Re:

Karl,

Can you send us a small test case which replicates the problem?

Dave
On Mon, 2002-11-04 at 12:05, Karl Goldstein wrote:
> Hello,
>
> I am having a problem with queries that return empty result sets.  Whenever
> I execute a query that returns no rows, the driver throws a SQLException:
>
> No results were returned by the query.
>         at
> org.postgresql.jdbc1.AbstractJdbc1Statement.executeQuery(AbstractJdbc1Statem
> ent.java:157)
>         at
> org.postgresql.jdbc1.AbstractJdbc1Statement.executeQuery(AbstractJdbc1Statem
> ent.java:141)
>
> I'm assuming this is not the intended behavior, since it's perfectly
> reasonable for a query to return an empty result set.
>
> Looking at the source code for AbstractJdbc1Statement and working backwards,
> the following seems to be happening:
>
> 1) executeQuery() starts looping over the current results until it finds one
> that is "really" a result set
> 2) either AbstractJdbc1ResultSet.getNext() never returns a non-null result,
> or AbstractJdbc1ResultSet.reallyResultSet() never returns true (I didn't
> track it down that far).
> 3) looking at AbstractJdbc1ResultSet.getNext(), it simply returns the next
> member variable
> 4) I didn't track down where the AbstractJdbc1ResultSet.next() method is
> called, but this statement on line 65 caught my eye:
>
>  if (++current_row >= rows.size())
>                         return false;
>
> However, I'm not sure this is related at all since the "next" member
> variable gets set by the append(), and I didn't track down where that is
> called.
>
> Any advice on this would be appreciated.
>
> Thanks
>
> Karl
>
>
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