Update 2025-04-24_11:44:19
This commit is contained in:
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# connectors/__init__.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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from ..engine.interfaces import Dialect
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class Connector(Dialect):
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"""Base class for dialect mixins, for DBAPIs that work
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across entirely different database backends.
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Currently the only such mixin is pyodbc.
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"""
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# connectors/aioodbc.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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from __future__ import annotations
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from typing import TYPE_CHECKING
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from .asyncio import AsyncAdapt_dbapi_connection
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from .asyncio import AsyncAdapt_dbapi_cursor
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from .asyncio import AsyncAdapt_dbapi_ss_cursor
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from .asyncio import AsyncAdaptFallback_dbapi_connection
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from .pyodbc import PyODBCConnector
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from .. import pool
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from .. import util
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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 ..engine.interfaces import ConnectArgsType
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from ..engine.url import URL
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class AsyncAdapt_aioodbc_cursor(AsyncAdapt_dbapi_cursor):
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__slots__ = ()
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def setinputsizes(self, *inputsizes):
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# see https://github.com/aio-libs/aioodbc/issues/451
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return self._cursor._impl.setinputsizes(*inputsizes)
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# how it's supposed to work
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# return self.await_(self._cursor.setinputsizes(*inputsizes))
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class AsyncAdapt_aioodbc_ss_cursor(
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AsyncAdapt_aioodbc_cursor, AsyncAdapt_dbapi_ss_cursor
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):
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__slots__ = ()
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class AsyncAdapt_aioodbc_connection(AsyncAdapt_dbapi_connection):
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_cursor_cls = AsyncAdapt_aioodbc_cursor
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_ss_cursor_cls = AsyncAdapt_aioodbc_ss_cursor
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__slots__ = ()
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@property
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def autocommit(self):
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return self._connection.autocommit
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@autocommit.setter
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def autocommit(self, value):
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# https://github.com/aio-libs/aioodbc/issues/448
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# self._connection.autocommit = value
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self._connection._conn.autocommit = value
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def cursor(self, server_side=False):
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# aioodbc sets connection=None when closed and just fails with
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# AttributeError here. Here we use the same ProgrammingError +
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# message that pyodbc uses, so it triggers is_disconnect() as well.
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if self._connection.closed:
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raise self.dbapi.ProgrammingError(
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"Attempt to use a closed connection."
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)
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return super().cursor(server_side=server_side)
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def rollback(self):
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# aioodbc sets connection=None when closed and just fails with
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# AttributeError here. should be a no-op
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if not self._connection.closed:
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super().rollback()
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def commit(self):
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# aioodbc sets connection=None when closed and just fails with
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# AttributeError here. should be a no-op
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if not self._connection.closed:
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super().commit()
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def close(self):
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# aioodbc sets connection=None when closed and just fails with
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# AttributeError here. should be a no-op
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if not self._connection.closed:
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super().close()
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class AsyncAdaptFallback_aioodbc_connection(
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AsyncAdaptFallback_dbapi_connection, AsyncAdapt_aioodbc_connection
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):
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__slots__ = ()
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class AsyncAdapt_aioodbc_dbapi:
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def __init__(self, aioodbc, pyodbc):
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self.aioodbc = aioodbc
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self.pyodbc = pyodbc
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self.paramstyle = pyodbc.paramstyle
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self._init_dbapi_attributes()
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self.Cursor = AsyncAdapt_dbapi_cursor
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self.version = pyodbc.version
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def _init_dbapi_attributes(self):
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for name in (
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"Warning",
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"Error",
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"InterfaceError",
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"DataError",
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"DatabaseError",
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"OperationalError",
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"InterfaceError",
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"IntegrityError",
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"ProgrammingError",
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"InternalError",
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"NotSupportedError",
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"NUMBER",
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"STRING",
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"DATETIME",
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"BINARY",
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"Binary",
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"BinaryNull",
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"SQL_VARCHAR",
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"SQL_WVARCHAR",
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):
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setattr(self, name, getattr(self.pyodbc, name))
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def connect(self, *arg, **kw):
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async_fallback = kw.pop("async_fallback", False)
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creator_fn = kw.pop("async_creator_fn", self.aioodbc.connect)
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if util.asbool(async_fallback):
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return AsyncAdaptFallback_aioodbc_connection(
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self,
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await_fallback(creator_fn(*arg, **kw)),
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)
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else:
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return AsyncAdapt_aioodbc_connection(
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self,
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await_only(creator_fn(*arg, **kw)),
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)
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class aiodbcConnector(PyODBCConnector):
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is_async = True
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supports_statement_cache = True
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supports_server_side_cursors = True
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@classmethod
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def import_dbapi(cls):
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return AsyncAdapt_aioodbc_dbapi(
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__import__("aioodbc"), __import__("pyodbc")
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)
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def create_connect_args(self, url: URL) -> ConnectArgsType:
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arg, kw = super().create_connect_args(url)
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if arg and arg[0]:
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kw["dsn"] = arg[0]
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return (), kw
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@classmethod
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def get_pool_class(cls, url):
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async_fallback = url.query.get("async_fallback", False)
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if util.asbool(async_fallback):
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return pool.FallbackAsyncAdaptedQueuePool
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else:
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return pool.AsyncAdaptedQueuePool
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def get_driver_connection(self, connection):
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return connection._connection
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@ -0,0 +1,213 @@
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# connectors/asyncio.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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"""generic asyncio-adapted versions of DBAPI connection and cursor"""
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from __future__ import annotations
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import collections
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from ..engine import AdaptedConnection
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from ..util.concurrency import asyncio
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from ..util.concurrency import await_fallback
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from ..util.concurrency import await_only
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class AsyncAdapt_dbapi_cursor:
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server_side = False
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__slots__ = (
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"_adapt_connection",
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"_connection",
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"await_",
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"_cursor",
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"_rows",
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)
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def __init__(self, adapt_connection):
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self._adapt_connection = adapt_connection
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self._connection = adapt_connection._connection
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self.await_ = adapt_connection.await_
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cursor = self._connection.cursor()
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self._cursor = self._aenter_cursor(cursor)
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if not self.server_side:
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self._rows = collections.deque()
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def _aenter_cursor(self, cursor):
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return self.await_(cursor.__aenter__())
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@property
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def description(self):
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return self._cursor.description
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@property
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def rowcount(self):
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return self._cursor.rowcount
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@property
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def arraysize(self):
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return self._cursor.arraysize
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@arraysize.setter
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def arraysize(self, value):
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self._cursor.arraysize = value
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@property
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def lastrowid(self):
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return self._cursor.lastrowid
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def close(self):
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# note we aren't actually closing the cursor here,
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# we are just letting GC do it. see notes in aiomysql dialect
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self._rows.clear()
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def execute(self, operation, parameters=None):
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return self.await_(self._execute_async(operation, parameters))
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def executemany(self, operation, seq_of_parameters):
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return self.await_(
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self._executemany_async(operation, seq_of_parameters)
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)
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async def _execute_async(self, operation, parameters):
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async with self._adapt_connection._execute_mutex:
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result = await self._cursor.execute(operation, parameters or ())
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if self._cursor.description and not self.server_side:
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self._rows = collections.deque(await self._cursor.fetchall())
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return result
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async def _executemany_async(self, operation, seq_of_parameters):
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async with self._adapt_connection._execute_mutex:
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return await self._cursor.executemany(operation, seq_of_parameters)
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def nextset(self):
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self.await_(self._cursor.nextset())
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if self._cursor.description and not self.server_side:
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self._rows = collections.deque(
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self.await_(self._cursor.fetchall())
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)
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def setinputsizes(self, *inputsizes):
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# NOTE: this is overrridden in aioodbc due to
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# see https://github.com/aio-libs/aioodbc/issues/451
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# right now
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return self.await_(self._cursor.setinputsizes(*inputsizes))
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def __iter__(self):
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while self._rows:
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yield self._rows.popleft()
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def fetchone(self):
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if self._rows:
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return self._rows.popleft()
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else:
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return None
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def fetchmany(self, size=None):
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if size is None:
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size = self.arraysize
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rr = self._rows
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return [rr.popleft() for _ in range(min(size, len(rr)))]
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def fetchall(self):
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retval = list(self._rows)
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self._rows.clear()
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return retval
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class AsyncAdapt_dbapi_ss_cursor(AsyncAdapt_dbapi_cursor):
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__slots__ = ()
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server_side = True
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def __init__(self, adapt_connection):
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self._adapt_connection = adapt_connection
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self._connection = adapt_connection._connection
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self.await_ = adapt_connection.await_
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cursor = self._connection.cursor()
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self._cursor = self.await_(cursor.__aenter__())
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def close(self):
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if self._cursor is not None:
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self.await_(self._cursor.close())
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self._cursor = None
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def fetchone(self):
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return self.await_(self._cursor.fetchone())
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def fetchmany(self, size=None):
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return self.await_(self._cursor.fetchmany(size=size))
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def fetchall(self):
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return self.await_(self._cursor.fetchall())
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def __iter__(self):
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iterator = self._cursor.__aiter__()
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while True:
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try:
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yield self.await_(iterator.__anext__())
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except StopAsyncIteration:
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break
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class AsyncAdapt_dbapi_connection(AdaptedConnection):
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_cursor_cls = AsyncAdapt_dbapi_cursor
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_ss_cursor_cls = AsyncAdapt_dbapi_ss_cursor
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await_ = staticmethod(await_only)
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__slots__ = ("dbapi", "_execute_mutex")
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def __init__(self, dbapi, connection):
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self.dbapi = dbapi
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self._connection = connection
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self._execute_mutex = asyncio.Lock()
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def ping(self, reconnect):
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return self.await_(self._connection.ping(reconnect))
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def add_output_converter(self, *arg, **kw):
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self._connection.add_output_converter(*arg, **kw)
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def character_set_name(self):
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return self._connection.character_set_name()
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@property
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def autocommit(self):
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return self._connection.autocommit
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@autocommit.setter
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def autocommit(self, value):
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# https://github.com/aio-libs/aioodbc/issues/448
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# self._connection.autocommit = value
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self._connection._conn.autocommit = value
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def cursor(self, server_side=False):
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if server_side:
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return self._ss_cursor_cls(self)
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else:
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return self._cursor_cls(self)
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def rollback(self):
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self.await_(self._connection.rollback())
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def commit(self):
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self.await_(self._connection.commit())
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def close(self):
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self.await_(self._connection.close())
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class AsyncAdaptFallback_dbapi_connection(AsyncAdapt_dbapi_connection):
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__slots__ = ()
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await_ = staticmethod(await_fallback)
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@ -0,0 +1,247 @@
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# connectors/pyodbc.py
|
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# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors
|
||||
# <see AUTHORS file>
|
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#
|
||||
# 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
|
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|
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import re
|
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from types import ModuleType
|
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import typing
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from typing import Any
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from typing import Dict
|
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from typing import List
|
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from typing import Optional
|
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from typing import Tuple
|
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from typing import Union
|
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from urllib.parse import unquote_plus
|
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|
||||
from . import Connector
|
||||
from .. import ExecutionContext
|
||||
from .. import pool
|
||||
from .. import util
|
||||
from ..engine import ConnectArgsType
|
||||
from ..engine import Connection
|
||||
from ..engine import interfaces
|
||||
from ..engine import URL
|
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from ..sql.type_api import TypeEngine
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|
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if typing.TYPE_CHECKING:
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from ..engine.interfaces import IsolationLevel
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class PyODBCConnector(Connector):
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driver = "pyodbc"
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|
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# this is no longer False for pyodbc in general
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supports_sane_rowcount_returning = True
|
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supports_sane_multi_rowcount = False
|
||||
|
||||
supports_native_decimal = True
|
||||
default_paramstyle = "named"
|
||||
|
||||
fast_executemany = False
|
||||
|
||||
# for non-DSN connections, this *may* be used to
|
||||
# hold the desired driver name
|
||||
pyodbc_driver_name: Optional[str] = None
|
||||
|
||||
dbapi: ModuleType
|
||||
|
||||
def __init__(self, use_setinputsizes: bool = False, **kw: Any):
|
||||
super().__init__(**kw)
|
||||
if use_setinputsizes:
|
||||
self.bind_typing = interfaces.BindTyping.SETINPUTSIZES
|
||||
|
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@classmethod
|
||||
def import_dbapi(cls) -> ModuleType:
|
||||
return __import__("pyodbc")
|
||||
|
||||
def create_connect_args(self, url: URL) -> ConnectArgsType:
|
||||
opts = url.translate_connect_args(username="user")
|
||||
opts.update(url.query)
|
||||
|
||||
keys = opts
|
||||
|
||||
query = url.query
|
||||
|
||||
connect_args: Dict[str, Any] = {}
|
||||
connectors: List[str]
|
||||
|
||||
for param in ("ansi", "unicode_results", "autocommit"):
|
||||
if param in keys:
|
||||
connect_args[param] = util.asbool(keys.pop(param))
|
||||
|
||||
if "odbc_connect" in keys:
|
||||
connectors = [unquote_plus(keys.pop("odbc_connect"))]
|
||||
else:
|
||||
|
||||
def check_quote(token: str) -> str:
|
||||
if ";" in str(token) or str(token).startswith("{"):
|
||||
token = "{%s}" % token.replace("}", "}}")
|
||||
return token
|
||||
|
||||
keys = {k: check_quote(v) for k, v in keys.items()}
|
||||
|
||||
dsn_connection = "dsn" in keys or (
|
||||
"host" in keys and "database" not in keys
|
||||
)
|
||||
if dsn_connection:
|
||||
connectors = [
|
||||
"dsn=%s" % (keys.pop("host", "") or keys.pop("dsn", ""))
|
||||
]
|
||||
else:
|
||||
port = ""
|
||||
if "port" in keys and "port" not in query:
|
||||
port = ",%d" % int(keys.pop("port"))
|
||||
|
||||
connectors = []
|
||||
driver = keys.pop("driver", self.pyodbc_driver_name)
|
||||
if driver is None and keys:
|
||||
# note if keys is empty, this is a totally blank URL
|
||||
util.warn(
|
||||
"No driver name specified; "
|
||||
"this is expected by PyODBC when using "
|
||||
"DSN-less connections"
|
||||
)
|
||||
else:
|
||||
connectors.append("DRIVER={%s}" % driver)
|
||||
|
||||
connectors.extend(
|
||||
[
|
||||
"Server=%s%s" % (keys.pop("host", ""), port),
|
||||
"Database=%s" % keys.pop("database", ""),
|
||||
]
|
||||
)
|
||||
|
||||
user = keys.pop("user", None)
|
||||
if user:
|
||||
connectors.append("UID=%s" % user)
|
||||
pwd = keys.pop("password", "")
|
||||
if pwd:
|
||||
connectors.append("PWD=%s" % pwd)
|
||||
else:
|
||||
authentication = keys.pop("authentication", None)
|
||||
if authentication:
|
||||
connectors.append("Authentication=%s" % authentication)
|
||||
else:
|
||||
connectors.append("Trusted_Connection=Yes")
|
||||
|
||||
# if set to 'Yes', the ODBC layer will try to automagically
|
||||
# convert textual data from your database encoding to your
|
||||
# client encoding. This should obviously be set to 'No' if
|
||||
# you query a cp1253 encoded database from a latin1 client...
|
||||
if "odbc_autotranslate" in keys:
|
||||
connectors.append(
|
||||
"AutoTranslate=%s" % keys.pop("odbc_autotranslate")
|
||||
)
|
||||
|
||||
connectors.extend(["%s=%s" % (k, v) for k, v in keys.items()])
|
||||
|
||||
return ((";".join(connectors),), connect_args)
|
||||
|
||||
def is_disconnect(
|
||||
self,
|
||||
e: Exception,
|
||||
connection: Optional[
|
||||
Union[pool.PoolProxiedConnection, interfaces.DBAPIConnection]
|
||||
],
|
||||
cursor: Optional[interfaces.DBAPICursor],
|
||||
) -> bool:
|
||||
if isinstance(e, self.dbapi.ProgrammingError):
|
||||
return "The cursor's connection has been closed." in str(
|
||||
e
|
||||
) or "Attempt to use a closed connection." in str(e)
|
||||
else:
|
||||
return False
|
||||
|
||||
def _dbapi_version(self) -> interfaces.VersionInfoType:
|
||||
if not self.dbapi:
|
||||
return ()
|
||||
return self._parse_dbapi_version(self.dbapi.version)
|
||||
|
||||
def _parse_dbapi_version(self, vers: str) -> interfaces.VersionInfoType:
|
||||
m = re.match(r"(?:py.*-)?([\d\.]+)(?:-(\w+))?", vers)
|
||||
if not m:
|
||||
return ()
|
||||
vers_tuple: interfaces.VersionInfoType = tuple(
|
||||
[int(x) for x in m.group(1).split(".")]
|
||||
)
|
||||
if m.group(2):
|
||||
vers_tuple += (m.group(2),)
|
||||
return vers_tuple
|
||||
|
||||
def _get_server_version_info(
|
||||
self, connection: Connection
|
||||
) -> interfaces.VersionInfoType:
|
||||
# NOTE: this function is not reliable, particularly when
|
||||
# freetds is in use. Implement database-specific server version
|
||||
# queries.
|
||||
dbapi_con = connection.connection.dbapi_connection
|
||||
version: Tuple[Union[int, str], ...] = ()
|
||||
r = re.compile(r"[.\-]")
|
||||
for n in r.split(dbapi_con.getinfo(self.dbapi.SQL_DBMS_VER)): # type: ignore[union-attr] # noqa: E501
|
||||
try:
|
||||
version += (int(n),)
|
||||
except ValueError:
|
||||
pass
|
||||
return tuple(version)
|
||||
|
||||
def do_set_input_sizes(
|
||||
self,
|
||||
cursor: interfaces.DBAPICursor,
|
||||
list_of_tuples: List[Tuple[str, Any, TypeEngine[Any]]],
|
||||
context: ExecutionContext,
|
||||
) -> None:
|
||||
# the rules for these types seems a little strange, as you can pass
|
||||
# non-tuples as well as tuples, however it seems to assume "0"
|
||||
# for the subsequent values if you don't pass a tuple which fails
|
||||
# for types such as pyodbc.SQL_WLONGVARCHAR, which is the datatype
|
||||
# that ticket #5649 is targeting.
|
||||
|
||||
# NOTE: as of #6058, this won't be called if the use_setinputsizes
|
||||
# parameter were not passed to the dialect, or if no types were
|
||||
# specified in list_of_tuples
|
||||
|
||||
# as of #8177 for 2.0 we assume use_setinputsizes=True and only
|
||||
# omit the setinputsizes calls for .executemany() with
|
||||
# fast_executemany=True
|
||||
|
||||
if (
|
||||
context.execute_style is interfaces.ExecuteStyle.EXECUTEMANY
|
||||
and self.fast_executemany
|
||||
):
|
||||
return
|
||||
|
||||
cursor.setinputsizes(
|
||||
[
|
||||
(
|
||||
(dbtype, None, None)
|
||||
if not isinstance(dbtype, tuple)
|
||||
else dbtype
|
||||
)
|
||||
for key, dbtype, sqltype in list_of_tuples
|
||||
]
|
||||
)
|
||||
|
||||
def get_isolation_level_values(
|
||||
self, dbapi_conn: interfaces.DBAPIConnection
|
||||
) -> List[IsolationLevel]:
|
||||
return [*super().get_isolation_level_values(dbapi_conn), "AUTOCOMMIT"]
|
||||
|
||||
def set_isolation_level(
|
||||
self,
|
||||
dbapi_connection: interfaces.DBAPIConnection,
|
||||
level: IsolationLevel,
|
||||
) -> None:
|
||||
# adjust for ConnectionFairy being present
|
||||
# allows attribute set e.g. "connection.autocommit = True"
|
||||
# to work properly
|
||||
|
||||
if level == "AUTOCOMMIT":
|
||||
dbapi_connection.autocommit = True
|
||||
else:
|
||||
dbapi_connection.autocommit = False
|
||||
super().set_isolation_level(dbapi_connection, level)
|
||||
Reference in New Issue
Block a user