
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from psycopg.types.hstore import register_hstore
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# register the adapter for connections made subsequent to
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# this one
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assert self._psycopg_adapters_map
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register_hstore(info, self._psycopg_adapters_map)
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# register the adapter for this connection
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assert connection.connection
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register_hstore(info, connection.connection.driver_connection)
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@classmethod
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def import_dbapi(cls):
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import psycopg
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return psycopg
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@classmethod
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def get_async_dialect_cls(cls, url):
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return PGDialectAsync_psycopg
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@util.memoized_property
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def _isolation_lookup(self):
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return {
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"READ COMMITTED": self.dbapi.IsolationLevel.READ_COMMITTED,
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"READ UNCOMMITTED": self.dbapi.IsolationLevel.READ_UNCOMMITTED,
|
||||
"REPEATABLE READ": self.dbapi.IsolationLevel.REPEATABLE_READ,
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||||
"SERIALIZABLE": self.dbapi.IsolationLevel.SERIALIZABLE,
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||||
}
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||||
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@util.memoized_property
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def _psycopg_Json(self):
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from psycopg.types import json
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||||
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return json.Json
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||||
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||||
@util.memoized_property
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||||
def _psycopg_Jsonb(self):
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||||
from psycopg.types import json
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||||
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||||
return json.Jsonb
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||||
|
||||
@util.memoized_property
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||||
def _psycopg_TransactionStatus(self):
|
||||
from psycopg.pq import TransactionStatus
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||||
|
||||
return TransactionStatus
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||||
|
||||
@util.memoized_property
|
||||
def _psycopg_Range(self):
|
||||
from psycopg.types.range import Range
|
||||
|
||||
return Range
|
||||
|
||||
@util.memoized_property
|
||||
def _psycopg_Multirange(self):
|
||||
from psycopg.types.multirange import Multirange
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||||
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||||
return Multirange
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||||
|
||||
def _do_isolation_level(self, connection, autocommit, isolation_level):
|
||||
connection.autocommit = autocommit
|
||||
connection.isolation_level = isolation_level
|
||||
|
||||
def get_isolation_level(self, dbapi_connection):
|
||||
status_before = dbapi_connection.info.transaction_status
|
||||
value = super().get_isolation_level(dbapi_connection)
|
||||
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||||
# don't rely on psycopg providing enum symbols, compare with
|
||||
# eq/ne
|
||||
if status_before == self._psycopg_TransactionStatus.IDLE:
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||||
dbapi_connection.rollback()
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||||
return value
|
||||
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||||
def set_isolation_level(self, dbapi_connection, level):
|
||||
if level == "AUTOCOMMIT":
|
||||
self._do_isolation_level(
|
||||
dbapi_connection, autocommit=True, isolation_level=None
|
||||
)
|
||||
else:
|
||||
self._do_isolation_level(
|
||||
dbapi_connection,
|
||||
autocommit=False,
|
||||
isolation_level=self._isolation_lookup[level],
|
||||
)
|
||||
|
||||
def set_readonly(self, connection, value):
|
||||
connection.read_only = value
|
||||
|
||||
def get_readonly(self, connection):
|
||||
return connection.read_only
|
||||
|
||||
def on_connect(self):
|
||||
def notices(conn):
|
||||
conn.add_notice_handler(_log_notices)
|
||||
|
||||
fns = [notices]
|
||||
|
||||
if self.isolation_level is not None:
|
||||
|
||||
def on_connect(conn):
|
||||
self.set_isolation_level(conn, self.isolation_level)
|
||||
|
||||
fns.append(on_connect)
|
||||
|
||||
# fns always has the notices function
|
||||
def on_connect(conn):
|
||||
for fn in fns:
|
||||
fn(conn)
|
||||
|
||||
return on_connect
|
||||
|
||||
def is_disconnect(self, e, connection, cursor):
|
||||
if isinstance(e, self.dbapi.Error) and connection is not None:
|
||||
if connection.closed or connection.broken:
|
||||
return True
|
||||
return False
|
||||
|
||||
def _do_prepared_twophase(self, connection, command, recover=False):
|
||||
dbapi_conn = connection.connection.dbapi_connection
|
||||
if (
|
||||
recover
|
||||
# don't rely on psycopg providing enum symbols, compare with
|
||||
# eq/ne
|
||||
or dbapi_conn.info.transaction_status
|
||||
!= self._psycopg_TransactionStatus.IDLE
|
||||
):
|
||||
dbapi_conn.rollback()
|
||||
before_autocommit = dbapi_conn.autocommit
|
||||
try:
|
||||
if not before_autocommit:
|
||||
self._do_autocommit(dbapi_conn, True)
|
||||
dbapi_conn.execute(command)
|
||||
finally:
|
||||
if not before_autocommit:
|
||||
self._do_autocommit(dbapi_conn, before_autocommit)
|
||||
|
||||
def do_rollback_twophase(
|
||||
self, connection, xid, is_prepared=True, recover=False
|
||||
):
|
||||
if is_prepared:
|
||||
self._do_prepared_twophase(
|
||||
connection, f"ROLLBACK PREPARED '{xid}'", recover=recover
|
||||
)
|
||||
else:
|
||||
self.do_rollback(connection.connection)
|
||||
|
||||
def do_commit_twophase(
|
||||
self, connection, xid, is_prepared=True, recover=False
|
||||
):
|
||||
if is_prepared:
|
||||
self._do_prepared_twophase(
|
||||
connection, f"COMMIT PREPARED '{xid}'", recover=recover
|
||||
)
|
||||
else:
|
||||
self.do_commit(connection.connection)
|
||||
|
||||
@util.memoized_property
|
||||
def _dialect_specific_select_one(self):
|
||||
return ";"
|
||||
|
||||
|
||||
class AsyncAdapt_psycopg_cursor:
|
||||
__slots__ = ("_cursor", "await_", "_rows")
|
||||
|
||||
_psycopg_ExecStatus = None
|
||||
|
||||
def __init__(self, cursor, await_) -> None:
|
||||
self._cursor = cursor
|
||||
self.await_ = await_
|
||||
self._rows = deque()
|
||||
|
||||
def __getattr__(self, name):
|
||||
return getattr(self._cursor, name)
|
||||
|
||||
@property
|
||||
def arraysize(self):
|
||||
return self._cursor.arraysize
|
||||
|
||||
@arraysize.setter
|
||||
def arraysize(self, value):
|
||||
self._cursor.arraysize = value
|
||||
|
||||
def close(self):
|
||||
self._rows.clear()
|
||||
# Normal cursor just call _close() in a non-sync way.
|
||||
self._cursor._close()
|
||||
|
||||
def execute(self, query, params=None, **kw):
|
||||
result = self.await_(self._cursor.execute(query, params, **kw))
|
||||
# sqlalchemy result is not async, so need to pull all rows here
|
||||
res = self._cursor.pgresult
|
||||
|
||||
# don't rely on psycopg providing enum symbols, compare with
|
||||
# eq/ne
|
||||
if res and res.status == self._psycopg_ExecStatus.TUPLES_OK:
|
||||
rows = self.await_(self._cursor.fetchall())
|
||||
self._rows = deque(rows)
|
||||
return result
|
||||
|
||||
def executemany(self, query, params_seq):
|
||||
return self.await_(self._cursor.executemany(query, params_seq))
|
||||
|
||||
def __iter__(self):
|
||||
while self._rows:
|
||||
yield self._rows.popleft()
|
||||
|
||||
def fetchone(self):
|
||||
if self._rows:
|
||||
return self._rows.popleft()
|
||||
else:
|
||||
return None
|
||||
|
||||
def fetchmany(self, size=None):
|
||||
if size is None:
|
||||
size = self._cursor.arraysize
|
||||
|
||||
rr = self._rows
|
||||
return [rr.popleft() for _ in range(min(size, len(rr)))]
|
||||
|
||||
def fetchall(self):
|
||||
retval = list(self._rows)
|
||||
self._rows.clear()
|
||||
return retval
|
||||
|
||||
|
||||
class AsyncAdapt_psycopg_ss_cursor(AsyncAdapt_psycopg_cursor):
|
||||
def execute(self, query, params=None, **kw):
|
||||
self.await_(self._cursor.execute(query, params, **kw))
|
||||
return self
|
||||
|
||||
def close(self):
|
||||
self.await_(self._cursor.close())
|
||||
|
||||
def fetchone(self):
|
||||
return self.await_(self._cursor.fetchone())
|
||||
|
||||
def fetchmany(self, size=0):
|
||||
return self.await_(self._cursor.fetchmany(size))
|
||||
|
||||
def fetchall(self):
|
||||
return self.await_(self._cursor.fetchall())
|
||||
|
||||
def __iter__(self):
|
||||
iterator = self._cursor.__aiter__()
|
||||
while True:
|
||||
try:
|
||||
yield self.await_(iterator.__anext__())
|
||||
except StopAsyncIteration:
|
||||
break
|
||||
|
||||
|
||||
class AsyncAdapt_psycopg_connection(AdaptedConnection):
|
||||
_connection: AsyncConnection
|
||||
__slots__ = ()
|
||||
await_ = staticmethod(await_only)
|
||||
|
||||
def __init__(self, connection) -> None:
|
||||
self._connection = connection
|
||||
|
||||
def __getattr__(self, name):
|
||||
return getattr(self._connection, name)
|
||||
|
||||
def execute(self, query, params=None, **kw):
|
||||
cursor = self.await_(self._connection.execute(query, params, **kw))
|
||||
return AsyncAdapt_psycopg_cursor(cursor, self.await_)
|
||||
|
||||
def cursor(self, *args, **kw):
|
||||
cursor = self._connection.cursor(*args, **kw)
|
||||
if hasattr(cursor, "name"):
|
||||
return AsyncAdapt_psycopg_ss_cursor(cursor, self.await_)
|
||||
else:
|
||||
return AsyncAdapt_psycopg_cursor(cursor, self.await_)
|
||||
|
||||
def commit(self):
|
||||
self.await_(self._connection.commit())
|
||||
|
||||
def rollback(self):
|
||||
self.await_(self._connection.rollback())
|
||||
|
||||
def close(self):
|
||||
self.await_(self._connection.close())
|
||||
|
||||
@property
|
||||
def autocommit(self):
|
||||
return self._connection.autocommit
|
||||
|
||||
@autocommit.setter
|
||||
def autocommit(self, value):
|
||||
self.set_autocommit(value)
|
||||
|
||||
def set_autocommit(self, value):
|
||||
self.await_(self._connection.set_autocommit(value))
|
||||
|
||||
def set_isolation_level(self, value):
|
||||
self.await_(self._connection.set_isolation_level(value))
|
||||
|
||||
def set_read_only(self, value):
|
||||
self.await_(self._connection.set_read_only(value))
|
||||
|
||||
def set_deferrable(self, value):
|
||||
self.await_(self._connection.set_deferrable(value))
|
||||
|
||||
|
||||
class AsyncAdaptFallback_psycopg_connection(AsyncAdapt_psycopg_connection):
|
||||
__slots__ = ()
|
||||
await_ = staticmethod(await_fallback)
|
||||
|
||||
|
||||
class PsycopgAdaptDBAPI:
|
||||
def __init__(self, psycopg) -> None:
|
||||
self.psycopg = psycopg
|
||||
|
||||
for k, v in self.psycopg.__dict__.items():
|
||||
if k != "connect":
|
||||
self.__dict__[k] = v
|
||||
|
||||
def connect(self, *arg, **kw):
|
||||
async_fallback = kw.pop("async_fallback", False)
|
||||
creator_fn = kw.pop(
|
||||
"async_creator_fn", self.psycopg.AsyncConnection.connect
|
||||
)
|
||||
if util.asbool(async_fallback):
|
||||
return AsyncAdaptFallback_psycopg_connection(
|
||||
await_fallback(creator_fn(*arg, **kw))
|
||||
)
|
||||
else:
|
||||
return AsyncAdapt_psycopg_connection(
|
||||
await_only(creator_fn(*arg, **kw))
|
||||
)
|
||||
|
||||
|
||||
class PGDialectAsync_psycopg(PGDialect_psycopg):
|
||||
is_async = True
|
||||
supports_statement_cache = True
|
||||
|
||||
@classmethod
|
||||
def import_dbapi(cls):
|
||||
import psycopg
|
||||
from psycopg.pq import ExecStatus
|
||||
|
||||
AsyncAdapt_psycopg_cursor._psycopg_ExecStatus = ExecStatus
|
||||
|
||||
return PsycopgAdaptDBAPI(psycopg)
|
||||
|
||||
@classmethod
|
||||
def get_pool_class(cls, url):
|
||||
async_fallback = url.query.get("async_fallback", False)
|
||||
|
||||
if util.asbool(async_fallback):
|
||||
return pool.FallbackAsyncAdaptedQueuePool
|
||||
else:
|
||||
return pool.AsyncAdaptedQueuePool
|
||||
|
||||
def _type_info_fetch(self, connection, name):
|
||||
from psycopg.types import TypeInfo
|
||||
|
||||
adapted = connection.connection
|
||||
return adapted.await_(TypeInfo.fetch(adapted.driver_connection, name))
|
||||
|
||||
def _do_isolation_level(self, connection, autocommit, isolation_level):
|
||||
connection.set_autocommit(autocommit)
|
||||
connection.set_isolation_level(isolation_level)
|
||||
|
||||
def _do_autocommit(self, connection, value):
|
||||
connection.set_autocommit(value)
|
||||
|
||||
def set_readonly(self, connection, value):
|
||||
connection.set_read_only(value)
|
||||
|
||||
def set_deferrable(self, connection, value):
|
||||
connection.set_deferrable(value)
|
||||
|
||||
def get_driver_connection(self, connection):
|
||||
return connection._connection
|
||||
|
||||
|
||||
dialect = PGDialect_psycopg
|
||||
dialect_async = PGDialectAsync_psycopg
|
||||
Reference in New Issue
Block a user