Ensure cursors are closed when no longer needed.

This commit touchs various parts of the code base and test framework. Any
found usage of opening a cursor for the sake of initializing a connection
has been replaced with 'ensure_connection()'.

1 files changed, 8 insertions, 8 deletions

diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index 3c8f170b7d..2adfbacaa9 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -122,14 +122,14 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         rule out support for STDDEV. We need to manually check
         whether the call works.
         """
-        cursor = self.connection.cursor()
-        cursor.execute('CREATE TABLE STDDEV_TEST (X INT)')
-        try:
-            cursor.execute('SELECT STDDEV(*) FROM STDDEV_TEST')
-            has_support = True
-        except utils.DatabaseError:
-            has_support = False
-        cursor.execute('DROP TABLE STDDEV_TEST')
+        with self.connection.cursor() as cursor:
+            cursor.execute('CREATE TABLE STDDEV_TEST (X INT)')
+            try:
+                cursor.execute('SELECT STDDEV(*) FROM STDDEV_TEST')
+                has_support = True
+            except utils.DatabaseError:
+                has_support = False
+            cursor.execute('DROP TABLE STDDEV_TEST')
         return has_support
 
     @cached_property