Re: Query preparation

John Lister <john(dot)lister-ps(at)kickstone(dot)com> writes:
> Oliver Jowett wrote:
>> It would be an extra network round-trip on every query, and there's no
>> requirement to prepare it early.
>>
> Just going through the code again and please correct me if i'm wrong,
> but at the moment there is unnecessary network traffic/latency. Assuming
> a PreparedStatement, every time execute is called, sendParse and
> sendDescribePortal are called (the former checks if a server side
> prepared statement has been created and aborts if so). Admittedly
> sendParse is only called as many times as setPrepareThreshold is set to
> (which admittedly may be as low as 1)

I think you're missing the cue that those are "send" operations. They
don't wait for a response to come back. In fact, assuming that the JDBC
driver is implemented the way I think, the actual data for both messages
is expected to go out as a single network packet after the driver
reaches the point of expecting a response.

regards, tom lane