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parallel-library/lib/sqlalchemy/dialects/mysql/cymysql.py

74 lines
1.9 KiB
Python

# mysql/cymysql.py
# Copyright (C) 2005-2013 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+cymysql
:name: CyMySQL
:dbapi: cymysql
:connectstring: mysql+cymysql://<username>:<password>@<host>/<dbname>[?<options>]
:url: https://github.com/nakagami/CyMySQL
"""
from .mysqldb import MySQLDialect_mysqldb
from .base import (BIT, MySQLDialect)
from ... import util
class _cymysqlBIT(BIT):
def result_processor(self, dialect, coltype):
"""Convert a MySQL's 64 bit, variable length binary string to a long.
"""
def process(value):
if value is not None:
# Py2K
v = 0L
for i in map(ord, value):
v = v << 8 | i
# end Py2K
# Py3K
#v = 0
#for i in value:
# v = v << 8 | i
return v
return value
return process
class MySQLDialect_cymysql(MySQLDialect_mysqldb):
driver = 'cymysql'
description_encoding = None
supports_sane_rowcount = False
colspecs = util.update_copy(
MySQLDialect.colspecs,
{
BIT: _cymysqlBIT,
}
)
@classmethod
def dbapi(cls):
return __import__('cymysql')
def _extract_error_code(self, exception):
return exception.errno
def is_disconnect(self, e, connection, cursor):
if isinstance(e, self.dbapi.OperationalError):
return self._extract_error_code(e) in \
(2006, 2013, 2014, 2045, 2055)
elif isinstance(e, self.dbapi.InterfaceError):
# if underlying connection is closed,
# this is the error you get
return True
else:
return False
dialect = MySQLDialect_cymysql