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SV: InstantDB: No Rows Fetched - SQL Exception


Hey

Note that the stmt.close() after your rs = stmt.executequery(sql), this will
close the Resultset and this why you can't make a next on the Resultset.
This is also from the jdbc specs.
And if you want to have two Resultsets open at a time, you should have a new
Statement as the Statement only have one open Resultset at a time (also jdbc
spec).

A other way is to rewrite your query, maybe like this:

SELECT (fwd_bandwidth+bwd_bandwidth) FROM sdr WHERE link_id in (SELECT
link_id FROM link_info)


One could make this in a join, I think it should look something like this:

SELECT (fwd_bandwidth+bwd_bandwidth) FROM sdr,(SELECT link_id FROM
link_info) as T where sdr.link_info=T.link_info


Hope this helps you.

Regrads,
Martin



-----Oprindelig meddelelse-----
Fra: owner-instantDB@enhydra.org [mailto:owner-instantDB@enhydra.org]På
vegne af Johan Stuyts
Sendt: 20. december 2000 08:49
Til: instantDB@enhydra.org
Emne: Re: InstantDB: No Rows Fetched - SQL Exception


I think there are two problems with your code. First you should call
'next()' on
a result set before accessing the first row. You forget to do that with
'rs1'.
Second, InstantDB can only have one result set open at the same time. As you
alredy have 'rs' open, you can't use 'rs1'. Being able to have at most one
result
set open at the same time is compliant with the JDBC specification (although
some
implementations allow multiple result sets to be open). This behaviour is
documented in the InstantDB documentation.

To solve your problem you would have to iterator over all the rows of 'rs'
and
store the data in a container, e.g. 'java.util.Vector'. Then for each item
in the
container execute the nested query.

Johan Stuyts

p singh wrote:

> Hi,
>    I am using instantDb 3.12 version. In my code, I
> execute nested SELECT queries.
> My first query executes the data as expected. But the
> second query throws an
> exception with the message "No rows fetched". SQL code
> = 0 and state = null.
> What causes the instantDB JDBC driver to throw that
> exception. I know there is
> data in the table that I query. I have another sample
> program which retrives the data
> successfully.
> Exception is thrown when it tries to execute rs.next()
> code.
>
> Nested query looks somewhat like this (not the exact
> code)
>
> sql = "SELECT link_id FROM link_info";
> rs = stmt.executequery(sql);
> stmt.close();
>
> try
> {
>    while (rs.next())
>    {
>       sql = "SELECT (fwd_bandwidth+bwd_bandwidth) FROM
> sdr";
>       sql = sql + " WHERE link_id=" + rs.getString(1);
>       rs1 = stmt.executeQuery(sql);
>      System.out.println(rs1.getString(1));
>       rs1.close();
>    }
>  }
>  catch (SQLException se)
> {
>   ....
> }
>
> I appreciate any help.
>
> Cheers,
> Pramod
> Mantra
>
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