/usr/lib/python2.7/dist-packages/sqlalchemy/dialects/mysql/mysqldb.py is in python-sqlalchemy 0.9.8+dfsg-0.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | # mysql/mysqldb.py
# Copyright (C) 2005-2014 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+mysqldb
:name: MySQL-Python
:dbapi: mysqldb
:connectstring: mysql+mysqldb://<user>:<password>@<host>[:<port>]/<dbname>
:url: http://sourceforge.net/projects/mysql-python
Unicode
-------
MySQLdb requires a "charset" parameter to be passed in order for it
to handle non-ASCII characters correctly. When this parameter is passed,
MySQLdb will also implicitly set the "use_unicode" flag to true, which means
that it will return Python unicode objects instead of bytestrings.
However, SQLAlchemy's decode process, when C extensions are enabled,
is orders of magnitude faster than that of MySQLdb as it does not call into
Python functions to do so. Therefore, the **recommended URL to use for
unicode** will include both charset and use_unicode=0::
create_engine("mysql+mysqldb://user:pass@host/dbname?charset=utf8&use_unicode=0")
As of this writing, MySQLdb only runs on Python 2. It is not known how
MySQLdb behaves on Python 3 as far as unicode decoding.
Known Issues
-------------
MySQL-python version 1.2.2 has a serious memory leak related
to unicode conversion, a feature which is disabled via ``use_unicode=0``.
It is strongly advised to use the latest version of MySQL-Python.
"""
from .base import (MySQLDialect, MySQLExecutionContext,
MySQLCompiler, MySQLIdentifierPreparer)
from ...connectors.mysqldb import (
MySQLDBExecutionContext,
MySQLDBCompiler,
MySQLDBIdentifierPreparer,
MySQLDBConnector
)
from .base import TEXT
from ... import sql
class MySQLExecutionContext_mysqldb(
MySQLDBExecutionContext,
MySQLExecutionContext):
pass
class MySQLCompiler_mysqldb(MySQLDBCompiler, MySQLCompiler):
pass
class MySQLIdentifierPreparer_mysqldb(
MySQLDBIdentifierPreparer,
MySQLIdentifierPreparer):
pass
class MySQLDialect_mysqldb(MySQLDBConnector, MySQLDialect):
execution_ctx_cls = MySQLExecutionContext_mysqldb
statement_compiler = MySQLCompiler_mysqldb
preparer = MySQLIdentifierPreparer_mysqldb
def _check_unicode_returns(self, connection):
# work around issue fixed in
# https://github.com/farcepest/MySQLdb1/commit/cd44524fef63bd3fcb71947392326e9742d520e8
# specific issue w/ the utf8_bin collation and unicode returns
has_utf8_bin = connection.scalar(
"show collation where %s = 'utf8' and %s = 'utf8_bin'"
% (
self.identifier_preparer.quote("Charset"),
self.identifier_preparer.quote("Collation")
))
if has_utf8_bin:
additional_tests = [
sql.collate(sql.cast(
sql.literal_column(
"'test collated returns'"),
TEXT(charset='utf8')), "utf8_bin")
]
else:
additional_tests = []
return super(MySQLDBConnector, self)._check_unicode_returns(
connection, additional_tests)
dialect = MySQLDialect_mysqldb
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