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- # sybase/pyodbc.py
- # Copyright (C) 2005-2021 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
-
- """
- .. dialect:: sybase+pyodbc
- :name: PyODBC
- :dbapi: pyodbc
- :connectstring: sybase+pyodbc://<username>:<password>@<dsnname>[/<database>]
- :url: http://pypi.python.org/pypi/pyodbc/
-
- Unicode Support
- ---------------
-
- The pyodbc driver currently supports usage of these Sybase types with
- Unicode or multibyte strings::
-
- CHAR
- NCHAR
- NVARCHAR
- TEXT
- VARCHAR
-
- Currently *not* supported are::
-
- UNICHAR
- UNITEXT
- UNIVARCHAR
-
- """ # noqa
-
- import decimal
-
- from sqlalchemy import processors
- from sqlalchemy import types as sqltypes
- from sqlalchemy.connectors.pyodbc import PyODBCConnector
- from sqlalchemy.dialects.sybase.base import SybaseDialect
- from sqlalchemy.dialects.sybase.base import SybaseExecutionContext
-
-
- class _SybNumeric_pyodbc(sqltypes.Numeric):
- """Turns Decimals with adjusted() < -6 into floats.
-
- It's not yet known how to get decimals with many
- significant digits or very large adjusted() into Sybase
- via pyodbc.
-
- """
-
- def bind_processor(self, dialect):
- super_process = super(_SybNumeric_pyodbc, self).bind_processor(dialect)
-
- def process(value):
- if self.asdecimal and isinstance(value, decimal.Decimal):
-
- if value.adjusted() < -6:
- return processors.to_float(value)
-
- if super_process:
- return super_process(value)
- else:
- return value
-
- return process
-
-
- class SybaseExecutionContext_pyodbc(SybaseExecutionContext):
- def set_ddl_autocommit(self, connection, value):
- if value:
- connection.autocommit = True
- else:
- connection.autocommit = False
-
-
- class SybaseDialect_pyodbc(PyODBCConnector, SybaseDialect):
- execution_ctx_cls = SybaseExecutionContext_pyodbc
- supports_statement_cache = True
-
- colspecs = {sqltypes.Numeric: _SybNumeric_pyodbc}
-
- @classmethod
- def dbapi(cls):
- return PyODBCConnector.dbapi()
-
-
- dialect = SybaseDialect_pyodbc
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