Re: [JDBC] JDBC

Hi Jeffrey, Dave and All,

Thanks for your answer, I got it running!

Thanks and Best Regards,

Marcelo Pereira

-- Remember that only God and ^[:w saves.
__
(_.\ © Marcelo Pereira |
/ / ___ marcelo(at)pereira(dot)com |
/ (_/ _ \__ [Math|99]-IMECC |
_______\____/_\___)___Unicamp_______________/

--- Dave Cramer, with his fast fingers, wrote:

:> Marcelo,
:>
:> Just type
:>
:> java TestPostreSQL
:>
:> to run it
:>
:> Dave
:> On Wed, 2003-01-15 at 08:08, Marcelo Pereira wrote:
:> > Hi Jeffrey,
:> >
:> > Thanks for your example code. I have compiled it without any problem, but
:> > when I try to run I have the following:
:> >
:> > $ javac TestPostgreSQL.java
:> > $ java TestPostgreSQL.class
:> > Exception in thread
:> > "main" java.lang.NoClassDefFoundError: TestPostgreSQL/class
:> >
:> > $ java -classpath
:> > /usr/local/pgsql/share/java/postgresql.jar:. TestPostgreSQL.class
:> > Exception in thread
:> > "main" java.lang.NoClassDefFoundError: TestPostgreSQL/class
:> >
:> > $ export CLASSPATH=/usr/local/pgsql/share/java/postgresql.jar:.
:> > $ java TestPostgreSQL.class
:> > Exception in thread
:> > "main" java.lang.NoClassDefFoundError: TestPostgreSQL/class
:> >
:> > As you can see I have this problem, whatever I try to do. So I thought my
:> > JDBC driver wasn't properly compiled, so I have downloaded the 7.3 JDBC
:> > driver from PostgreSQL.org (pg73jdbc1.jar) and run all the tests above,
:> > always with the same problem.
:> >
:> > What am I doing wrong??
:> >
:> > Thanks in advance and
:> > Best Regards,
:> >
:> > Marcelo Pereira
:> >
:> > -- Remember that only God and ^[:w saves.
:> > __
:> > (_.\ © Marcelo Pereira |
:> > / / ___ marcelo(at)pereira(dot)com |
:> > / (_/ _ \__ [Math|99]-IMECC |
:> > _______\____/_\___)___Unicamp_______________/
:> >
:> > --- Jeffrey Melloy, with his fast fingers, wrote:
:> >
:> > :> Marcelo Pereira wrote:
:> > :>
:> > :> >Would you send to me a really simple example java source code using jdbc,
:> > :> >acessing a simple table at PostgreSQL
:> > :> >
:> > :>
:> > :> Giving credit where credit is due, this is Mark Liyanage's simple java
:> > :> program, from www.entorpy.ch. It was written for OS X, but there
:> > :> shouldn't be a problem.
:> > :>
:> > :> /*
:> > :> * TestPostgreSQL.java
:> > :> *
:> > :> *
:> > :> * History:
:> > :> *
:> > :> * When Who What
:> > :> * ==============================================================================
:> > :> * 2001-06-23 Marc Liyanage First version
:> > :> *
:> > :> *
:> > :> * License:
:> > :> *
:> > :> * Copyright abandoned 2001 by Marc Liyanage
:> > :> * Do with this whatever you want.
:> > :> *
:> > :> */
:> > :>
:> > :> import java.sql.*;
:> > :>
:> > :> /**
:> > :> * The TestPostgreSQL class shows how to access the PostgreSQL
:> > :> * DB server on Mac OS X using the JDBC interface.
:> > :> * It assumes the installation has been performed according
:> > :> * to the instructions at http://www.entropy.ch/software/macosx/postgresql.
:> > :> *
:> > :> *
:> > :> * You compile it like this:
:> > :> *
:> > :> * % javac TestPostgreSQL.java
:> > :> *
:> > :> * Make sure that the PostgreSQL server has been
:> > :> * started with the -i flag. This is not the case in
:> > :> * the example lines of the installation instructions mentioned
:> > :> * above and in the StartupItem package that's available
:> > :> * from the same location. The -i flag tells the DB server
:> > :> * to listen for connection requests from the network
:> > :> * and I have left it off by default for security reasons.
:> > :> *
:> > :> * If the server is running correctly (with -i), run the Test like this:
:> > :> * (in the same directory where you compiled the example)
:> > :> *
:> > :> * % java -classpath /usr/local/pgsql/share/java/postgresql.jar:. TestPostgreSQL
:> > :> *
:> > :> * You should see the current date as returned by the DB server:
:> > :> *
:> > :> * 2001-06-23 16:31:49+02
:> > :> *
:> > :> *
:> > :> * @author Marc Liyanage
:> > :> * @version 1.0
:> > :> */
:> > :> public class TestPostgreSQL {
:> > :>
:> > :>
:> > :> public static void main(String argv[]) throws Exception {
:> > :>
:> > :> // Load the driver class
:> > :> //
:> > :> Class.forName("org.postgresql.Driver");
:> > :>
:> > :> // Try to connect to the DB server.
:> > :> // We tell JDBC to use the "postgresql" driver
:> > :> // and to connect to the "template1" database
:> > :> // which should always exist in PostgreSQL.
:> > :> // We use the username "postgres" and no
:> > :> // password to connect. Since we're not accessing
:> > :> // any tables but only an SQL function
:> > :> // this should work.
:> > :> //
:> > :> Connection conn = DriverManager.getConnection(
:> > :> "jdbc:postgresql:template1",
:> > :> "postgres",
:> > :> ""
:> > :> );
:> > :>
:> > :> // Set up and run a query that fetches
:> > :> // the current date using the "now()" PostgreSQL function.
:> > :> //
:> > :> Statement stmt = conn.createStatement();
:> > :> ResultSet rset = stmt.executeQuery("SELECT now();");
:> > :>
:> > :> // Iterate through the rows of the result set
:> > :> // (obviously only one row in this example) and
:> > :> // print each one.
:> > :> //
:> > :> while (rset.next()) {
:> > :> System.out.println(rset.getString(1));
:> > :> }
:> > :>
:> > :> // Close result set, statement and DB connection
:> > :> //
:> > :> rset.close();
:> > :> stmt.close();
:> > :> conn.close();
:> > :>
:> > :> }
:> > :>
:> > :>
:> > :> }
:> > :>
:> > :>
:> > :>
:> > :>
:> > :>
:> > :>
:> > :> ---------------------------(end of broadcast)---------------------------
:> > :> TIP 6: Have you searched our list archives?
:> > :>
:> > :> http://archives.postgresql.org
:> > :>
:> >
:> >
:> > ---------------------------(end of broadcast)---------------------------
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:> >
:> > http://archives.postgresql.org
:> --
:> Dave Cramer <Dave(at)micro-automation(dot)net>
:>
:>
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