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Thread: jdbc + postgres

jdbc + postgres

From
Przemyslaw Bak
Date:
Hello,

I have following program:

-----------------------  CUT  ------------------------
import java.net.URL;
import java.sql.*;

....

    String url = "jdbc:postgresql://localhost/store3";
    //String url = "jdbc:postgresql:store3";
    Connection db;
    Statement st;

TillInfo () {
    try {
        System.err.println ( "Loading driver ..." );
        Class.forName ("postgresql.Driver");
    } catch (java.lang.ClassNotFoundException e) {
        System.err.print ("ClassNotFoundException:");
        System.err.println (e.getMessage());
    }

    try {
        System.err.println ( "Connecting ..." );
        db = DriverManager.getConnection (url,"przemol","przemol");
        System.err.println ( "Preparing statement ..." );
        st = db.createStatement ();
        System.err.println ( "Executing query ..." );
        ResultSet rs = st.executeQuery (query);
        if (rs != null) {
            ....
        }
        st.close ();
        db.close ();
    } catch (SQLException ex) {
        System.err.println ( "SQLState:" + ex.getSQLState() );
        System.err.println ( "Message:" + ex.getMessage() );
        System.err.println ( "Vendor:" + ex.getErrorCode() );
    }
}

------------------ CUT ------------------

While running I have message:

Loading driver ...
Connecting ...
SQLState:null
Message:Connection failed: java.net.ConnectException: Connection refused
Vendor:0
Exception occurred during event dispatching:
java.lang.ArithmeticException: / by zero
    at PanelChart.paint(PanelChart.java:11)
    at java.awt.Component.dispatchEventImpl(Component.java:1401)
    at java.awt.Component.dispatchEvent(Component.java:1382)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:63)


Could you tell me whats wrong with my program ?
Do I have to change sources ? If so can you tell me how ?
I use jdbc driver from postgres 6.3.2 sources and jdk 1.1.3.
Of course postgres is running :))


przemol

Re: [GENERAL] jdbc + postgres

From
Peter T Mount
Date:
On Tue, 20 Oct 1998, Przemyslaw Bak wrote:
> While running I have message:
>
> Loading driver ...
> Connecting ...
> SQLState:null
> Message:Connection failed: java.net.ConnectException: Connection refused

This seems to be the most common problem ;-)

You are not running the backend with the -i arg, which turns on tcp/ip.

Check the FAQ.

Peter

--
       Peter T Mount peter@retep.org.uk
      Main Homepage: http://www.retep.org.uk
PostgreSQL JDBC Faq: http://www.retep.org.uk/postgres
 Java PDF Generator: http://www.retep.org.uk/pdf

Re: [GENERAL] jdbc + postgres

From
Przemyslaw Bak
Date:
On Tue, 20 Oct 1998, Peter T Mount wrote:

> > Message:Connection failed: java.net.ConnectException: Connection refused
>
> This seems to be the most common problem ;-)
>
> You are not running the backend with the -i arg, which turns on tcp/ip.

Thank you. Two characters more and everything works great.
I need to come back to basic school ...

>
> Check the FAQ.

Which one: java or postgres ?


przemol

Re: [GENERAL] jdbc + postgres

From
Peter T Mount
Date:
On Wed, 21 Oct 1998, Przemyslaw Bak wrote:

> On Tue, 20 Oct 1998, Peter T Mount wrote:
>
> > > Message:Connection failed: java.net.ConnectException: Connection refused
> >
> > This seems to be the most common problem ;-)
> >
> > You are not running the backend with the -i arg, which turns on tcp/ip.
>
> Thank you. Two characters more and everything works great.
> I need to come back to basic school ...
>
> >
> > Check the FAQ.
>
> Which one: java or postgres ?

The Postgresql jdbc one...

--
       Peter T Mount peter@retep.org.uk
      Main Homepage: http://www.retep.org.uk
PostgreSQL JDBC Faq: http://www.retep.org.uk/postgres
 Java PDF Generator: http://www.retep.org.uk/pdf