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authorxiubuzhe <xiubuzhe@sina.com>2023-10-08 20:59:00 +0800
committerxiubuzhe <xiubuzhe@sina.com>2023-10-08 20:59:00 +0800
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+# mssql/pyodbc.py
+# Copyright (C) 2005-2022 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
+r"""
+.. dialect:: mssql+pyodbc
+ :name: PyODBC
+ :dbapi: pyodbc
+ :connectstring: mssql+pyodbc://<username>:<password>@<dsnname>
+ :url: https://pypi.org/project/pyodbc/
+
+Connecting to PyODBC
+--------------------
+
+The URL here is to be translated to PyODBC connection strings, as
+detailed in `ConnectionStrings <https://code.google.com/p/pyodbc/wiki/ConnectionStrings>`_.
+
+DSN Connections
+^^^^^^^^^^^^^^^
+
+A DSN connection in ODBC means that a pre-existing ODBC datasource is
+configured on the client machine. The application then specifies the name
+of this datasource, which encompasses details such as the specific ODBC driver
+in use as well as the network address of the database. Assuming a datasource
+is configured on the client, a basic DSN-based connection looks like::
+
+ engine = create_engine("mssql+pyodbc://scott:tiger@some_dsn")
+
+Which above, will pass the following connection string to PyODBC::
+
+ DSN=some_dsn;UID=scott;PWD=tiger
+
+If the username and password are omitted, the DSN form will also add
+the ``Trusted_Connection=yes`` directive to the ODBC string.
+
+Hostname Connections
+^^^^^^^^^^^^^^^^^^^^
+
+Hostname-based connections are also supported by pyodbc. These are often
+easier to use than a DSN and have the additional advantage that the specific
+database name to connect towards may be specified locally in the URL, rather
+than it being fixed as part of a datasource configuration.
+
+When using a hostname connection, the driver name must also be specified in the
+query parameters of the URL. As these names usually have spaces in them, the
+name must be URL encoded which means using plus signs for spaces::
+
+ engine = create_engine("mssql+pyodbc://scott:tiger@myhost:port/databasename?driver=ODBC+Driver+17+for+SQL+Server")
+
+Other keywords interpreted by the Pyodbc dialect to be passed to
+``pyodbc.connect()`` in both the DSN and hostname cases include:
+``odbc_autotranslate``, ``ansi``, ``unicode_results``, ``autocommit``,
+``authentication``.
+Note that in order for the dialect to recognize these keywords
+(including the ``driver`` keyword above) they must be all lowercase.
+Multiple additional keyword arguments must be separated by an
+ampersand (``&``), not a semicolon::
+
+ engine = create_engine(
+ "mssql+pyodbc://scott:tiger@myhost:49242/databasename"
+ "?driver=ODBC+Driver+17+for+SQL+Server"
+ "&authentication=ActiveDirectoryIntegrated"
+ )
+
+The equivalent URL can be constructed using :class:`_sa.engine.URL`::
+
+ from sqlalchemy.engine import URL
+ connection_url = URL.create(
+ "mssql+pyodbc",
+ username="scott",
+ password="tiger",
+ host="myhost",
+ port=49242,
+ database="databasename",
+ query={
+ "driver": "ODBC Driver 17 for SQL Server",
+ "authentication": "ActiveDirectoryIntegrated",
+ },
+ )
+
+
+Pass through exact Pyodbc string
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A PyODBC connection string can also be sent in pyodbc's format directly, as
+specified in `the PyODBC documentation
+<https://github.com/mkleehammer/pyodbc/wiki/Connecting-to-databases>`_,
+using the parameter ``odbc_connect``. A :class:`_sa.engine.URL` object
+can help make this easier::
+
+ from sqlalchemy.engine import URL
+ connection_string = "DRIVER={SQL Server Native Client 10.0};SERVER=dagger;DATABASE=test;UID=user;PWD=password"
+ connection_url = URL.create("mssql+pyodbc", query={"odbc_connect": connection_string})
+
+ engine = create_engine(connection_url)
+
+.. _mssql_pyodbc_access_tokens:
+
+Connecting to databases with access tokens
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Some database servers are set up to only accept access tokens for login. For
+example, SQL Server allows the use of Azure Active Directory tokens to connect
+to databases. This requires creating a credential object using the
+``azure-identity`` library. More information about the authentication step can be
+found in `Microsoft's documentation
+<https://docs.microsoft.com/en-us/azure/developer/python/azure-sdk-authenticate?tabs=bash>`_.
+
+After getting an engine, the credentials need to be sent to ``pyodbc.connect``
+each time a connection is requested. One way to do this is to set up an event
+listener on the engine that adds the credential token to the dialect's connect
+call. This is discussed more generally in :ref:`engines_dynamic_tokens`. For
+SQL Server in particular, this is passed as an ODBC connection attribute with
+a data structure `described by Microsoft
+<https://docs.microsoft.com/en-us/sql/connect/odbc/using-azure-active-directory#authenticating-with-an-access-token>`_.
+
+The following code snippet will create an engine that connects to an Azure SQL
+database using Azure credentials::
+
+ import struct
+ from sqlalchemy import create_engine, event
+ from sqlalchemy.engine.url import URL
+ from azure import identity
+
+ SQL_COPT_SS_ACCESS_TOKEN = 1256 # Connection option for access tokens, as defined in msodbcsql.h
+ TOKEN_URL = "https://database.windows.net/" # The token URL for any Azure SQL database
+
+ connection_string = "mssql+pyodbc://@my-server.database.windows.net/myDb?driver=ODBC+Driver+17+for+SQL+Server"
+
+ engine = create_engine(connection_string)
+
+ azure_credentials = identity.DefaultAzureCredential()
+
+ @event.listens_for(engine, "do_connect")
+ def provide_token(dialect, conn_rec, cargs, cparams):
+ # remove the "Trusted_Connection" parameter that SQLAlchemy adds
+ cargs[0] = cargs[0].replace(";Trusted_Connection=Yes", "")
+
+ # create token credential
+ raw_token = azure_credentials.get_token(TOKEN_URL).token.encode("utf-16-le")
+ token_struct = struct.pack(f"<I{len(raw_token)}s", len(raw_token), raw_token)
+
+ # apply it to keyword arguments
+ cparams["attrs_before"] = {SQL_COPT_SS_ACCESS_TOKEN: token_struct}
+
+.. tip::
+
+ The ``Trusted_Connection`` token is currently added by the SQLAlchemy
+ pyodbc dialect when no username or password is present. This needs
+ to be removed per Microsoft's
+ `documentation for Azure access tokens
+ <https://docs.microsoft.com/en-us/sql/connect/odbc/using-azure-active-directory#authenticating-with-an-access-token>`_,
+ stating that a connection string when using an access token must not contain
+ ``UID``, ``PWD``, ``Authentication`` or ``Trusted_Connection`` parameters.
+
+.. _azure_synapse_ignore_no_transaction_on_rollback:
+
+Avoiding transaction-related exceptions on Azure Synapse Analytics
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Azure Synapse Analytics has a significant difference in its transaction
+handling compared to plain SQL Server; in some cases an error within a Synapse
+transaction can cause it to be arbitrarily terminated on the server side, which
+then causes the DBAPI ``.rollback()`` method (as well as ``.commit()``) to
+fail. The issue prevents the usual DBAPI contract of allowing ``.rollback()``
+to pass silently if no transaction is present as the driver does not expect
+this condition. The symptom of this failure is an exception with a message
+resembling 'No corresponding transaction found. (111214)' when attempting to
+emit a ``.rollback()`` after an operation had a failure of some kind.
+
+This specific case can be handled by passing ``ignore_no_transaction_on_rollback=True`` to
+the SQL Server dialect via the :func:`_sa.create_engine` function as follows::
+
+ engine = create_engine(connection_url, ignore_no_transaction_on_rollback=True)
+
+Using the above parameter, the dialect will catch ``ProgrammingError``
+exceptions raised during ``connection.rollback()`` and emit a warning
+if the error message contains code ``111214``, however will not raise
+an exception.
+
+.. versionadded:: 1.4.40 Added the
+ ``ignore_no_transaction_on_rollback=True`` parameter.
+
+Enable autocommit for Azure SQL Data Warehouse (DW) connections
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Azure SQL Data Warehouse does not support transactions,
+and that can cause problems with SQLAlchemy's "autobegin" (and implicit
+commit/rollback) behavior. We can avoid these problems by enabling autocommit
+at both the pyodbc and engine levels::
+
+ connection_url = sa.engine.URL.create(
+ "mssql+pyodbc",
+ username="scott",
+ password="tiger",
+ host="dw.azure.example.com",
+ database="mydb",
+ query={
+ "driver": "ODBC Driver 17 for SQL Server",
+ "autocommit": "True",
+ },
+ )
+
+ engine = create_engine(connection_url).execution_options(
+ isolation_level="AUTOCOMMIT"
+ )
+
+Avoiding sending large string parameters as TEXT/NTEXT
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+By default, for historical reasons, Microsoft's ODBC drivers for SQL Server
+send long string parameters (greater than 4000 SBCS characters or 2000 Unicode
+characters) as TEXT/NTEXT values. TEXT and NTEXT have been deprecated for many
+years and are starting to cause compatibility issues with newer versions of
+SQL_Server/Azure. For example, see `this
+issue <https://github.com/mkleehammer/pyodbc/issues/835>`_.
+
+Starting with ODBC Driver 18 for SQL Server we can override the legacy
+behavior and pass long strings as varchar(max)/nvarchar(max) using the
+``LongAsMax=Yes`` connection string parameter::
+
+ connection_url = sa.engine.URL.create(
+ "mssql+pyodbc",
+ username="scott",
+ password="tiger",
+ host="mssqlserver.example.com",
+ database="mydb",
+ query={
+ "driver": "ODBC Driver 18 for SQL Server",
+ "LongAsMax": "Yes",
+ },
+ )
+
+
+Pyodbc Pooling / connection close behavior
+------------------------------------------
+
+PyODBC uses internal `pooling
+<https://github.com/mkleehammer/pyodbc/wiki/The-pyodbc-Module#pooling>`_ by
+default, which means connections will be longer lived than they are within
+SQLAlchemy itself. As SQLAlchemy has its own pooling behavior, it is often
+preferable to disable this behavior. This behavior can only be disabled
+globally at the PyODBC module level, **before** any connections are made::
+
+ import pyodbc
+
+ pyodbc.pooling = False
+
+ # don't use the engine before pooling is set to False
+ engine = create_engine("mssql+pyodbc://user:pass@dsn")
+
+If this variable is left at its default value of ``True``, **the application
+will continue to maintain active database connections**, even when the
+SQLAlchemy engine itself fully discards a connection or if the engine is
+disposed.
+
+.. seealso::
+
+ `pooling <https://github.com/mkleehammer/pyodbc/wiki/The-pyodbc-Module#pooling>`_ -
+ in the PyODBC documentation.
+
+Driver / Unicode Support
+-------------------------
+
+PyODBC works best with Microsoft ODBC drivers, particularly in the area
+of Unicode support on both Python 2 and Python 3.
+
+Using the FreeTDS ODBC drivers on Linux or OSX with PyODBC is **not**
+recommended; there have been historically many Unicode-related issues
+in this area, including before Microsoft offered ODBC drivers for Linux
+and OSX. Now that Microsoft offers drivers for all platforms, for
+PyODBC support these are recommended. FreeTDS remains relevant for
+non-ODBC drivers such as pymssql where it works very well.
+
+
+Rowcount Support
+----------------
+
+Pyodbc only has partial support for rowcount. See the notes at
+:ref:`mssql_rowcount_versioning` for important notes when using ORM
+versioning.
+
+.. _mssql_pyodbc_fastexecutemany:
+
+Fast Executemany Mode
+---------------------
+
+The Pyodbc driver has added support for a "fast executemany" mode of execution
+which greatly reduces round trips for a DBAPI ``executemany()`` call when using
+Microsoft ODBC drivers, for **limited size batches that fit in memory**. The
+feature is enabled by setting the flag ``.fast_executemany`` on the DBAPI
+cursor when an executemany call is to be used. The SQLAlchemy pyodbc SQL
+Server dialect supports setting this flag automatically when the
+``.fast_executemany`` flag is passed to
+:func:`_sa.create_engine` ; note that the ODBC driver must be the Microsoft
+driver in order to use this flag::
+
+ engine = create_engine(
+ "mssql+pyodbc://scott:tiger@mssql2017:1433/test?driver=ODBC+Driver+13+for+SQL+Server",
+ fast_executemany=True)
+
+.. warning:: The pyodbc fast_executemany mode **buffers all rows in memory** and is
+ not compatible with very large batches of data. A future version of SQLAlchemy
+ may support this flag as a per-execution option instead.
+
+.. versionadded:: 1.3
+
+.. seealso::
+
+ `fast executemany <https://github.com/mkleehammer/pyodbc/wiki/Features-beyond-the-DB-API#fast_executemany>`_
+ - on github
+
+.. _mssql_pyodbc_setinputsizes:
+
+Setinputsizes Support
+-----------------------
+
+The pyodbc ``cursor.setinputsizes()`` method can be used if necessary. To
+enable this hook, pass ``use_setinputsizes=True`` to :func:`_sa.create_engine`::
+
+ engine = create_engine("mssql+pyodbc://...", use_setinputsizes=True)
+
+The behavior of the hook can then be customized, as may be necessary
+particularly if fast_executemany is in use, via the
+:meth:`.DialectEvents.do_setinputsizes` hook. See that method for usage
+examples.
+
+.. versionchanged:: 1.4.1 The pyodbc dialects will not use setinputsizes
+ unless ``use_setinputsizes=True`` is passed.
+
+""" # noqa
+
+
+import datetime
+import decimal
+import re
+import struct
+
+from .base import BINARY
+from .base import DATETIMEOFFSET
+from .base import MSDialect
+from .base import MSExecutionContext
+from .base import VARBINARY
+from ... import exc
+from ... import types as sqltypes
+from ... import util
+from ...connectors.pyodbc import PyODBCConnector
+
+
+class _ms_numeric_pyodbc(object):
+
+ """Turns Decimals with adjusted() < 0 or > 7 into strings.
+
+ The routines here are needed for older pyodbc versions
+ as well as current mxODBC versions.
+
+ """
+
+ def bind_processor(self, dialect):
+
+ super_process = super(_ms_numeric_pyodbc, self).bind_processor(dialect)
+
+ if not dialect._need_decimal_fix:
+ return super_process
+
+ def process(value):
+ if self.asdecimal and isinstance(value, decimal.Decimal):
+ adjusted = value.adjusted()
+ if adjusted < 0:
+ return self._small_dec_to_string(value)
+ elif adjusted > 7:
+ return self._large_dec_to_string(value)
+
+ if super_process:
+ return super_process(value)
+ else:
+ return value
+
+ return process
+
+ # these routines needed for older versions of pyodbc.
+ # as of 2.1.8 this logic is integrated.
+
+ def _small_dec_to_string(self, value):
+ return "%s0.%s%s" % (
+ (value < 0 and "-" or ""),
+ "0" * (abs(value.adjusted()) - 1),
+ "".join([str(nint) for nint in value.as_tuple()[1]]),
+ )
+
+ def _large_dec_to_string(self, value):
+ _int = value.as_tuple()[1]
+ if "E" in str(value):
+ result = "%s%s%s" % (
+ (value < 0 and "-" or ""),
+ "".join([str(s) for s in _int]),
+ "0" * (value.adjusted() - (len(_int) - 1)),
+ )
+ else:
+ if (len(_int) - 1) > value.adjusted():
+ result = "%s%s.%s" % (
+ (value < 0 and "-" or ""),
+ "".join([str(s) for s in _int][0 : value.adjusted() + 1]),
+ "".join([str(s) for s in _int][value.adjusted() + 1 :]),
+ )
+ else:
+ result = "%s%s" % (
+ (value < 0 and "-" or ""),
+ "".join([str(s) for s in _int][0 : value.adjusted() + 1]),
+ )
+ return result
+
+
+class _MSNumeric_pyodbc(_ms_numeric_pyodbc, sqltypes.Numeric):
+ pass
+
+
+class _MSFloat_pyodbc(_ms_numeric_pyodbc, sqltypes.Float):
+ pass
+
+
+class _ms_binary_pyodbc(object):
+ """Wraps binary values in dialect-specific Binary wrapper.
+ If the value is null, return a pyodbc-specific BinaryNull
+ object to prevent pyODBC [and FreeTDS] from defaulting binary
+ NULL types to SQLWCHAR and causing implicit conversion errors.
+ """
+
+ def bind_processor(self, dialect):
+ if dialect.dbapi is None:
+ return None
+
+ DBAPIBinary = dialect.dbapi.Binary
+
+ def process(value):
+ if value is not None:
+ return DBAPIBinary(value)
+ else:
+ # pyodbc-specific
+ return dialect.dbapi.BinaryNull
+
+ return process
+
+
+class _ODBCDateTimeBindProcessor(object):
+ """Add bind processors to handle datetimeoffset behaviors"""
+
+ has_tz = False
+
+ def bind_processor(self, dialect):
+ def process(value):
+ if value is None:
+ return None
+ elif isinstance(value, util.string_types):
+ # if a string was passed directly, allow it through
+ return value
+ elif not value.tzinfo or (not self.timezone and not self.has_tz):
+ # for DateTime(timezone=False)
+ return value
+ else:
+ # for DATETIMEOFFSET or DateTime(timezone=True)
+ #
+ # Convert to string format required by T-SQL
+ dto_string = value.strftime("%Y-%m-%d %H:%M:%S.%f %z")
+ # offset needs a colon, e.g., -0700 -> -07:00
+ # "UTC offset in the form (+-)HHMM[SS[.ffffff]]"
+ # backend currently rejects seconds / fractional seconds
+ dto_string = re.sub(
+ r"([\+\-]\d{2})([\d\.]+)$", r"\1:\2", dto_string
+ )
+ return dto_string
+
+ return process
+
+
+class _ODBCDateTime(_ODBCDateTimeBindProcessor, sqltypes.DateTime):
+ pass
+
+
+class _ODBCDATETIMEOFFSET(_ODBCDateTimeBindProcessor, DATETIMEOFFSET):
+ has_tz = True
+
+
+class _VARBINARY_pyodbc(_ms_binary_pyodbc, VARBINARY):
+ pass
+
+
+class _BINARY_pyodbc(_ms_binary_pyodbc, BINARY):
+ pass
+
+
+class MSExecutionContext_pyodbc(MSExecutionContext):
+ _embedded_scope_identity = False
+
+ def pre_exec(self):
+ """where appropriate, issue "select scope_identity()" in the same
+ statement.
+
+ Background on why "scope_identity()" is preferable to "@@identity":
+ https://msdn.microsoft.com/en-us/library/ms190315.aspx
+
+ Background on why we attempt to embed "scope_identity()" into the same
+ statement as the INSERT:
+ https://code.google.com/p/pyodbc/wiki/FAQs#How_do_I_retrieve_autogenerated/identity_values?
+
+ """
+
+ super(MSExecutionContext_pyodbc, self).pre_exec()
+
+ # don't embed the scope_identity select into an
+ # "INSERT .. DEFAULT VALUES"
+ if (
+ self._select_lastrowid
+ and self.dialect.use_scope_identity
+ and len(self.parameters[0])
+ ):
+ self._embedded_scope_identity = True
+
+ self.statement += "; select scope_identity()"
+
+ def post_exec(self):
+ if self._embedded_scope_identity:
+ # Fetch the last inserted id from the manipulated statement
+ # We may have to skip over a number of result sets with
+ # no data (due to triggers, etc.)
+ while True:
+ try:
+ # fetchall() ensures the cursor is consumed
+ # without closing it (FreeTDS particularly)
+ row = self.cursor.fetchall()[0]
+ break
+ except self.dialect.dbapi.Error:
+ # no way around this - nextset() consumes the previous set
+ # so we need to just keep flipping
+ self.cursor.nextset()
+
+ self._lastrowid = int(row[0])
+ else:
+ super(MSExecutionContext_pyodbc, self).post_exec()
+
+
+class MSDialect_pyodbc(PyODBCConnector, MSDialect):
+ supports_statement_cache = True
+
+ # mssql still has problems with this on Linux
+ supports_sane_rowcount_returning = False
+
+ execution_ctx_cls = MSExecutionContext_pyodbc
+
+ colspecs = util.update_copy(
+ MSDialect.colspecs,
+ {
+ sqltypes.Numeric: _MSNumeric_pyodbc,
+ sqltypes.Float: _MSFloat_pyodbc,
+ BINARY: _BINARY_pyodbc,
+ # support DateTime(timezone=True)
+ sqltypes.DateTime: _ODBCDateTime,
+ DATETIMEOFFSET: _ODBCDATETIMEOFFSET,
+ # SQL Server dialect has a VARBINARY that is just to support
+ # "deprecate_large_types" w/ VARBINARY(max), but also we must
+ # handle the usual SQL standard VARBINARY
+ VARBINARY: _VARBINARY_pyodbc,
+ sqltypes.VARBINARY: _VARBINARY_pyodbc,
+ sqltypes.LargeBinary: _VARBINARY_pyodbc,
+ },
+ )
+
+ def __init__(
+ self, description_encoding=None, fast_executemany=False, **params
+ ):
+ if "description_encoding" in params:
+ self.description_encoding = params.pop("description_encoding")
+ super(MSDialect_pyodbc, self).__init__(**params)
+ self.use_scope_identity = (
+ self.use_scope_identity
+ and self.dbapi
+ and hasattr(self.dbapi.Cursor, "nextset")
+ )
+ self._need_decimal_fix = self.dbapi and self._dbapi_version() < (
+ 2,
+ 1,
+ 8,
+ )
+ self.fast_executemany = fast_executemany
+
+ def _get_server_version_info(self, connection):
+ try:
+ # "Version of the instance of SQL Server, in the form
+ # of 'major.minor.build.revision'"
+ raw = connection.exec_driver_sql(
+ "SELECT CAST(SERVERPROPERTY('ProductVersion') AS VARCHAR)"
+ ).scalar()
+ except exc.DBAPIError:
+ # SQL Server docs indicate this function isn't present prior to
+ # 2008. Before we had the VARCHAR cast above, pyodbc would also
+ # fail on this query.
+ return super(MSDialect_pyodbc, self)._get_server_version_info(
+ connection, allow_chars=False
+ )
+ else:
+ version = []
+ r = re.compile(r"[.\-]")
+ for n in r.split(raw):
+ try:
+ version.append(int(n))
+ except ValueError:
+ pass
+ return tuple(version)
+
+ def on_connect(self):
+ super_ = super(MSDialect_pyodbc, self).on_connect()
+
+ def on_connect(conn):
+ if super_ is not None:
+ super_(conn)
+
+ self._setup_timestampoffset_type(conn)
+
+ return on_connect
+
+ def _setup_timestampoffset_type(self, connection):
+ # output converter function for datetimeoffset
+ def _handle_datetimeoffset(dto_value):
+ tup = struct.unpack("<6hI2h", dto_value)
+ return datetime.datetime(
+ tup[0],
+ tup[1],
+ tup[2],
+ tup[3],
+ tup[4],
+ tup[5],
+ tup[6] // 1000,
+ util.timezone(
+ datetime.timedelta(hours=tup[7], minutes=tup[8])
+ ),
+ )
+
+ odbc_SQL_SS_TIMESTAMPOFFSET = -155 # as defined in SQLNCLI.h
+ connection.add_output_converter(
+ odbc_SQL_SS_TIMESTAMPOFFSET, _handle_datetimeoffset
+ )
+
+ def do_executemany(self, cursor, statement, parameters, context=None):
+ if self.fast_executemany:
+ cursor.fast_executemany = True
+ super(MSDialect_pyodbc, self).do_executemany(
+ cursor, statement, parameters, context=context
+ )
+
+ def is_disconnect(self, e, connection, cursor):
+ if isinstance(e, self.dbapi.Error):
+ code = e.args[0]
+ if code in {
+ "08S01",
+ "01000",
+ "01002",
+ "08003",
+ "08007",
+ "08S02",
+ "08001",
+ "HYT00",
+ "HY010",
+ "10054",
+ }:
+ return True
+ return super(MSDialect_pyodbc, self).is_disconnect(
+ e, connection, cursor
+ )
+
+
+dialect = MSDialect_pyodbc