diff options
Diffstat (limited to 'django/db/models/sql/query.py')
| -rw-r--r-- | django/db/models/sql/query.py | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py index 0a9092d77d..79bb2bafbf 100644 --- a/django/db/models/sql/query.py +++ b/django/db/models/sql/query.py @@ -1743,9 +1743,11 @@ class BaseQuery(object): iterator over the results if the result_type is MULTI. result_type is either MULTI (use fetchmany() to retrieve all rows), - SINGLE (only retrieve a single row), or None (no results expected, but - the cursor is returned, since it's used by subclasses such as - InsertQuery). + SINGLE (only retrieve a single row), or None. In this last case, the + cursor is returned if any query is executed, since it's used by + subclasses such as InsertQuery). It's possible, however, that no query + is needed, as the filters describe an empty set. In that case, None is + returned, to avoid any unnecessary database interaction. """ try: sql, params = self.as_sql() |