connection with sqlite does not work

I have 3 classes

first class

public class MyApp extends UiApplication {
    /**
     * Entry point for application
     *
     * @param args
     *            Command line arguments (not used)
     */
    public static void main(String[] args) {
        // Create a new instance of the application and make the currently
        // running thread the application's event dispatch thread.
        MyApp theApp = new MyApp();
        theApp.enterEventDispatcher();
    }

    /**
     * Creates a new MyApp object
     */
    public MyApp() {
        // Push a screen onto the UI stack for rendering.
        DBAdapter db=new DBAdapter();
        db.openOrCreateDatabase();
        pushScreen(new MyScreen());
    }
}

second class

public final class MyScreen extends MainScreen implements FieldChangeListener
{
    /**
     * Creates a new MyScreen object
     */
    private ButtonField addButton = new ButtonField("Add Records",
            ButtonField.CONSUME_CLICK | Field.FIELD_HCENTER);
    private ButtonField deleteButton = new ButtonField("Delete Records",
            ButtonField.CONSUME_CLICK | Field.FIELD_HCENTER);
    public MyScreen()
    {
        // Set the displayed title of the screen
        setTitle("MyTitle");
        HorizontalFieldManager hfm = new HorizontalFieldManager();
        addButton.setChangeListener(this);
        deleteButton.setChangeListener(this);
        hfm.add(addButton);
        hfm.add(deleteButton);
        add(hfm);
    }
    public void fieldChanged(Field field, int context) {
        // TODO Auto-generated method stub
        if (field == addButton) {
            DBAdapter db=new DBAdapter();
            db.insertTableData();
            String[] data=db.getCat();
        }
    }
}

third class

public class DBAdapter {

    private static String DB_NAME = "test.db";
    public Database db;
    public void openOrCreateDatabase() {
        boolean sdCardPresent = false;
        String root = null;
        Enumeration e = FileSystemRegistry.listRoots();
        while (e.hasMoreElements()) {
            root = (String) e.nextElement();
            if (root.equalsIgnoreCase("sdcard/")) {
                sdCardPresent = true;
            }
        }
        if (!sdCardPresent) {
            UiApplication.getUiApplication().invokeLater(new Runnable() {
                public void run() {
                    Dialog.alert("This application requires an SD card to be present. Exiting application...");
                    System.exit(0);
                }
            });
        } else {
            try {

                String dbLocation = "/SDCard/databases/";
                // Create URI
                URI uri = URI.create(dbLocation + DB_NAME);

                // Open or create a plain text database. This will create the
                // directory and file defined by the URI (if they do not already
                // exist).
                db = DatabaseFactory.openOrCreate(uri);
                createDatabaseSchema();
            } catch (Exception ae) {
                Dialog.alert("Error,database not created...");
            }
        }
    }

    private void createDatabaseSchema() {
        Statement st = null;
        try {
            st = db.createStatement("CREATE TABLE IF NOT EXISTS 'People' ( 'Name' TEXT, 'Age' INTEGER )");
            st.prepare();
            st.execute();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                st.close();
            } catch (DatabaseException e) {
            }
        }
    }

    public void insertTableData() {
        Statement st = null;
        try {
            st = db.createStatement("INSERT INTO People(Name,Age) VALUES (?,?)");
            st.prepare();
            Hashtable ht = new Hashtable(5);
            ht.put("Joe", new Integer(6));
            ht.put("Mike", new Integer(7));
            ht.put("Marie", new Integer(12));
            ht.put("Dennis", new Integer(14));
            ht.put("Richard", new Integer(12));
            Enumeration names = ht.keys();
            Enumeration ages = ht.elements();
            while (names.hasMoreElements()) {
                String strName = (String) names.nextElement();
                Integer iAge = (Integer) ages.nextElement();
                st.bind(1, strName);
                st.bind(2, iAge.intValue());
                st.execute();
                st.reset();
                Dialog.alert("ok");
            }
        } catch (Exception e) {
            Dialog.alert("Error");
        } finally {
            try {
                st.close();
            } catch (DatabaseException e) {
                Dialog.alert("Error");
            }
        }
    }

    public String[] getCat() {
        String[] data = {};
        if (db == null) {
            return data;
        }
        Statement st = null;
        try {
            st = db.createStatement("SELECT Id,Name FROM Cat");
            st.prepare();
            Cursor c = st.getCursor();
            if (c == null) {
                return data;
            }
            Row r;
            int i = 0;

            while (c.next()) {
                r = c.getRow();
                data[i] = r.getString(1);
                i++;
                // recordList.insert(0, r.getString(0) + " - " +
                // r.getInteger(1)+ " years old");
            }
            if (i == 0) {
                return data;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                st.close();
            } catch (Exception e) {
            }
        }
        return data;
    }
}

There is problem please help me

How do you define the instance "db" on the screen?

Tags: BlackBerry Developers

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connection with sqlite does not work

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