Make mysql's CursorWrapper a contextmanager.

django/db/backends/mysql/base.py

@@ -152,6 +152,14 @@ class CursorWrapper(object):
     def __iter__(self):
         return iter(self.cursor)
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type, value, traceback):
+        # Ticket #17671 - Close instead of passing thru to avoid backend
+        # specific behavior.
+        self.close()
+
 
 class DatabaseFeatures(BaseDatabaseFeatures):
     empty_fetchmany_value = ()
@@ -461,7 +469,7 @@ class DatabaseWrapper(BaseDatabaseWrapper):
         return conn
 
     def init_connection_state(self):
-        with self.connection.cursor() as cursor:
+        with self.cursor() as cursor:
             # SQL_AUTO_IS_NULL in MySQL controls whether an AUTO_INCREMENT column
             # on a recently-inserted row will return when the field is tested for
             # NULL.  Disabling this value brings this aspect of MySQL in line with

tests/requests/tests.py

@@ -725,7 +725,7 @@ class DatabaseConnectionHandlingTests(TransactionTestCase):
         # request_finished signal.
         response = self.client.get('/')
         # Make sure there is an open connection
-        self.connection.ensure_connection()
+        connection.ensure_connection()
         connection.enter_transaction_management()
         signals.request_finished.send(sender=response._handler_class)
         self.assertEqual(len(connection.transaction_state), 0)