Hi Karsten,
Thank you so much, this was the problem indeed, and “connection.commit()” solved it.
Didn’t think about committing after a SELECT command.
Now I can peacefully end 2013!
Thanks and Happy New Year!
On 31 Dec 2013, at 12:07, Karsten Hilbert <Karsten.Hilbert@gmx.net> wrote:
> now() always returns the transaction start timestamp.
>
> Might that be it ?
>
> Karsten
>
> On Tue, Dec 31, 2013 at 11:44:46AM +0000, Krystian Samp wrote:
>
>> Hello everyone,
>>
>> I’ve been struggling with an issue for 2 days now and couldn’t find the answer via google search.
>>
>> here’s a method of my db class:
>>
>> def get_old_feeds( self, not_refreshed_for_secs ):
>> cursor = self.connection.cursor( cursor_factory = psycopg2.extras.RealDictCursor )
>> cursor.execute( "SELECT id, url FROM feeds WHERE refreshed_on is not NULL AND refreshed_on < ( now() -
interval'%s seconds' );", ( not_refreshed_for_secs, ) )
>> old_feeds = cursor.fetchall()
>> cursor.close()
>> return old_feeds
>>
>> there’s a loop that invokes this method every X minutes. All “old_feeds” get their value for “refreshed_on” updated
tothe current date when processed using this method:
>>
>> def set_feed_last_refresh( self, feed_id, refresh_datetime ):
>> cursor = self.connection.cursor()
>> cursor.execute( "UPDATE feeds SET refreshed_on = %s WHERE id = %s;", ( refresh_datetime, feed_id ) )
>> self.connection.commit()
>> cursor.close()
>>
>> The problem is that the select query in the first method returns some results only the first time it is run, all
subsequentexecutions give 0 results. The odd thing is that when I issue exactly the same query via pgAdmin I get the
resultsas one would expect.
>>
>> I’d highly appreciate your help with this issue,
>>
>> Thank you,
>> Krystian
>>
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