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83 lines
2.2 KiB
Python
83 lines
2.2 KiB
Python
2 months ago
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# mysql/cymysql.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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r"""
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.. dialect:: mysql+cymysql
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:name: CyMySQL
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:dbapi: cymysql
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:connectstring: mysql+cymysql://<username>:<password>@<host>/<dbname>[?<options>]
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:url: https://github.com/nakagami/CyMySQL
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.. note::
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The CyMySQL dialect is **not tested as part of SQLAlchemy's continuous
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integration** and may have unresolved issues. The recommended MySQL
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dialects are mysqlclient and PyMySQL.
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""" # noqa
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from .base import BIT
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from .base import MySQLDialect
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from .mysqldb import MySQLDialect_mysqldb
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from ... import util
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class _cymysqlBIT(BIT):
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def result_processor(self, dialect, coltype):
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"""Convert MySQL's 64 bit, variable length binary string to a long."""
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def process(value):
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if value is not None:
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v = 0
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for i in util.iterbytes(value):
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v = v << 8 | i
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return v
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return value
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return process
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class MySQLDialect_cymysql(MySQLDialect_mysqldb):
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driver = "cymysql"
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supports_statement_cache = True
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description_encoding = None
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supports_sane_rowcount = True
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supports_sane_multi_rowcount = False
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supports_unicode_statements = True
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colspecs = util.update_copy(MySQLDialect.colspecs, {BIT: _cymysqlBIT})
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@classmethod
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def dbapi(cls):
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return __import__("cymysql")
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def _detect_charset(self, connection):
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return connection.connection.charset
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def _extract_error_code(self, exception):
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return exception.errno
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def is_disconnect(self, e, connection, cursor):
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if isinstance(e, self.dbapi.OperationalError):
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return self._extract_error_code(e) in (
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2006,
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2013,
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2014,
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2045,
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2055,
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)
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elif isinstance(e, self.dbapi.InterfaceError):
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# if underlying connection is closed,
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# this is the error you get
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return True
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else:
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return False
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dialect = MySQLDialect_cymysql
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