Re: [GENERAL] 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@pereira.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@pereira.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();
:> > :>
:> > :>     }
:> > :>
:> > :>
:> > :> }
:> > :>
:> > :>
:> > :>
:> > :>
:> > :>
:> > :>
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:> > :>
:> > :> http://archives.postgresql.org
:> > :>
:> >
:> >
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:> --
:> Dave Cramer <Dave@micro-automation.net>
:>
:>
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