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Code Issues 32 Releases Wiki Activity

[1.0.X] Changed the row count value returned from update queries in some cases.

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If an update only affected an ancestor model (not the child), we were
returning 0 for the number of rows updated. This could have been
misleading if the value is used to detect an update occuring. So we now
return the rowcount from the first non-trivial query that is executed
(if any). Still a slight compromise, but better than what we had.

Backport of r9966 from trunk (turns out this *is* a bugfix, since the returned
rowcount is used in Model.save(force_update=True)).

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9969 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick 2009-03-04 05:40:22 +00:00
parent f1c9080984
commit b57d86f226
2 changed files with 10 additions and 5 deletions
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11
django/db/models/sql/subqueries.py
View File

@ -111,14 +111,19 @@ class UpdateQuery(Query):
def execute_sql(self, result_type=None):
"""
Execute the specified update. Returns the number of rows affected by
the primary update query (there could be other updates on related
tables, but their rowcounts are not returned).
the primary update query. The "primary update query" is the first
non-empty query that is executed. Row counts for any subsequent,
related queries are not available.
"""
cursor = super(UpdateQuery, self).execute_sql(result_type)
rows = cursor and cursor.rowcount or 0
is_empty = cursor is None
del cursor
for query in self.get_related_updates():
query.execute_sql(result_type)
aux_rows = query.execute_sql(result_type)
if is_empty:
rows = aux_rows
is_empty = False
return rows
def as_sql(self):

4
tests/regressiontests/model_inheritance_regress/models.py
View File

@ -271,8 +271,8 @@ True
# (regression test for #10362).
>>> article = ArticleWithAuthor.objects.create(author="fred", headline="Hey there!", pub_date = datetime.datetime(2009, 3, 1, 8, 0, 0))
>>> ArticleWithAuthor.objects.filter(author="fred").update(headline="Oh, no!")
0
1
>>> ArticleWithAuthor.objects.filter(pk=article.pk).update(headline="Oh, no!")
0
1
"""}