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Missing cursor.isready and cursor.fileno in 2.3.0
Reported by Psycopg website | November 25th, 2010 @ 11:41 AM
Submitted by: Paul Reznicek
There are no more
cursor, so that using select to wait for notify make problems.
Fileno can be used from
connection, but without
isready the waiting for notification is difficult.
Comments and changes to this ticket
- State changed from new to invalid
isready()was dropped in the async overhaul performed in psycopg 2.2 release.
fileno()was moved from the cursor to the connection, as it is the connection to wrap the socket. You can access it using
Listening for notify whould be easier than it was before 2.2: use
connection.poll()and check if there is anything new in
notifies. More efficient than continuous polling, you can use
conn.fileno()in a wait facility such as
select()and only poll when there is something to read. There is no more need for
poll()cares about it. The doc contains examples about how to use the interface.
It should be easy to adapt the code to the new interface. If it proves hard, please send a snippet with your previous listening loop and we may be able to help you (see the lighthouse help if you want to post code well formatted).
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Psycopg is the most used PostgreSQL adapter for the Python programming language. At the core it fully implements the Python DB API 2.0 specifications. Several extensions allow access to many of the features offered by PostgreSQL.