You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
131 lines
4.0 KiB
131 lines
4.0 KiB
# mysql/pyodbc.py
|
|
# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
|
|
# <see AUTHORS file>
|
|
#
|
|
# This module is part of SQLAlchemy and is released under
|
|
# the MIT License: https://www.opensource.org/licenses/mit-license.php
|
|
|
|
r"""
|
|
|
|
|
|
.. dialect:: mysql+pyodbc
|
|
:name: PyODBC
|
|
:dbapi: pyodbc
|
|
:connectstring: mysql+pyodbc://<username>:<password>@<dsnname>
|
|
:url: https://pypi.org/project/pyodbc/
|
|
|
|
.. note::
|
|
|
|
The PyODBC for MySQL dialect is **not tested as part of
|
|
SQLAlchemy's continuous integration**.
|
|
The recommended MySQL dialects are mysqlclient and PyMySQL.
|
|
However, if you want to use the mysql+pyodbc dialect and require
|
|
full support for ``utf8mb4`` characters (including supplementary
|
|
characters like emoji) be sure to use a current release of
|
|
MySQL Connector/ODBC and specify the "ANSI" (**not** "Unicode")
|
|
version of the driver in your DSN or connection string.
|
|
|
|
Pass through exact pyodbc connection string::
|
|
|
|
import urllib
|
|
connection_string = (
|
|
'DRIVER=MySQL ODBC 8.0 ANSI Driver;'
|
|
'SERVER=localhost;'
|
|
'PORT=3307;'
|
|
'DATABASE=mydb;'
|
|
'UID=root;'
|
|
'PWD=(whatever);'
|
|
'charset=utf8mb4;'
|
|
)
|
|
params = urllib.parse.quote_plus(connection_string)
|
|
connection_uri = "mysql+pyodbc:///?odbc_connect=%s" % params
|
|
|
|
""" # noqa
|
|
|
|
import re
|
|
|
|
from .base import MySQLDialect
|
|
from .base import MySQLExecutionContext
|
|
from .types import TIME
|
|
from ... import exc
|
|
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):
|
|
supports_statement_cache = True
|
|
colspecs = util.update_copy(MySQLDialect.colspecs, {Time: _pyodbcTIME})
|
|
supports_unicode_statements = True
|
|
execution_ctx_cls = MySQLExecutionContext_pyodbc
|
|
|
|
pyodbc_driver_name = "MySQL"
|
|
|
|
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.
|
|
try:
|
|
value = self._fetch_setting(connection, "character_set_client")
|
|
if value:
|
|
return value
|
|
except exc.DBAPIError:
|
|
pass
|
|
|
|
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
|
|
|
|
def on_connect(self):
|
|
super_ = super(MySQLDialect_pyodbc, self).on_connect()
|
|
|
|
def on_connect(conn):
|
|
if super_ is not None:
|
|
super_(conn)
|
|
|
|
# declare Unicode encoding for pyodbc as per
|
|
# https://github.com/mkleehammer/pyodbc/wiki/Unicode
|
|
pyodbc_SQL_CHAR = 1 # pyodbc.SQL_CHAR
|
|
pyodbc_SQL_WCHAR = -8 # pyodbc.SQL_WCHAR
|
|
conn.setdecoding(pyodbc_SQL_CHAR, encoding="utf-8")
|
|
conn.setdecoding(pyodbc_SQL_WCHAR, encoding="utf-8")
|
|
conn.setencoding(encoding="utf-8")
|
|
|
|
return on_connect
|
|
|
|
|
|
dialect = MySQLDialect_pyodbc
|