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# connectors/pyodbc.py # Copyright (C) 2005-2020 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: http://www.opensource.org/licenses/mit-license.php import re from . import Connector from .. import util class PyODBCConnector(Connector): driver = "pyodbc" supports_sane_rowcount_returning = False supports_sane_multi_rowcount = False supports_unicode_statements = True supports_unicode_binds = True supports_native_decimal = True default_paramstyle = "named" # for non-DSN connections, this *may* be used to # hold the desired driver name pyodbc_driver_name = None def __init__(self, supports_unicode_binds=None, **kw): super(PyODBCConnector, self).__init__(**kw) if supports_unicode_binds is not None: self.supports_unicode_binds = supports_unicode_binds @classmethod def dbapi(cls): return __import__("pyodbc") def create_connect_args(self, url): opts = url.translate_connect_args(username="user") opts.update(url.query) keys = opts query = url.query connect_args = {} 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 = [util.unquote_plus(keys.pop("odbc_connect"))] else: def check_quote(token): if ";" in str(token): token = "'%s'" % token return token keys = dict((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: 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) connectors.append("PWD=%s" % keys.pop("password", "")) 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, connection, cursor): 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 initialize(self, connection): # super(PyODBCConnector, self).initialize(connection) def _dbapi_version(self): if not self.dbapi: return () return self._parse_dbapi_version(self.dbapi.version) def _parse_dbapi_version(self, vers): m = re.match(r"(?:py.*-)?([\d\.]+)(?:-(\w+))?", vers) if not m: return () vers = tuple([int(x) for x in m.group(1).split(".")]) if m.group(2): vers += (m.group(2),) return vers def _get_server_version_info(self, connection, allow_chars=True): # NOTE: this function is not reliable, particularly when # freetds is in use. Implement database-specific server version # queries. dbapi_con = connection.connection version = [] r = re.compile(r"[.\-]") for n in r.split(dbapi_con.getinfo(self.dbapi.SQL_DBMS_VER)): try: version.append(int(n)) except ValueError: if allow_chars: version.append(n) return tuple(version) def set_isolation_level(self, connection, level): # adjust for ConnectionFairy being present # allows attribute set e.g. "connection.autocommit = True" # to work properly if hasattr(connection, "connection"): connection = connection.connection if level == "AUTOCOMMIT": connection.autocommit = True else: connection.autocommit = False super(PyODBCConnector, self).set_isolation_level(connection, level)