[1.7.x] Fixed #23089 -- Fixed transaction handling in two management commands.

Previously, when createcachetable and flush operated on non-default
databases, they weren't atomic.

Backport of 753a22a635 from master

django/core/management/commands/createcachetable.py

@@ -71,7 +71,7 @@ class Command(BaseCommand):
         for i, line in enumerate(table_output):
             full_statement.append('    %s%s' % (line, ',' if i < len(table_output) - 1 else ''))
         full_statement.append(');')
-        with transaction.commit_on_success_unless_managed():
+        with transaction.atomic(using=database):
             with connection.cursor() as curs:
                 try:
                     curs.execute("\n".join(full_statement))

django/core/management/commands/flush.py

@@ -62,7 +62,7 @@ Are you sure you want to do this?
 
         if confirm == 'yes':
             try:
-                with transaction.commit_on_success_unless_managed():
+                with transaction.atomic(using=db):
                     with connection.cursor() as cursor:
                         for sql in sql_list:
                             cursor.execute(sql)

docs/releases/1.6.6.txt

@@ -22,3 +22,7 @@ Bugfixes
 
 * Restored ``pre_delete``  signals for ``GenericRelation`` cascade deletion
   (`#22998 <https://code.djangoproject.com/ticket/22998>`_).
+
+* Fixed transaction handling when specifying non-default database in
+  ``createcachetable`` and ``flush``
+  (`#23089 <https://code.djangoproject.com/ticket/23089>`_).

tests/cache/tests.py

@@ -989,9 +989,11 @@ class CreateCacheTableForDBCacheTests(TestCase):
             # cache table should be created on 'other'
             # Queries:
             #   1: check table doesn't already exist
-            #   2: create the table
-            #   3: create the index
-            with self.assertNumQueries(3, using='other'):
+            #   2: create savepoint
+            #   3: create the table
+            #   4: create the index
+            #   5: release savepoint
+            with self.assertNumQueries(5, using='other'):
                 management.call_command('createcachetable',
                                         database='other',
                                         verbosity=0, interactive=False)