Re: NullPointerExceptions in empty ResultSets

i figured out what the problem was.

in my code, i was doing this:

resultSet.close()
[snip a whole bunch of code]
resultSet.last()
resultSet.getRow();

in the previous version of the jdbc drivers, it quietly handled last() on a
closed result set and returned 0 from getRow() on a closed result set. now,
i get a null pointer exception when i call anything on a closed result set.

i suggest this is no bug and that it actually helped me improve my code.

sorry for the false alarm.

Regards,

Floyd Shackelford
4 Peaks Technology Group, Inc. <http://www.4peakstech.com/>
VOICE: 334.735.9428
FAX: 916.404.7125
EMAIL: FloydS(at)4PeaksTech(dot)com <mailto:FloydS(at)4PeaksTech(dot)com>
ICQ #: 161371538

acta non verba

-----Original Message-----
From: pgsql-jdbc-owner(at)postgresql(dot)org
[mailto:pgsql-jdbc-owner(at)postgresql(dot)org]On Behalf Of Dave Cramer
Sent: Thursday, June 13, 2002 1:17 PM
To: floyds(at)4peakstech(dot)com
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: [JDBC] NullPointerExceptions in empty ResultSets

Try downloading the dev jar

I just tried

public void testEmptyResult()
{
try
{
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM testrs where
id=100");
rs.beforeFirst();
rs.afterLast();
assertTrue(!rs.first());
assertTrue(!rs.last());
assertTrue(!rs.next());

}
catch ( Exception ex )
{
fail( ex.getMessage() );
}

and it passed with no problem

DAve
On Thu, 2002-06-13 at 14:00, Floyd Shackelford wrote:
>
> i just upgraded to the latest jdbc driver and am now getting errors in
empty
> ResultSets (i.e. the sql select returned 0 rows) where i used to not get
an
> error. here are some examples:
>
> java.lang.NullPointerException at
> org.postgresql.jdbc2.ResultSet.beforeFirst(ResultSet.java:876)
>
> java.lang.NullPointerException at
> org.postgresql.jdbc2.ResultSet.last(ResultSet.java:1133)
>
> please let me know if this is an error and if so:
>
> 1. how do i work around it for now
> 2. when can i have a new version of the jdbc jar file?
>
> Regards,
>
> Floyd Shackelford
> 4 Peaks Technology Group, Inc.
> VOICE: 334.735.9428
> FAX: 916.404.7125
> EMAIL: FloydS(at)4PeaksTech(dot)com
> ICQ #: 161371538
> acta non verba
>
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.370 / Virus Database: 205 - Release Date: 6/5/2002
>
> ---
> Incoming mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.370 / Virus Database: 205 - Release Date: 6/5/2002
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.370 / Virus Database: 205 - Release Date: 6/5/2002

---------------------------(end of broadcast)---------------------------
TIP 5: Have you checked our extensive FAQ?

http://www.postgresql.org/users-lounge/docs/faq.html
---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.370 / Virus Database: 205 - Release Date: 6/5/2002

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.370 / Virus Database: 205 - Release Date: 6/5/2002