JDBC vs. Entity Bean with JBoss - Mailing list pgsql-jdbc

hi,

I'm using currently cygwin with pg7.3.2 (default installation without
optimisations), JDK1.4.1_01, JDBC driver for J2SE 1.4 und JBoss 3.0.6. I
done some test.

create 1000 entries in the same table (id field - number(20), name filed
varchar(40))

JBoss with EJB needed 54 sec.
JBoss with direct SQL needed 47 sec.

why is sql only 7 seconds faster? the CPU usage was about 12%. pg and
jboss are running on the same computer.

and here the code:

    private void createFirmSQL(ServletOutputStream out)
            throws IOException {
        Connection con = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;

        try {
            con = getConnection();

            if (con != null) {
                String query = "insert into firm values(?,?)";
                pstmt = con.prepareStatement(query);

                long start = System.currentTimeMillis();
                for (int i = 0; i < N; i++) {
                    // getUniqueLongID need for creating 1.000.000 keys
about 7 seconds.
                    pstmt.setLong(1,
SQLUtilities.getUniqueLongID().longValue());
                    pstmt.setString(2, "name " + i);
                    // commit every time like ejb
                    pstmt.executeUpdate();
                }
                long end = System.currentTimeMillis() - start;

                out.println("needed " + end + " for creating " + N + "
entries in firm table thru sql");
            }
        }
        catch (SQLException sqle) {
        }
        finally {
            SQLUtilities.getInstance().closeConnections(con, pstmt, rs);
        }
    }


    private void createFirmEJB(ServletOutputStream out)
            throws IOException {
        // testing entity beans
        ServiceLocator serviceLocator = ServiceLocator.getInstance();
        FirmLocalHome firmHome = null;

        try {
            firmHome = (FirmLocalHome)
serviceLocator.getLocalHome(JNDINamesAccess.FIRM_EJB);

            long start = System.currentTimeMillis();
            for (int i = 0; i < N; i++) {
                // firm used the same keygenerator like above
                FirmLocal firm = firmHome.create("name " + i);
            }
            long end = System.currentTimeMillis() - start;

            out.println("needed " + end + " for creating " + N + "
entries in firm table thru ejb");
        }
        catch (ServiceLocatorException sle) {
        }
        catch (CreateException ce) {
        }
    }


Best Regards,
Rafal