Re: Proposal: Adding "push" semantics to copy_from

Chris Cogdon ha scritto:
> Hi folks!
> 
> I'd like to get a new extension put into psycopg2 to allow "push"  
> semantics to "copy from" operations. Ie, rather than having  
> "copy_from" be passed a file handle ("pull" semantics), it returns a  
> object where I can generate my own data and "push" it into the  
> connection to the database (with flushing and closing operations, too).
> 
> If someone want's to go ahead and just do that, that's be totally  
> fantastic! In lieu of such unbounded generosity, I'd like to do the  
> work myself and offer it as a submission to psycopg2. So, if someone  
> has submission tips before I start work on that, I'd be grateful
> 

Some time ago I have written a PostgreSQL client implementation in Twisted:
http://hg.mperillo.ath.cx/twisted/pglib/

Actually the data to be copied to the server is handled using a "pull" 
semantic (data is read from an user supplied object every reactor cycle).

However this can be changed by allowing the user supplied object to 
return a deferred; the semantic is still "pull", but the user has more 
control on when to send the data.


 > [...]


Manlio Perillo