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# mysql/pymysql.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
r"""
.. dialect:: mysql+pymysql
:name: PyMySQL
:dbapi: pymysql
:connectstring: mysql+pymysql://<username>:<password>@<host>/<dbname>[?<options>]
:url: https://pymysql.readthedocs.io/
Unicode
-------
Please see :ref:`mysql_unicode` for current recommendations on unicode
handling.
MySQL-Python Compatibility
--------------------------
The pymysql DBAPI is a pure Python port of the MySQL-python (MySQLdb) driver,
and targets 100% compatibility. Most behavioral notes for MySQL-python apply
to the pymysql driver as well.
""" # noqa
from .mysqldb import MySQLDialect_mysqldb
from ...util import langhelpers
from ...util import py3k
class MySQLDialect_pymysql(MySQLDialect_mysqldb):
driver = "pymysql"
description_encoding = None
# generally, these two values should be both True
# or both False. PyMySQL unicode tests pass all the way back
# to 0.4 either way. See [ticket:3337]
supports_unicode_statements = True
supports_unicode_binds = True
def __init__(self, server_side_cursors=False, **kwargs):
super(MySQLDialect_pymysql, self).__init__(**kwargs)
self.server_side_cursors = server_side_cursors
@langhelpers.memoized_property
def supports_server_side_cursors(self):
try:
cursors = __import__("pymysql.cursors").cursors
self._sscursor = cursors.SSCursor
return True
except (ImportError, AttributeError):
return False
@classmethod
def dbapi(cls):
return __import__("pymysql")
def create_connect_args(self, url, _translate_args=None):
if _translate_args is None:
_translate_args = dict(username="user")
return super(MySQLDialect_pymysql, self).create_connect_args(
url, _translate_args=_translate_args
)
def is_disconnect(self, e, connection, cursor):
if super(MySQLDialect_pymysql, self).is_disconnect(
e, connection, cursor
):
return True
elif isinstance(e, self.dbapi.Error):
str_e = str(e).lower()
return (
"already closed" in str_e or "connection was killed" in str_e
)
else:
return False
if py3k:
def _extract_error_code(self, exception):
if isinstance(exception.args[0], Exception):
exception = exception.args[0]
return exception.args[0]
dialect = MySQLDialect_pymysql
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