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https://github.com/moparisthebest/SickRage
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95 lines
3.4 KiB
Python
95 lines
3.4 KiB
Python
# mysql/mysqldb.py
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# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors <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: http://www.opensource.org/licenses/mit-license.php
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"""
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.. dialect:: mysql+mysqldb
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:name: MySQL-Python
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:dbapi: mysqldb
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:connectstring: mysql+mysqldb://<user>:<password>@<host>[:<port>]/<dbname>
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:url: http://sourceforge.net/projects/mysql-python
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Unicode
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-------
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MySQLdb requires a "charset" parameter to be passed in order for it
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to handle non-ASCII characters correctly. When this parameter is passed,
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MySQLdb will also implicitly set the "use_unicode" flag to true, which means
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that it will return Python unicode objects instead of bytestrings.
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However, SQLAlchemy's decode process, when C extensions are enabled,
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is orders of magnitude faster than that of MySQLdb as it does not call into
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Python functions to do so. Therefore, the **recommended URL to use for
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unicode** will include both charset and use_unicode=0::
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create_engine("mysql+mysqldb://user:pass@host/dbname?charset=utf8&use_unicode=0")
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As of this writing, MySQLdb only runs on Python 2. It is not known how
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MySQLdb behaves on Python 3 as far as unicode decoding.
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Known Issues
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-------------
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MySQL-python version 1.2.2 has a serious memory leak related
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to unicode conversion, a feature which is disabled via ``use_unicode=0``.
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It is strongly advised to use the latest version of MySQL-Python.
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"""
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from .base import (MySQLDialect, MySQLExecutionContext,
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MySQLCompiler, MySQLIdentifierPreparer)
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from ...connectors.mysqldb import (
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MySQLDBExecutionContext,
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MySQLDBCompiler,
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MySQLDBIdentifierPreparer,
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MySQLDBConnector
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)
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from .base import TEXT
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from ... import sql
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class MySQLExecutionContext_mysqldb(MySQLDBExecutionContext, MySQLExecutionContext):
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pass
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class MySQLCompiler_mysqldb(MySQLDBCompiler, MySQLCompiler):
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pass
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class MySQLIdentifierPreparer_mysqldb(MySQLDBIdentifierPreparer, MySQLIdentifierPreparer):
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pass
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class MySQLDialect_mysqldb(MySQLDBConnector, MySQLDialect):
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execution_ctx_cls = MySQLExecutionContext_mysqldb
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statement_compiler = MySQLCompiler_mysqldb
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preparer = MySQLIdentifierPreparer_mysqldb
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def _check_unicode_returns(self, connection):
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# work around issue fixed in
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# https://github.com/farcepest/MySQLdb1/commit/cd44524fef63bd3fcb71947392326e9742d520e8
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# specific issue w/ the utf8_bin collation and unicode returns
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has_utf8_bin = connection.scalar(
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"show collation where %s = 'utf8' and %s = 'utf8_bin'"
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% (
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self.identifier_preparer.quote("Charset"),
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self.identifier_preparer.quote("Collation")
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))
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if has_utf8_bin:
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additional_tests = [
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sql.collate(sql.cast(
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sql.literal_column(
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"'test collated returns'"),
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TEXT(charset='utf8')), "utf8_bin")
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]
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else:
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additional_tests = []
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return super(MySQLDBConnector, self)._check_unicode_returns(
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connection, additional_tests)
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dialect = MySQLDialect_mysqldb
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