JDBC polling data sources: what's i did wrong?

Hi there,

here is a simple application which i wrote for testing purposes:

...

 Jdbc3PoolingDataSource source = new Jdbc3PoolingDataSource();
 source.setServerName("localhost");
 source.setDatabaseName("cruz");
 source.setUser("cruz");
 source.setPassword(null);
 source.setMaxConnections(5);

      Connection conn = source.getConnection();

      PreparedStatement st = conn.prepareStatement(
          "INSERT INTO test (from_addr, "
          + " to_addr, subject, body, received, message_id,in_reply_to)
values (?,?,?,?,?,?,?)"
          );
      st.setString(1, "test");
      st.setString(2, "test");
      st.setString(3, "test");
      st.setString(4, "test");
      st.setDate(5, new java.sql.Date(new Date().getTime()));
      st.setString(6,"test");
       st.setString(7,"test");

      int count = st.executeUpdate();

      st.close();

      conn.close();
    }
    catch (SQLException ex) {
      ex.printStackTrace();
    }
then code executed there are no any data that you can seen in example in the
table/// So the qestion is what's i'm doing wrong?

jdk 1.4.1_01, PostgreSQL 7.3.2, JDBC driver 7.3 build 108.