Обсуждение: Non-blocking SQL Execution

If your using a 1.5 JDK a  java.util.concurrent.FutureTask is a nice way to do
this.





On Monday 31 October 2005 06:57 pm, Logan Bowers wrote:
> Ah yes, I like this strategy, it will actually make things easier in my
> application for dealing with timeouts and such (since they can be
> handled in the thread).  Thanks!
>
>
>
> Logan Bowers
>
>
>
> ________________________________
>
> From: Dave Cramer [mailto:pg@fastcrypt.com]
> Sent: Monday, October 31, 2005 4:50 PM
> To: Logan Bowers
> Cc: pgsql-jdbc@postgresql.org
> Subject: Re: [JDBC] Non-blocking SQL Execution
>
>
>
> It's probably easier to create a non-blocking thread which encapsulates
> the driver
>
>
>
> And yes, the postgres driver blocks on the execute.
>
>
>
> Dave
>
> On 31-Oct-05, at 7:06 PM, Logan Bowers wrote:
>
>
>
>
>
> Hello,
>
>
>
> (sorry if this comes through twice)
>
>
>
> I'm running a web application that needs to run several queries against
> several databases
>
> to satisfy a single request.  To minimize latency I'd like to be able to
> issue
>
> "<PreparedStatement Object>.executeQuery()" on each connection, allow
> the servers to
>
> execute the queries in parallel, and then only block when I attempt to
> fetch the first
>
> row.
>
>
>
> My anecdotal experience with JDBC drivers in general are that they block
> when you attempt
>
> to execute the query, not when you attempt to retrieve data.  Is this
> the case for the
>
> Postgres driver?  Does anyone have a feel for how hard it would be to
> modify the driver
>
> allow queries to be executed in the background?  Thanks!
>
>
>
> Logan Bowers