Re: "No results were returned by the query" exception

Tim,

Here is the good bits from your logs that you sent me.

What they are saying is that you have started a transaction and done an
insert which failed. After that the transaction needs to be committed,
or rolled back before anything can be done, even selects.

ERROR: Cannot insert a duplicate key into unique index
crawlqueue_url_idx
ERROR: Cannot insert a duplicate key into unique index
crawlqueue_url_idx
ERROR: current transaction is aborted, queries ignored until end of
transaction block

NOTICE: current transaction is aborted, queries ignored until end of
transaction block

NOTICE: current transaction is aborted, queries ignored until end of
transaction block

SQLWarning: reason(NOTICE: current transaction is aborted, queries
ignored until end of transaction block

Dave

> -----Original Message-----
> From: tlewis(at)kyle(dot)sinewave(dot)com(dot)au
> [mailto:tlewis(at)kyle(dot)sinewave(dot)com(dot)au] On Behalf Of Tim Lewis
> Sent: Thursday, March 21, 2002 11:02 PM
> To: Dave(at)micro-automation(dot)net
> Cc: 'David Hancock'
> Subject: Re: [JDBC] "No results were returned by the query" exception
>
>
> I'm not clear on what you mean by a transaction is in error?
>
> I'm not sure how a select statement returning a resultset
> with no rows should trigger an exception.
>
> Could you explain this in some more detail.
>
> Tim.
>
> Dave Cramer wrote:
>
> > Actually, this only occurs when there is an error in the query. If
> > there are no results from the query
> >
> > Ie select * from foo; returns nothing then you will get an empty
> > result set
> >
> > If on the other hand there is an error in the query like a
> transaction
> > is in error, then the exception will be thrown
> >
> > Dave
> >
> > > -----Original Message-----
> > > From: pgsql-jdbc-owner(at)postgresql(dot)org
> > > [mailto:pgsql-jdbc-owner(at)postgresql(dot)org] On Behalf Of
> David Hancock
> > > Sent: Thursday, March 21, 2002 10:00 PM
> > > To: pgsql-jdbc(at)postgresql(dot)org
> > > Subject: [JDBC] "No results were returned by the query" exception
> > >
> > >
> > > Hi,
> > >
> > > Someone recently pointed out that a SQLException is thrown when a
> > > query returns no results. I have noticed this too. It used to be
> > > the case (driver version 6.x) that an empty ResultSet was
> > > returned, and no
> > > exception thrown.
> > >
> > > This new behaviour means that the Postgres driver behaves
> > > significantly differently to other JDBC drivers, and that code
> > > written for a generic JDBC connection doesn't work as
> expected with
> > > Postgres.
> > >
> > > Is this new behaviour a bug or a feature ?
> > >
> > > regards,
> > >
> > > Dave Hancock.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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