Re: [JDBC] st.executeQuery("SELECT NEXTVAL('seq_suporte') AS valor");

You are not doing a rs.next() before rs.getInt().

Kris Jurka

On Mon, 3 Feb 2003, Elielson Fontanezi wrote:

> Hi Folks!
>
> I need some help.
> See this code parcel:
>
> ...
> ...
> ResultSet rs =
> st.executeQuery("SELECT NEXTVAL('seq_suporte') AS valor");
> ...
> ...
>
> It produces: java.lang.NullPointerException
>
> What is problem?
> I am used to do SELECT commands like this with any table Ive
> created so far,
> but with this sequence no data comes from.
> I am uncapable of guessing what can be.
>
> Id appreciate suggestions.
>
> Below there is a short program that reproduces this case.
>
> Thanks!
>
> -----------------------------------------------------------------
> import java.sql.*;
>
> class pgdbping
> {
> public static void main(String args[])
> {
> try
> {
> Class.forName("org.postgresql.Driver");
>
> Connection con = DriverManager.getConnection(
> "jdbc:postgresql://10.10.96.147:5432/suporte",
> "suporte", "suporte");
>
> System.out.println("Connection successful!!");
>
> Statement st = con.createStatement();
>
> ResultSet rs = st.executeQuery(
> "SELECT NEXTVAL('seq_suporte') AS valor");
>
> int novoCodigoSuporte =
> rs.getInt("valor");
>
> st.close();
> con.close();
> }
> catch(Exception e)
> {
> e.printStackTrace();
> }
> }
> }
>
>
> +--------------------------------------------------------+
> | _ Elielson Fontanezi (elielsonf(at)prodam(dot)sp(dot)gov(dot)br) |
> | v PRODAM - VSE Department +55 11 5080-9283 |
> | /(_)\ May your trails be crooked, winding, lonesome, |
> | ^ ^ dangerous, leading to the most amazing view. |
> | May your mountains rise into and above the clouds. |
> +--------------------------------------------------------+
>
> ---------------------------(end of broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
>
> http://www.postgresql.org/users-lounge/docs/faq.html
>