static Connection con = null;   
................
   public void updateTManager(String vFlag) throws SQLException {
        PreparedStatement stmt_UpdtTManager_p = null;
        ResultSet rsetTManager = null;
        if (con == null)
            getDBConnection();
        try {
            stmt_UpdtTManager_p = 
                    con.prepareStatement("UPDATE RC.ADO_TManager SET dfADO= ?");
            stmt_UpdtTManager_p.setString(1, vFlag); 
            stmt_UpdtTManager_p.executeUpdate(); // execute update statement for RC.ADO_TManager
        } catch (SQLException ex) {
            System.err.println("SQLException on updateTManager(): " + 
                               ex.getMessage());
        } finally {
            stmt_UpdtTManager_p.close();
        }
    } // updateTManager()   
	......................
	
 public boolean getDBConnection() {
        while (con == null) {
            try {
                // Load the Oracle JDBC driver
                op.append("Connecting DB......." + "\n");
                logger.info("Connecting DB.......");


                DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

                Properties info = new Properties();
                info.put("user", username.getText());
                info.put("password", password.getText());

                System.out.println("Connecting DB.......");
                // Connect to the database
                con = DriverManager.getConnection(url.getText().trim(), info);
 
                op.append("DB Connected." + "\n");
                System.out.println("DB Connected.");
                logger.info("DB Connected.");

            } catch (SQLException ex) {
                System.err.println("SQLException on getDBConnection(): " + 
                                   ex.getMessage());
            } finally {
                if (con == null) {
                    System.out.println("Failed connection");
                    return false;
                }
            }
        }
        return true;

    } // getDBConnection