96 lines
3 KiB
Python
96 lines
3 KiB
Python
|
# mysql/pyodbc.py
|
||
|
|
# Copyright (C) 2005-2019 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:: mysql+pyodbc
|
||
|
|
:name: PyODBC
|
||
|
|
:dbapi: pyodbc
|
||
|
|
:connectstring: mysql+pyodbc://<username>:<password>@<dsnname>
|
||
|
|
:url: http://pypi.python.org/pypi/pyodbc/
|
||
|
|
|
||
|
|
.. note:: The PyODBC for MySQL dialect is not well supported, and
|
||
|
|
is subject to unresolved character encoding issues
|
||
|
|
which exist within the current ODBC drivers available.
|
||
|
|
(see http://code.google.com/p/pyodbc/issues/detail?id=25).
|
||
|
|
Other dialects for MySQL are recommended.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
import re
|
||
|
|
|
||
|
|
from .base import MySQLDialect
|
||
|
|
from .base import MySQLExecutionContext
|
||
|
|
from .types import TIME
|
||
|
|
from ... import util
|
||
|
|
from ...connectors.pyodbc import PyODBCConnector
|
||
|
|
from ...sql.sqltypes import Time
|
||
|
|
|
||
|
|
|
||
|
|
class _pyodbcTIME(TIME):
|
||
|
|
def result_processor(self, dialect, coltype):
|
||
|
|
def process(value):
|
||
|
|
# pyodbc returns a datetime.time object; no need to convert
|
||
|
|
return value
|
||
|
|
|
||
|
|
return process
|
||
|
|
|
||
|
|
|
||
|
|
class MySQLExecutionContext_pyodbc(MySQLExecutionContext):
|
||
|
|
def get_lastrowid(self):
|
||
|
|
cursor = self.create_cursor()
|
||
|
|
cursor.execute("SELECT LAST_INSERT_ID()")
|
||
|
|
lastrowid = cursor.fetchone()[0]
|
||
|
|
cursor.close()
|
||
|
|
return lastrowid
|
||
|
|
|
||
|
|
|
||
|
|
class MySQLDialect_pyodbc(PyODBCConnector, MySQLDialect):
|
||
|
|
colspecs = util.update_copy(MySQLDialect.colspecs, {Time: _pyodbcTIME})
|
||
|
|
supports_unicode_statements = False
|
||
|
|
execution_ctx_cls = MySQLExecutionContext_pyodbc
|
||
|
|
|
||
|
|
pyodbc_driver_name = "MySQL"
|
||
|
|
|
||
|
|
def __init__(self, **kw):
|
||
|
|
# deal with http://code.google.com/p/pyodbc/issues/detail?id=25
|
||
|
|
kw.setdefault("convert_unicode", True)
|
||
|
|
super(MySQLDialect_pyodbc, self).__init__(**kw)
|
||
|
|
|
||
|
|
def _detect_charset(self, connection):
|
||
|
|
"""Sniff out the character set in use for connection results."""
|
||
|
|
|
||
|
|
# Prefer 'character_set_results' for the current connection over the
|
||
|
|
# value in the driver. SET NAMES or individual variable SETs will
|
||
|
|
# change the charset without updating the driver's view of the world.
|
||
|
|
#
|
||
|
|
# If it's decided that issuing that sort of SQL leaves you SOL, then
|
||
|
|
# this can prefer the driver value.
|
||
|
|
rs = connection.execute("SHOW VARIABLES LIKE 'character_set%%'")
|
||
|
|
opts = {row[0]: row[1] for row in self._compat_fetchall(rs)}
|
||
|
|
for key in ("character_set_connection", "character_set"):
|
||
|
|
if opts.get(key, None):
|
||
|
|
return opts[key]
|
||
|
|
|
||
|
|
util.warn(
|
||
|
|
"Could not detect the connection character set. "
|
||
|
|
"Assuming latin1."
|
||
|
|
)
|
||
|
|
return "latin1"
|
||
|
|
|
||
|
|
def _extract_error_code(self, exception):
|
||
|
|
m = re.compile(r"\((\d+)\)").search(str(exception.args))
|
||
|
|
c = m.group(1)
|
||
|
|
if c:
|
||
|
|
return int(c)
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
|
||
|
|
dialect = MySQLDialect_pyodbc
|