Daniel Frey <d.frey@gmx.de> writes:
> after sending a COPY ... TO statement with PQsendQuery(), how can I cancel it properly?
> I tried using PQcancel(),
That's the correct way.
> but it seems to have no effect. Calling PQgetCopyData() or PQgetResult() afterwards does not go into a failure state.
AndI don't want to call PQgetCopyData() until it returns -1, as this might be a lot of data being read from the server
thatI don't need.
You can't expect instantaneous response to a cancel. For one thing, the
server might have already stuffed a good deal of data down the pipe.
You should keep pulling (and discarding) data until you get the end
or error response.
regards, tom lane