Refs #23919 -- Removed obsolete MySQLdb references.

django/db/backends/mysql/base.py

@@ -16,7 +16,7 @@ try:
 except ImportError as err:
     raise ImproperlyConfigured(
         'Error loading MySQLdb module.\n'
-        'Did you install mysqlclient or MySQL-python?'
+        'Did you install mysqlclient?'
     ) from err
 
 from MySQLdb.constants import CLIENT, FIELD_TYPE                # isort:skip
@@ -31,18 +31,14 @@ from .operations import DatabaseOperations                  # isort:skip
 from .schema import DatabaseSchemaEditor                    # isort:skip
 from .validation import DatabaseValidation                  # isort:skip
 
-# We want version (1, 2, 1, 'final', 2) or later. We can't just use
-# lexicographic ordering in this check because then (1, 2, 1, 'gamma')
-# inadvertently passes the version test.
 version = Database.version_info
-if (version < (1, 2, 1) or (
-        version[:3] == (1, 2, 1) and (len(version) < 5 or version[3] != 'final' or version[4] < 2))):
-    raise ImproperlyConfigured("MySQLdb-1.2.1p2 or newer is required; you have %s" % Database.__version__)
+if version < (1, 3, 3):
+    raise ImproperlyConfigured("mysqlclient 1.3.3 or newer is required; you have %s" % Database.__version__)
 
 
-# MySQLdb-1.2.1 returns TIME columns as timedelta -- they are more like
-# timedelta in terms of actual behavior as they are signed and include days --
-# and Django expects time.
+# MySQLdb returns TIME columns as timedelta -- they are more like timedelta in
+# terms of actual behavior as they are signed and include days -- and Django
+# expects time.
 django_conversions = conversions.copy()
 django_conversions.update({
     FIELD_TYPE.TIME: backend_utils.typecast_time,
@@ -53,13 +49,6 @@ django_conversions.update({
 server_version_re = re.compile(r'(\d{1,2})\.(\d{1,2})\.(\d{1,2})')
 
 
-# MySQLdb-1.2.1 and newer automatically makes use of SHOW WARNINGS on
-# MySQL-4.1 and newer, so the MysqlDebugWrapper is unnecessary. Since the
-# point is to raise Warnings as exceptions, this can be done with the Python
-# warning module, and this is setup when the connection is created, and the
-# standard backend_utils.CursorDebugWrapper can be used. Also, using sql_mode
-# TRADITIONAL will automatically cause most warnings to be treated as errors.
-
 class CursorWrapper:
     """
     A thin wrapper around MySQLdb's normal cursor class so that we can catch

django/db/backends/mysql/features.py

 from django.db.backends.base.features import BaseDatabaseFeatures
 from django.utils.functional import cached_property
 
-from .base import Database
-
 
 class DatabaseFeatures(BaseDatabaseFeatures):
     empty_fetchmany_value = ()
@@ -48,9 +46,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
 
     @cached_property
     def supports_microsecond_precision(self):
-        # See https://github.com/farcepest/MySQLdb1/issues/24 for the reason
-        # about requiring MySQLdb 1.2.5
-        return self.connection.mysql_version >= (5, 6, 4) and Database.version_info >= (1, 2, 5)
+        return self.connection.mysql_version >= (5, 6, 4)
 
     @cached_property
     def has_zoneinfo_database(self):

docs/ref/databases.txt

@@ -284,11 +284,11 @@ MySQL has a couple drivers that implement the Python Database API described in
 .. _mysqlclient: https://pypi.python.org/pypi/mysqlclient
 .. _MySQL Connector/Python: https://dev.mysql.com/downloads/connector/python
 
-All these drivers are thread-safe and provide connection pooling.
+These drivers are thread-safe and provide connection pooling.
 
 In addition to a DB API driver, Django needs an adapter to access the database
-drivers from its ORM. Django provides an adapter for MySQLdb/mysqlclient while
-MySQL Connector/Python includes `its own`_.
+drivers from its ORM. Django provides an adapter for mysqlclient while MySQL
+Connector/Python includes `its own`_.
 
 .. _its own: https://dev.mysql.com/doc/connector-python/en/connector-python-django-backend.html
 
@@ -348,46 +348,9 @@ comparisons being done in a *case-insensitive* manner. That is, ``"Fred"`` and
 ``"freD"`` are considered equal at the database level. If you have a unique
 constraint on a field, it would be illegal to try to insert both ``"aa"`` and
 ``"AA"`` into the same column, since they compare as equal (and, hence,
-non-unique) with the default collation.
-
-In many cases, this default will not be a problem. However, if you really want
-case-sensitive comparisons on a particular column or table, you would change
-the column or table to use the ``utf8_bin`` collation. The main thing to be
-aware of in this case is that if you are using MySQLdb 1.2.2, the database
-backend in Django will then return bytestrings (instead of unicode strings) for
-any character fields it receive from the database. This is a strong variation
-from Django's normal practice of *always* returning unicode strings. It is up
-to you, the developer, to handle the fact that you will receive bytestrings if
-you configure your table(s) to use ``utf8_bin`` collation. Django itself should
-mostly work smoothly with such columns (except for the ``contrib.sessions``
-``Session`` and ``contrib.admin`` ``LogEntry`` tables described below), but
-your code must be prepared to call ``django.utils.encoding.force_text()`` at
-times if it really wants to work with consistent data -- Django will not do
-this for you (the database backend layer and the model population layer are
-separated internally so the database layer doesn't know it needs to make this
-conversion in this one particular case).
-
-If you're using MySQLdb 1.2.1p2, Django's standard
-:class:`~django.db.models.CharField` class will return unicode strings even
-with ``utf8_bin`` collation. However, :class:`~django.db.models.TextField`
-fields will be returned as an ``array.array`` instance (from Python's standard
-``array`` module). There isn't a lot Django can do about that, since, again,
-the information needed to make the necessary conversions isn't available when
-the data is read in from the database. This problem was `fixed in MySQLdb
-1.2.2`_, so if you want to use :class:`~django.db.models.TextField` with
-``utf8_bin`` collation, upgrading to version 1.2.2 and then dealing with the
-bytestrings (which shouldn't be too difficult) as described above is the
-recommended solution.
-
-Should you decide to use ``utf8_bin`` collation for some of your tables with
-MySQLdb 1.2.1p2 or 1.2.2, you should still use ``utf8_general_ci``
-(the default) collation for the ``django.contrib.sessions.models.Session``
-table (usually called ``django_session``) and the
-:class:`django.contrib.admin.models.LogEntry` table (usually called
-``django_admin_log``). Those are the two standard tables that use
-:class:`~django.db.models.TextField` internally.
-
-.. _fixed in MySQLdb 1.2.2: http://sourceforge.net/tracker/index.php?func=detail&aid=1495765&group_id=22307&atid=374932
+non-unique) with the default collation. If you want case-sensitive comparisons
+on a particular column or table, change the column or table to use the
+``utf8_bin`` collation.
 
 Please note that according to `MySQL Unicode Character Sets`_, comparisons for
 the ``utf8_general_ci`` collation are faster, but slightly less correct, than
@@ -441,12 +404,11 @@ Here's a sample configuration which uses a MySQL option file::
     password = PASSWORD
     default-character-set = utf8
 
-Several other MySQLdb connection options may be useful, such as ``ssl``,
-``init_command``, and ``sql_mode``. Consult the `MySQLdb documentation`_ for
-more details.
+Several other `MySQLdb connection options`_ may be useful, such as ``ssl``,
+``init_command``, and ``sql_mode``.
 
 .. _MySQL option file: https://dev.mysql.com/doc/refman/en/option-files.html
-.. _MySQLdb documentation: http://mysql-python.sourceforge.net/
+.. _MySQLdb connection options: https://mysqlclient.readthedocs.io/en/latest/user_guide.html#functions-and-attributes
 
 .. _mysql-sql-mode:
 
@@ -575,11 +537,7 @@ Fractional seconds support for Time and DateTime fields
 
 MySQL 5.6.4 and later can store fractional seconds, provided that the
 column definition includes a fractional indication (e.g. ``DATETIME(6)``).
-Earlier versions do not support them at all. In addition, versions of MySQLdb
-older than 1.2.5 have `a bug`_ that also prevents the use of fractional seconds
-with MySQL.
-
-.. _a bug: https://github.com/farcepest/MySQLdb1/issues/24
+Earlier versions do not support them at all.
 
 Django will not upgrade existing columns to include fractional seconds if the
 database server supports it. If you want to enable them on an existing database,

docs/ref/models/fields.txt

@@ -471,13 +471,6 @@ The default form widget for this field is a :class:`~django.forms.TextInput`.
     ``max_length`` for some backends. Refer to the :doc:`database backend
     notes </ref/databases>` for details.
 
-.. admonition:: MySQL users
-
-    If you are using this field with MySQLdb 1.2.2 and the ``utf8_bin``
-    collation (which is *not* the default), there are some issues to be aware
-    of. Refer to the :ref:`MySQL database notes <mysql-collation>` for
-    details.
-
 ``DateField``
 -------------
 
@@ -1080,13 +1073,6 @@ If you specify a ``max_length`` attribute, it will be reflected in the
 However it is not enforced at the model or database level. Use a
 :class:`CharField` for that.
 
-.. admonition:: MySQL users
-
-    If you are using this field with MySQLdb 1.2.1p2 and the ``utf8_bin``
-    collation (which is *not* the default), there are some issues to be aware
-    of. Refer to the :ref:`MySQL database notes <mysql-collation>` for
-    details.
-
 ``TimeField``
 -------------