On Thu, Apr 13, 2006 at 11:14:57AM -0400, Greg Stark wrote: > That could be useful for applications but I think a driver really wants to > retain control of the flow of control. To make use of a callback it would have > to have an awkward dance of calling whatever function gives libpq license to > call the callback, having the callback stuff the data in a temporary space, > then checking for new data in the temporary space, and returning it to the > user.
We have an asyncronous interface. I was thinking like:
PQsendQuery( conn, query );
res = PQgetResult( conn );
gotenough = FALSE;
PQsetcallback( res, mycallback );
while( !gotenough )
PQconsumeinput(conn);
/* When we reach here we have at least five rows in our data structure */
sub mycallback(res,data)
{
/* stuff data in memory structure */
if( row_count > 5 )
gotenough = TRUE;
}
If you set non-blocking you can even go off and do other things while
waiting. No need for temporary space...
Does this seem too complex?
--
Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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