麻烦根据sqlite数据库中的数据在Blackberry UI应用程序上推送屏幕

public MyApp()
    {   

        try {
                MyAppURI  = URI.create(\"file:///SDCard/BlackBerry/Database/\"
                        + \"MyApp.db\");
                this.setMyURI(MyAppURI);

                boolean flag = false;
                flag = DatabaseFactory.exists(getMyURI());
                if ( flag == false){
                    db = DatabaseFactory.create(getMyURI());
                    db.close();
                    new DatabaseSchema(); // this will simpaly create setting table in databse MyApp.db i am closing the database there
                    pushScreen(new Settings());
                }else{
                    db = DatabaseFactory.open(getMyURI());
                    Statement st = db.createStatement(\"select count(*) from Setting\");
                    Cursor cursor = st.getCursor();
                    if (cursor.isEmpty() == true){
                        pushScreen(new Settings());
                    }else{
                        pushScreen(new Reports());
                    }               
                }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }