Fixed #7411 -- worked around some possible transaction conflicts in SQLite.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7926 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 8 insertions, 2 deletions

diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index f682c71d07..ef69d7657f 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -1616,10 +1616,16 @@ class Query(object):
 
         # The MULTI case.
         if self.ordering_aliases:
-            return order_modified_iter(cursor, len(self.ordering_aliases),
+            result = order_modified_iter(cursor, len(self.ordering_aliases),
                     self.connection.features.empty_fetchmany_value)
-        return iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)),
+        result = iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)),
                 self.connection.features.empty_fetchmany_value)
+        if not self.connection.features.can_use_chunked_reads:
+            # If we are using non-chunked reads, we return the same data
+            # structure as normally, but ensure it is all read into memory
+            # before going any further.
+            return list(result)
+        return result
 
 # Use the backend's custom Query class if it defines one. Otherwise, use the
 # default.