mirrors/django
mirrors/django
0
0
Fork 0
mirror of https://github.com/django/django.git synced 2024-11-29 22:56:46 +01:00
Code Issues Releases Wiki Activity

Fixed #30904 -- Doc'd caveat about using filtered queryset with select_for_update() on MySQL.

Browse Source
This commit is contained in:
Saad 2019-10-25 00:39:12 +03:00 committed by Mariusz Felisiak
parent 05c3ef26a2
commit fc2b1cc926
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
docs/ref/databases.txt
View File

@ -630,6 +630,11 @@ the ``SELECT ... FOR UPDATE`` statement. If ``select_for_update()`` is used
with ``nowait=True``, ``skip_locked=True``, or ``of`` then a
:exc:`~django.db.NotSupportedError` is raised.
When using ``select_for_update()`` on MySQL, make sure you filter a queryset
against at least set of fields contained in unique constraints or only against
fields covered by indexes. Otherwise, an exclusive write lock will be acquired
over the full table for the duration of the transaction.
Automatic typecasting can cause unexpected results
--------------------------------------------------