You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
332 lines
10 KiB
Python
332 lines
10 KiB
Python
# mysql/mysqldb.py
|
|
# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
|
|
# <see AUTHORS file>
|
|
#
|
|
# This module is part of SQLAlchemy and is released under
|
|
# the MIT License: https://www.opensource.org/licenses/mit-license.php
|
|
|
|
"""
|
|
|
|
.. dialect:: mysql+mysqldb
|
|
:name: mysqlclient (maintained fork of MySQL-Python)
|
|
:dbapi: mysqldb
|
|
:connectstring: mysql+mysqldb://<user>:<password>@<host>[:<port>]/<dbname>
|
|
:url: https://pypi.org/project/mysqlclient/
|
|
|
|
Driver Status
|
|
-------------
|
|
|
|
The mysqlclient DBAPI is a maintained fork of the
|
|
`MySQL-Python <https://sourceforge.net/projects/mysql-python>`_ DBAPI
|
|
that is no longer maintained. `mysqlclient`_ supports Python 2 and Python 3
|
|
and is very stable.
|
|
|
|
.. _mysqlclient: https://github.com/PyMySQL/mysqlclient-python
|
|
|
|
.. _mysqldb_unicode:
|
|
|
|
Unicode
|
|
-------
|
|
|
|
Please see :ref:`mysql_unicode` for current recommendations on unicode
|
|
handling.
|
|
|
|
.. _mysqldb_ssl:
|
|
|
|
SSL Connections
|
|
----------------
|
|
|
|
The mysqlclient and PyMySQL DBAPIs accept an additional dictionary under the
|
|
key "ssl", which may be specified using the
|
|
:paramref:`_sa.create_engine.connect_args` dictionary::
|
|
|
|
engine = create_engine(
|
|
"mysql+mysqldb://scott:tiger@192.168.0.134/test",
|
|
connect_args={
|
|
"ssl": {
|
|
"ssl_ca": "/home/gord/client-ssl/ca.pem",
|
|
"ssl_cert": "/home/gord/client-ssl/client-cert.pem",
|
|
"ssl_key": "/home/gord/client-ssl/client-key.pem"
|
|
}
|
|
}
|
|
)
|
|
|
|
For convenience, the following keys may also be specified inline within the URL
|
|
where they will be interpreted into the "ssl" dictionary automatically:
|
|
"ssl_ca", "ssl_cert", "ssl_key", "ssl_capath", "ssl_cipher",
|
|
"ssl_check_hostname". An example is as follows::
|
|
|
|
connection_uri = (
|
|
"mysql+mysqldb://scott:tiger@192.168.0.134/test"
|
|
"?ssl_ca=/home/gord/client-ssl/ca.pem"
|
|
"&ssl_cert=/home/gord/client-ssl/client-cert.pem"
|
|
"&ssl_key=/home/gord/client-ssl/client-key.pem"
|
|
)
|
|
|
|
If the server uses an automatically-generated certificate that is self-signed
|
|
or does not match the host name (as seen from the client), it may also be
|
|
necessary to indicate ``ssl_check_hostname=false``::
|
|
|
|
connection_uri = (
|
|
"mysql+pymysql://scott:tiger@192.168.0.134/test"
|
|
"?ssl_ca=/home/gord/client-ssl/ca.pem"
|
|
"&ssl_cert=/home/gord/client-ssl/client-cert.pem"
|
|
"&ssl_key=/home/gord/client-ssl/client-key.pem"
|
|
"&ssl_check_hostname=false"
|
|
)
|
|
|
|
|
|
.. seealso::
|
|
|
|
:ref:`pymysql_ssl` in the PyMySQL dialect
|
|
|
|
|
|
Using MySQLdb with Google Cloud SQL
|
|
-----------------------------------
|
|
|
|
Google Cloud SQL now recommends use of the MySQLdb dialect. Connect
|
|
using a URL like the following::
|
|
|
|
mysql+mysqldb://root@/<dbname>?unix_socket=/cloudsql/<projectid>:<instancename>
|
|
|
|
Server Side Cursors
|
|
-------------------
|
|
|
|
The mysqldb dialect supports server-side cursors. See :ref:`mysql_ss_cursors`.
|
|
|
|
"""
|
|
|
|
import re
|
|
|
|
from .base import MySQLCompiler
|
|
from .base import MySQLDialect
|
|
from .base import MySQLExecutionContext
|
|
from .base import MySQLIdentifierPreparer
|
|
from .base import TEXT
|
|
from ... import sql
|
|
from ... import util
|
|
|
|
|
|
class MySQLExecutionContext_mysqldb(MySQLExecutionContext):
|
|
@property
|
|
def rowcount(self):
|
|
if hasattr(self, "_rowcount"):
|
|
return self._rowcount
|
|
else:
|
|
return self.cursor.rowcount
|
|
|
|
|
|
class MySQLCompiler_mysqldb(MySQLCompiler):
|
|
pass
|
|
|
|
|
|
class MySQLDialect_mysqldb(MySQLDialect):
|
|
driver = "mysqldb"
|
|
supports_statement_cache = True
|
|
supports_unicode_statements = True
|
|
supports_sane_rowcount = True
|
|
supports_sane_multi_rowcount = True
|
|
|
|
supports_native_decimal = True
|
|
|
|
default_paramstyle = "format"
|
|
execution_ctx_cls = MySQLExecutionContext_mysqldb
|
|
statement_compiler = MySQLCompiler_mysqldb
|
|
preparer = MySQLIdentifierPreparer
|
|
|
|
def __init__(self, **kwargs):
|
|
super(MySQLDialect_mysqldb, self).__init__(**kwargs)
|
|
self._mysql_dbapi_version = (
|
|
self._parse_dbapi_version(self.dbapi.__version__)
|
|
if self.dbapi is not None and hasattr(self.dbapi, "__version__")
|
|
else (0, 0, 0)
|
|
)
|
|
|
|
def _parse_dbapi_version(self, version):
|
|
m = re.match(r"(\d+)\.(\d+)(?:\.(\d+))?", version)
|
|
if m:
|
|
return tuple(int(x) for x in m.group(1, 2, 3) if x is not None)
|
|
else:
|
|
return (0, 0, 0)
|
|
|
|
@util.langhelpers.memoized_property
|
|
def supports_server_side_cursors(self):
|
|
try:
|
|
cursors = __import__("MySQLdb.cursors").cursors
|
|
self._sscursor = cursors.SSCursor
|
|
return True
|
|
except (ImportError, AttributeError):
|
|
return False
|
|
|
|
@classmethod
|
|
def dbapi(cls):
|
|
return __import__("MySQLdb")
|
|
|
|
def on_connect(self):
|
|
super_ = super(MySQLDialect_mysqldb, self).on_connect()
|
|
|
|
def on_connect(conn):
|
|
if super_ is not None:
|
|
super_(conn)
|
|
|
|
charset_name = conn.character_set_name()
|
|
|
|
if charset_name is not None:
|
|
cursor = conn.cursor()
|
|
cursor.execute("SET NAMES %s" % charset_name)
|
|
cursor.close()
|
|
|
|
return on_connect
|
|
|
|
def do_ping(self, dbapi_connection):
|
|
try:
|
|
dbapi_connection.ping(False)
|
|
except self.dbapi.Error as err:
|
|
if self.is_disconnect(err, dbapi_connection, None):
|
|
return False
|
|
else:
|
|
raise
|
|
else:
|
|
return True
|
|
|
|
def do_executemany(self, cursor, statement, parameters, context=None):
|
|
rowcount = cursor.executemany(statement, parameters)
|
|
if context is not None:
|
|
context._rowcount = rowcount
|
|
|
|
def _check_unicode_returns(self, connection):
|
|
# work around issue fixed in
|
|
# https://github.com/farcepest/MySQLdb1/commit/cd44524fef63bd3fcb71947392326e9742d520e8
|
|
# specific issue w/ the utf8mb4_bin collation and unicode returns
|
|
|
|
collation = connection.exec_driver_sql(
|
|
"show collation where %s = 'utf8mb4' and %s = 'utf8mb4_bin'"
|
|
% (
|
|
self.identifier_preparer.quote("Charset"),
|
|
self.identifier_preparer.quote("Collation"),
|
|
)
|
|
).scalar()
|
|
has_utf8mb4_bin = self.server_version_info > (5,) and collation
|
|
if has_utf8mb4_bin:
|
|
additional_tests = [
|
|
sql.collate(
|
|
sql.cast(
|
|
sql.literal_column("'test collated returns'"),
|
|
TEXT(charset="utf8mb4"),
|
|
),
|
|
"utf8mb4_bin",
|
|
)
|
|
]
|
|
else:
|
|
additional_tests = []
|
|
return super(MySQLDialect_mysqldb, self)._check_unicode_returns(
|
|
connection, additional_tests
|
|
)
|
|
|
|
def create_connect_args(self, url, _translate_args=None):
|
|
if _translate_args is None:
|
|
_translate_args = dict(
|
|
database="db", username="user", password="passwd"
|
|
)
|
|
|
|
opts = url.translate_connect_args(**_translate_args)
|
|
opts.update(url.query)
|
|
|
|
util.coerce_kw_type(opts, "compress", bool)
|
|
util.coerce_kw_type(opts, "connect_timeout", int)
|
|
util.coerce_kw_type(opts, "read_timeout", int)
|
|
util.coerce_kw_type(opts, "write_timeout", int)
|
|
util.coerce_kw_type(opts, "client_flag", int)
|
|
util.coerce_kw_type(opts, "local_infile", int)
|
|
# Note: using either of the below will cause all strings to be
|
|
# returned as Unicode, both in raw SQL operations and with column
|
|
# types like String and MSString.
|
|
util.coerce_kw_type(opts, "use_unicode", bool)
|
|
util.coerce_kw_type(opts, "charset", str)
|
|
|
|
# Rich values 'cursorclass' and 'conv' are not supported via
|
|
# query string.
|
|
|
|
ssl = {}
|
|
keys = [
|
|
("ssl_ca", str),
|
|
("ssl_key", str),
|
|
("ssl_cert", str),
|
|
("ssl_capath", str),
|
|
("ssl_cipher", str),
|
|
("ssl_check_hostname", bool),
|
|
]
|
|
for key, kw_type in keys:
|
|
if key in opts:
|
|
ssl[key[4:]] = opts[key]
|
|
util.coerce_kw_type(ssl, key[4:], kw_type)
|
|
del opts[key]
|
|
if ssl:
|
|
opts["ssl"] = ssl
|
|
|
|
# FOUND_ROWS must be set in CLIENT_FLAGS to enable
|
|
# supports_sane_rowcount.
|
|
client_flag = opts.get("client_flag", 0)
|
|
|
|
client_flag_found_rows = self._found_rows_client_flag()
|
|
if client_flag_found_rows is not None:
|
|
client_flag |= client_flag_found_rows
|
|
opts["client_flag"] = client_flag
|
|
return [[], opts]
|
|
|
|
def _found_rows_client_flag(self):
|
|
if self.dbapi is not None:
|
|
try:
|
|
CLIENT_FLAGS = __import__(
|
|
self.dbapi.__name__ + ".constants.CLIENT"
|
|
).constants.CLIENT
|
|
except (AttributeError, ImportError):
|
|
return None
|
|
else:
|
|
return CLIENT_FLAGS.FOUND_ROWS
|
|
else:
|
|
return None
|
|
|
|
def _extract_error_code(self, exception):
|
|
return exception.args[0]
|
|
|
|
def _detect_charset(self, connection):
|
|
"""Sniff out the character set in use for connection results."""
|
|
|
|
try:
|
|
# note: the SQL here would be
|
|
# "SHOW VARIABLES LIKE 'character_set%%'"
|
|
cset_name = connection.connection.character_set_name
|
|
except AttributeError:
|
|
util.warn(
|
|
"No 'character_set_name' can be detected with "
|
|
"this MySQL-Python version; "
|
|
"please upgrade to a recent version of MySQL-Python. "
|
|
"Assuming latin1."
|
|
)
|
|
return "latin1"
|
|
else:
|
|
return cset_name()
|
|
|
|
_isolation_lookup = set(
|
|
[
|
|
"SERIALIZABLE",
|
|
"READ UNCOMMITTED",
|
|
"READ COMMITTED",
|
|
"REPEATABLE READ",
|
|
"AUTOCOMMIT",
|
|
]
|
|
)
|
|
|
|
def _set_isolation_level(self, connection, level):
|
|
if level == "AUTOCOMMIT":
|
|
connection.autocommit(True)
|
|
else:
|
|
connection.autocommit(False)
|
|
super(MySQLDialect_mysqldb, self)._set_isolation_level(
|
|
connection, level
|
|
)
|
|
|
|
|
|
dialect = MySQLDialect_mysqldb
|