Re: [JDBC] JDBC

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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> :>
>
>
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--
Dave Cramer <Dave@micro-automation.net>