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Thread: Need help to connect to PostgreSql

  1. #1
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    Default Need help to connect to PostgreSql

    Hi all,

    I'm a java newbie and need help to connect to a postgresql database from NetBeans.
    I've managed to register the postgresql driver in service page in NetBeans and establish
    a connection to my database, but how should I do it from my code.

    This is my code copied from examples on the net:

      private void btnOpenDbActionPerformed(java.awt.event.ActionEvent evt) {                                          
        // TODO add your handling code here:
        Connection conn = null;
     
        try
        {
    //      Class.forName("???");
          conn = DriverManager.getConnection("jdbc:postgresql:5432//localhost/mapobjectdb",
                 "postgres", "secret");
        }
        catch (SQLException se)
        {
          System.out.println("Couldn't connect: print out a stack trace and exit.");
          se.printStackTrace();
          System.exit(1);
        }
     
      if (conn != null)
        System.out.println("Connected to the database!");
      else
        System.out.println("Couldn't connect");
      }
    What am I supposed to enter in Class.forName

    Regards
    stab


  2. #2
    Administrator copeg's Avatar
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    Default Re: Need help to connect to PostgreSql

    Try:
    Class.forName("org.postgresql.Driver");

  3. #3
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    Default Re: Need help to connect to PostgreSql

    Downloaded "JDBC4 Postgresql Driver, Version 9.0-801.zip", unzipped it, didn't get a jarfile, instead a filestructure like:
    postgresql-9.0-801.jdbc4
    META-INF
    org
    postgresql
    a lot subdirectories + the following files
    Driver$1.class
    Driver$ConnectThread.class
    Driver.class
    PGConnection.class
    PGNotification.class
    PGRefCursorResultSet.class
    PGResultSetMetaData.class
    PGStatement.class

    My CLASSPATH is like :
    .;C:\Projekt\Java\postgresql-9.0-801.jdbc4\org\postgresql

    Modified my code according to your suggestion to:
    try
    {
    Class.forName("org.postgresql.Driver");
    }
    catch (ClassNotFoundException se)
    {
    System.out.println("Doesn't find driver for PostgreSQL");
    se.printStackTrace();
    System.exit(1);
    }

    but I still get "Doesn't find driver for PostgreSQL"

    How am I supposed to specify the driver in Class.forName("???"); or is the error in my CLASSPATH?

  4. #4
    Administrator copeg's Avatar
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    Default Re: Need help to connect to PostgreSql

    The links on this page point to the driver jar file which should be placed on your classpath. Don't unpack/unzip this file (which it looks like you've done based upon the directory structure you posted)

  5. The Following User Says Thank You to copeg For This Useful Post:

    stab (June 3rd, 2011)

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