PostgreSQL 9.3的REFRESH MATERIALIZED VIEW命令仅持续Django连接的时间

Question

I've got a materialized view in PostgreSQL that I would like to update periodically. When I try to update it manually from the Django manage.py shell, the command to refresh the materialized view successfully completes, but the changes seem to disappear after I leave the shell. For example, on my first session, these are the commands that I run:

>>> Model.objects.get(...).subscribers.count
2L
>>> RefreshMaterializedViews()
>>> Model.objects.get(...).subscribers.count
3L

I then exit from the shell, go back in, and run the query again:

>>> Model.objects.get(...).subscribers.count
2L

The RefreshMaterializedViews function is written like this:

def RefreshMaterializedViews():
    for materialized_view in MATERIALIZED_VIEWS:
        cursor = connection.cursor()

        try:
            cursor.execute("REFRESH MATERIALIZED VIEW %s;" % materialized_view)
        finally:
            cursor.close()

So, it seems that PostgreSQL only bothered to refresh the materialized view for the current connection. On the other hand, going into the database shell itself and simply running REFRESH MATERIALIZED VIEW xxx; works.

Answer 1

好像您忘记了：

connection.commit()