interupt JDBC SQL query connection

Hi

I using Java and JDBC to connect to MS SQL server 2000 (using the MS
drivers msbase,msutil and mssqlserver.jars).

Sometimes it takes a long time for statement.executeQuery
to return and start returning the resultset
(full DB scan can take 30-40 minutes).

Does anyone know if it's possible to interupt/halt the query before
it eventually comes back. The setQueryTimeout works OK but this has to be
set quite high to allow real queries to run correctly. What I'm trying
to do is allow users to halt their query if they've realised they
want to alter it or its taking too long. The query is running in a
separate thread and I've tried using the main thread to close the
connection or stop the query but this still waits until the resultset
is returned.

Maybe it's a driver issue or ....

Thanks
MikeHi

I am not sure about the JDBC driver itself, but you could use a timer thread
to kill it off.

John

"Mike Read" <mar@.roe.ac.uk> wrote in message
news:Pine.OSF.4.58.0406091501320.263861@.reaxp06.ro e.ac.uk...
> Hi
> I using Java and JDBC to connect to MS SQL server 2000 (using the MS
> drivers msbase,msutil and mssqlserver.jars).
> Sometimes it takes a long time for statement.executeQuery
> to return and start returning the resultset
> (full DB scan can take 30-40 minutes).
> Does anyone know if it's possible to interupt/halt the query before
> it eventually comes back. The setQueryTimeout works OK but this has to be
> set quite high to allow real queries to run correctly. What I'm trying
> to do is allow users to halt their query if they've realised they
> want to alter it or its taking too long. The query is running in a
> separate thread and I've tried using the main thread to close the
> connection or stop the query but this still waits until the resultset
> is returned.
> Maybe it's a driver issue or ....
> Thanks
> Mike|||how many people here get the luxery of creating and maintaining apps in
jbuilder and together everyday? care to share any stories, either great
or not so great! i just got an eval of the latest and greatest installed
and after using previous versions for years, what i see now looks really
great. just was wondering about your experiences.

cheers

- perry|||I'm just new in the Java World and also JBuilder X Enterprise IDE. I'm
making a servlet client , using Struts , because the MVC pattern is just what
we need for our application.
Until now this is working just fine. I like the IDE, autocompletion, colors,
indent, etc.
The progam gives a lots of tips and help using class, packages, etc.

Greetings....

In comp.lang.java perry <perry@.cplusplus.org> wrote:
: how many people here get the luxery of creating and maintaining apps in
: jbuilder and together everyday? care to share any stories, either great
: or not so great! i just got an eval of the latest and greatest installed
: and after using previous versions for years, what i see now looks really
: great. just was wondering about your experiences.

: cheers

: - perry

--
Alfredo Diaz
================
School of Engineering and Science, University of Chile
Beaucheff 850, P.O. Box 2777, Santiago, CHILE
mailto:aadiaz@.dcc.uchile.cl.nospam|||Mike Read (mar@.roe.ac.uk) writes:
> I using Java and JDBC to connect to MS SQL server 2000 (using the MS
> drivers msbase,msutil and mssqlserver.jars).
> Sometimes it takes a long time for statement.executeQuery
> to return and start returning the resultset
> (full DB scan can take 30-40 minutes).
> Does anyone know if it's possible to interupt/halt the query before
> it eventually comes back. The setQueryTimeout works OK but this has to be
> set quite high to allow real queries to run correctly. What I'm trying
> to do is allow users to halt their query if they've realised they
> want to alter it or its taking too long. The query is running in a
> separate thread and I've tried using the main thread to close the
> connection or stop the query but this still waits until the resultset
> is returned.

You will have to examine the documetation for the JDBC driver. Most
client APIs for SQL Server supplies functions for asynchronous calls.
With a asynch call, you could then issue a cancel request (again this
is offered by most client APIs).

microsoft.public.sqlserver.jdbcdriver may offer more exact answers with
regards to that driver.

--
Erland Sommarskog, SQL Server MVP, esquel@.sommarskog.se

Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techin.../2000/books.asp