[1.11.x] Bumped MySQLdb version requirement to 1.2.3.

Older versions don't support Python 2.7.

Partial backport of 2d96c027f5eb32c2c09bd57df2240ae1d343b98e from master

1 files changed, 10 insertions, 18 deletions

diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index d0487c5e30..06833236e7 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -42,13 +42,12 @@ 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, 2, 3):
+    raise ImproperlyConfigured(
+        "MySQLdb/mysqlclient 1.2.3 or newer is required; you have %s"
+        % Database.__version__
+    )
 
 
 def adapt_datetime_warn_on_aware_datetime(value, conv):
@@ -65,11 +64,11 @@ def adapt_datetime_warn_on_aware_datetime(value, conv):
     return Thing2Literal(value.strftime("%Y-%m-%d %H:%M:%S.%f"), conv)
 
 
-# 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, so we still need to override that. We also need to
-# add special handling for SafeText and SafeBytes as MySQLdb's type
-# checking is too tight to catch those (see Django ticket #6052).
+# 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, so we still need to override that. We also need to add special
+# handling for SafeText and SafeBytes as MySQLdb's type checking is too tight
+# to catch those (see Django ticket #6052).
 django_conversions = conversions.copy()
 django_conversions.update({
     FIELD_TYPE.TIME: backend_utils.typecast_time,
@@ -83,13 +82,6 @@ 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(object):
     """
     A thin wrapper around MySQLdb's normal cursor class so that we can catch