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90 lines
2.2 KiB
90 lines
2.2 KiB
3 years ago
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# sybase/pyodbc.py
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# Copyright (C) 2005-2022 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+pyodbc
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:name: PyODBC
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:dbapi: pyodbc
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:connectstring: sybase+pyodbc://<username>:<password>@<dsnname>[/<database>]
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:url: https://pypi.org/project/pyodbc/
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Unicode Support
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---------------
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The pyodbc driver currently supports usage of these Sybase types with
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Unicode or multibyte strings::
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CHAR
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NCHAR
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NVARCHAR
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TEXT
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VARCHAR
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Currently *not* supported are::
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UNICHAR
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UNITEXT
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UNIVARCHAR
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""" # noqa
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import decimal
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from sqlalchemy import processors
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from sqlalchemy import types as sqltypes
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from sqlalchemy.connectors.pyodbc import PyODBCConnector
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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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class _SybNumeric_pyodbc(sqltypes.Numeric):
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"""Turns Decimals with adjusted() < -6 into floats.
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It's not yet known how to get decimals with many
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significant digits or very large adjusted() into Sybase
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via pyodbc.
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"""
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def bind_processor(self, dialect):
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super_process = super(_SybNumeric_pyodbc, self).bind_processor(dialect)
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def process(value):
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if self.asdecimal and isinstance(value, decimal.Decimal):
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if value.adjusted() < -6:
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return processors.to_float(value)
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if super_process:
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return super_process(value)
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else:
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return value
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return process
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class SybaseExecutionContext_pyodbc(SybaseExecutionContext):
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def set_ddl_autocommit(self, connection, value):
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if value:
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connection.autocommit = True
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else:
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connection.autocommit = False
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class SybaseDialect_pyodbc(PyODBCConnector, SybaseDialect):
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execution_ctx_cls = SybaseExecutionContext_pyodbc
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supports_statement_cache = True
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colspecs = {sqltypes.Numeric: _SybNumeric_pyodbc}
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@classmethod
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def dbapi(cls):
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return PyODBCConnector.dbapi()
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dialect = SybaseDialect_pyodbc
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