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Diffstat (limited to 'venv/lib/python3.11/site-packages/sqlalchemy/connectors/pyodbc.py')
| -rw-r--r-- | venv/lib/python3.11/site-packages/sqlalchemy/connectors/pyodbc.py | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/venv/lib/python3.11/site-packages/sqlalchemy/connectors/pyodbc.py b/venv/lib/python3.11/site-packages/sqlalchemy/connectors/pyodbc.py new file mode 100644 index 0000000..f204d80 --- /dev/null +++ b/venv/lib/python3.11/site-packages/sqlalchemy/connectors/pyodbc.py @@ -0,0 +1,249 @@ +# connectors/pyodbc.py +# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors +# <see AUTHORS file> +# +# This module is part of SQLAlchemy and is released under +# the MIT License: https://www.opensource.org/licenses/mit-license.php + +from __future__ import annotations + +import re +from types import ModuleType +import typing +from typing import Any +from typing import Dict +from typing import List +from typing import Optional +from typing import Tuple +from typing import Union +from urllib.parse import unquote_plus + +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 +from ..sql.type_api import TypeEngine + +if typing.TYPE_CHECKING: + from ..engine.interfaces import IsolationLevel + + +class PyODBCConnector(Connector): + driver = "pyodbc" + + # this is no longer False for pyodbc in general + supports_sane_rowcount_returning = True + 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 + + @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_connection: interfaces.DBAPIConnection + ) -> List[IsolationLevel]: + return super().get_isolation_level_values(dbapi_connection) + [ + "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) |