Refs #31331 -- Added DatabaseWrapper.sql_mode to MySQL.

django/db/backends/mysql/base.py

@@ -364,3 +364,10 @@ class DatabaseWrapper(BaseDatabaseWrapper):
     @cached_property
     def mysql_is_mariadb(self):
         return 'mariadb' in self.mysql_server_info.lower()
+
+    @cached_property
+    def sql_mode(self):
+        with self.cursor() as cursor:
+            cursor.execute('SELECT @@sql_mode')
+            sql_mode = cursor.fetchone()
+        return set(sql_mode[0].split(',') if sql_mode else ())

django/db/backends/mysql/validation.py

@@ -10,11 +10,7 @@ class DatabaseValidation(BaseDatabaseValidation):
         return issues
 
     def _check_sql_mode(self, **kwargs):
-        with self.connection.cursor() as cursor:
-            cursor.execute("SELECT @@sql_mode")
-            sql_mode = cursor.fetchone()
-        modes = set(sql_mode[0].split(',') if sql_mode else ())
-        if not (modes & {'STRICT_TRANS_TABLES', 'STRICT_ALL_TABLES'}):
+        if not (self.connection.sql_mode & {'STRICT_TRANS_TABLES', 'STRICT_ALL_TABLES'}):
             return [checks.Warning(
                 "MySQL Strict Mode is not set for database connection '%s'" % self.connection.alias,
                 hint="MySQL's Strict Mode fixes many data integrity problems in MySQL, "

tests/check_framework/test_database.py

@@ -2,7 +2,7 @@ import unittest
 from unittest import mock
 
 from django.core.checks.database import check_database_backends
-from django.db import connection
+from django.db import connection, connections
 from django.test import TestCase
 
 
@@ -18,6 +18,12 @@ class DatabaseCheckTests(TestCase):
 
     @unittest.skipUnless(connection.vendor == 'mysql', 'Test only for MySQL')
     def test_mysql_strict_mode(self):
+        def _clean_sql_mode():
+            for alias in self.databases:
+                if hasattr(connections[alias], 'sql_mode'):
+                    del connections[alias].sql_mode
+
+        _clean_sql_mode()
         good_sql_modes = [
             'STRICT_TRANS_TABLES,STRICT_ALL_TABLES',
             'STRICT_TRANS_TABLES',
@@ -29,6 +35,7 @@ class DatabaseCheckTests(TestCase):
                 return_value=(response,)
             ):
                 self.assertEqual(check_database_backends(databases=self.databases), [])
+            _clean_sql_mode()
 
         bad_sql_modes = ['', 'WHATEVER']
         for response in bad_sql_modes:
@@ -40,3 +47,4 @@ class DatabaseCheckTests(TestCase):
                 result = check_database_backends(databases=self.databases)
                 self.assertEqual(len(result), 2)
                 self.assertEqual([r.id for r in result], ['mysql.W002', 'mysql.W002'])
+            _clean_sql_mode()