From: Nick Rathke <render@uswest.net>
To: pgsql-interfaces@postgresql.org
Subject: Postgresql JDBC errors
Date: Mon, 17 Apr 2000 22:16:54 -0600
Message-ID: <38FBE1B6.686BBA95@uswest.net> (raw)
I an using Postgresql-6.5.3 with jdbc6.5-1.2 and jdk1.2.2 on redhat
linux 6.2 . I
have tried to check the jdbc link using JDBCtest.java. Here is the info.
my classpath is
CLASSPATH=/lib/jdbc6.5-1.1.jar
JDBCtest.java
/*
This file is part of the tutorial in Chapter 3 of "Getting Started
with Enhydra".
It is not meant to be used in any other context.
Simple program to test JDBC connectivity. Assumes you have created
and populated
a table called LE_TUTORIAL_DISCS in your database.
Edit the connection string in the call to
DriverManager.getConnection()/
*/
import java.sql.*;
public class JDBCTest {
public static void main( String[] args ) {
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
// Load the driver, get a connection, create statement, run query, and
print.
try {
Class.forName("postgresql.Driver");
// Replace parameters below your database connection string,
username, and password
con = DriverManager.getConnection("jdbc:postgresql:dbtest"
,"appserver", "appserver" );
stmt = con.createStatement();
rs = stmt.executeQuery("SELECT * FROM LE_TUTORIAL_DISCS");
rs.next();
System.out.println("Title = " + rs.getString("title") + " -- Artist =
" + rs.getString("artist"));
}
catch(ClassNotFoundException e) {
System.err.println("Couldn't load the driver: " + e.getMessage());
}
catch(SQLException e) {
System.err.println("SQLException caught: " + e.getMessage());
}
}
}
which gives me the errors:
Exception in thread "main" java.lang.NullPointerException:
at
postgresql.jdbc2.ResultSet.getString(ResultSet.java:148)
at
postgresql.jdbc2.ResultSet.getString(ResultSet.java:531)
at JDBCTest.main(JDBCTest.java:25)
I don't know enough about Java or databases to make any sense of this.
Any help would be great.
Nick Rathke
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To: pgsql-interfaces@postgresql.org
Cc: render@uswest.net
Subject: Re: Postgresql JDBC errors
In-Reply-To: <38FBE1B6.686BBA95@uswest.net>
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