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authorcyfraeviolae <cyfraeviolae>2024-04-03 03:10:44 -0400
committercyfraeviolae <cyfraeviolae>2024-04-03 03:10:44 -0400
commit6d7ba58f880be618ade07f8ea080fe8c4bf8a896 (patch)
treeb1c931051ffcebd2bd9d61d98d6233ffa289bbce /venv/lib/python3.11/site-packages/sqlalchemy/dialects/mssql/pymssql.py
parent4f884c9abc32990b4061a1bb6997b4b37e58ea0b (diff)
venv
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+# dialects/mssql/pymssql.py
+# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: https://www.opensource.org/licenses/mit-license.php
+# mypy: ignore-errors
+
+
+"""
+.. dialect:: mssql+pymssql
+ :name: pymssql
+ :dbapi: pymssql
+ :connectstring: mssql+pymssql://<username>:<password>@<freetds_name>/?charset=utf8
+
+pymssql is a Python module that provides a Python DBAPI interface around
+`FreeTDS <https://www.freetds.org/>`_.
+
+.. versionchanged:: 2.0.5
+
+ pymssql was restored to SQLAlchemy's continuous integration testing
+
+
+""" # noqa
+import re
+
+from .base import MSDialect
+from .base import MSIdentifierPreparer
+from ... import types as sqltypes
+from ... import util
+from ...engine import processors
+
+
+class _MSNumeric_pymssql(sqltypes.Numeric):
+ def result_processor(self, dialect, type_):
+ if not self.asdecimal:
+ return processors.to_float
+ else:
+ return sqltypes.Numeric.result_processor(self, dialect, type_)
+
+
+class MSIdentifierPreparer_pymssql(MSIdentifierPreparer):
+ def __init__(self, dialect):
+ super().__init__(dialect)
+ # pymssql has the very unusual behavior that it uses pyformat
+ # yet does not require that percent signs be doubled
+ self._double_percents = False
+
+
+class MSDialect_pymssql(MSDialect):
+ supports_statement_cache = True
+ supports_native_decimal = True
+ supports_native_uuid = True
+ driver = "pymssql"
+
+ preparer = MSIdentifierPreparer_pymssql
+
+ colspecs = util.update_copy(
+ MSDialect.colspecs,
+ {sqltypes.Numeric: _MSNumeric_pymssql, sqltypes.Float: sqltypes.Float},
+ )
+
+ @classmethod
+ def import_dbapi(cls):
+ module = __import__("pymssql")
+ # pymmsql < 2.1.1 doesn't have a Binary method. we use string
+ client_ver = tuple(int(x) for x in module.__version__.split("."))
+ if client_ver < (2, 1, 1):
+ # TODO: monkeypatching here is less than ideal
+ module.Binary = lambda x: x if hasattr(x, "decode") else str(x)
+
+ if client_ver < (1,):
+ util.warn(
+ "The pymssql dialect expects at least "
+ "the 1.0 series of the pymssql DBAPI."
+ )
+ return module
+
+ def _get_server_version_info(self, connection):
+ vers = connection.exec_driver_sql("select @@version").scalar()
+ m = re.match(r"Microsoft .*? - (\d+)\.(\d+)\.(\d+)\.(\d+)", vers)
+ if m:
+ return tuple(int(x) for x in m.group(1, 2, 3, 4))
+ else:
+ return None
+
+ def create_connect_args(self, url):
+ opts = url.translate_connect_args(username="user")
+ opts.update(url.query)
+ port = opts.pop("port", None)
+ if port and "host" in opts:
+ opts["host"] = "%s:%s" % (opts["host"], port)
+ return ([], opts)
+
+ def is_disconnect(self, e, connection, cursor):
+ for msg in (
+ "Adaptive Server connection timed out",
+ "Net-Lib error during Connection reset by peer",
+ "message 20003", # connection timeout
+ "Error 10054",
+ "Not connected to any MS SQL server",
+ "Connection is closed",
+ "message 20006", # Write to the server failed
+ "message 20017", # Unexpected EOF from the server
+ "message 20047", # DBPROCESS is dead or not enabled
+ ):
+ if msg in str(e):
+ return True
+ else:
+ return False
+
+ def get_isolation_level_values(self, dbapi_connection):
+ return super().get_isolation_level_values(dbapi_connection) + [
+ "AUTOCOMMIT"
+ ]
+
+ def set_isolation_level(self, dbapi_connection, level):
+ if level == "AUTOCOMMIT":
+ dbapi_connection.autocommit(True)
+ else:
+ dbapi_connection.autocommit(False)
+ super().set_isolation_level(dbapi_connection, level)
+
+
+dialect = MSDialect_pymssql