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