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107 lines
3.3 KiB
Python
107 lines
3.3 KiB
Python
2 months ago
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# sybase/pysybase.py
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# Copyright (C) 2010-2022 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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"""
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.. dialect:: sybase+pysybase
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:name: Python-Sybase
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:dbapi: Sybase
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:connectstring: sybase+pysybase://<username>:<password>@<dsn>/[database name]
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:url: https://python-sybase.sourceforge.net/
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Unicode Support
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---------------
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The python-sybase driver does not appear to support non-ASCII strings of any
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kind at this time.
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""" # noqa
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from sqlalchemy import processors
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from sqlalchemy import types as sqltypes
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from sqlalchemy.dialects.sybase.base import SybaseDialect
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from sqlalchemy.dialects.sybase.base import SybaseExecutionContext
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from sqlalchemy.dialects.sybase.base import SybaseSQLCompiler
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class _SybNumeric(sqltypes.Numeric):
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def result_processor(self, dialect, type_):
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if not self.asdecimal:
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return processors.to_float
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else:
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return sqltypes.Numeric.result_processor(self, dialect, type_)
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class SybaseExecutionContext_pysybase(SybaseExecutionContext):
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def set_ddl_autocommit(self, dbapi_connection, value):
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if value:
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# call commit() on the Sybase connection directly,
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# to avoid any side effects of calling a Connection
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# transactional method inside of pre_exec()
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dbapi_connection.commit()
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def pre_exec(self):
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SybaseExecutionContext.pre_exec(self)
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for param in self.parameters:
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for key in list(param):
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param["@" + key] = param[key]
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del param[key]
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class SybaseSQLCompiler_pysybase(SybaseSQLCompiler):
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def bindparam_string(self, name, **kw):
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return "@" + name
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class SybaseDialect_pysybase(SybaseDialect):
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driver = "pysybase"
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execution_ctx_cls = SybaseExecutionContext_pysybase
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statement_compiler = SybaseSQLCompiler_pysybase
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supports_statement_cache = True
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colspecs = {sqltypes.Numeric: _SybNumeric, sqltypes.Float: sqltypes.Float}
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@classmethod
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def dbapi(cls):
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import Sybase
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return Sybase
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def create_connect_args(self, url):
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opts = url.translate_connect_args(username="user", password="passwd")
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return ([opts.pop("host")], opts)
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def do_executemany(self, cursor, statement, parameters, context=None):
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# calling python-sybase executemany yields:
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# TypeError: string too long for buffer
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for param in parameters:
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cursor.execute(statement, param)
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def _get_server_version_info(self, connection):
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vers = connection.exec_driver_sql("select @@version_number").scalar()
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# i.e. 15500, 15000, 12500 == (15, 5, 0, 0), (15, 0, 0, 0),
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# (12, 5, 0, 0)
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return (vers / 1000, vers % 1000 / 100, vers % 100 / 10, vers % 10)
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def is_disconnect(self, e, connection, cursor):
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if isinstance(
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e, (self.dbapi.OperationalError, self.dbapi.ProgrammingError)
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):
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msg = str(e)
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return (
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"Unable to complete network request to host" in msg
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or "Invalid connection state" in msg
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or "Invalid cursor state" in msg
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)
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else:
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return False
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dialect = SybaseDialect_pysybase
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