Lesen und schreiben in eine SQLite-Datenbank

public class ensacom1 extends Activity {        
    SQLiteDatabase myDB = null; 
    final static String MY_DATABASE_NAME = "tankpro";
    final static String MY_DATABASE_TABLE = "fahrzeuge";
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        onCreateDBAndDBTabled(); //DB und Tables erstellen wenn noch nicht vorhanden
        setContentView(R.layout.main);
    }


    private void onCreateDBAndDBTabled()
    {
        myDB = this.openOrCreateDatabase(MY_DATABASE_NAME, MODE_PRIVATE, null);
        myDB.execSQL("CREATE TABLE IF NOT EXISTS " + MY_DATABASE_TABLE
                        + " (id integer AUTO_INCREMENT PRIMARY KEY, name varchar(100), model varchar(100), bemerkungen varchar(255), kraftstoffart varchar(100))"
                        +";");
    }

//Klick auf einen Menüpunkt
    public boolean onOptionsItemSelected(MenuItem item){
        switch (item.getItemId()) {
        case MENU_SAVE:
            EditText KfzName = (EditText)findViewById(R.id.ed_fahrzeugname);
            EditText KfzModel = (EditText)findViewById(R.id.ed_fahrzeugmodel);
            EditText KfzBemerkungen = (EditText)findViewById(R.id.ed_fahrzeugbemerkung);
            Spinner KfzKraftstoffart = (Spinner)findViewById(R.id.cb_Kraftstoffarten);
                
            InsertToDB(KfzName.getText().toString(), KfzModel.getText().toString(), KfzBemerkungen.getText().toString(), KfzKraftstoffart.getSelectedItem().toString());
            Intent ifahrzeuge = new Intent(this, fahrzeuge.class);
            startActivity(ifahrzeuge);
            return true;    
        }
        return false;
    }


//Neues Fahrzeug in DB speichern       
    public void InsertToDB(String kfzName, String kfzModel, String kfzBemerkungen, String kfzKraftstoffart)
    {
        SQLiteDatabase myDB = null;
        try {
            myDB = this.openOrCreateDatabase(ensacom1.MY_DATABASE_NAME, MODE_PRIVATE, null);    
            myDB.execSQL("INSERT INTO "+ensacom1.MY_DATABASE_TABLE+" (name, model, bemerkungen, kraftstoffart) "
                                                   +"VALUES ('"+kfzName+"','"+kfzModel+"','"+kfzBemerkungen+"','"+kfzKraftstoffart+"');");
        }
        finally
        {
            if (myDB != null)
                myDB.close();
        }
    }

public class fahrzeuge extends ListActivity {
    SQLiteDatabase myDB = null; 
    ArrayList<String> results = new ArrayList<String>();  
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        
        myDB = this.openOrCreateDatabase(ensacom1.MY_DATABASE_NAME, MODE_PRIVATE, null);        
        Cursor c = myDB.rawQuery("SELECT name, model FROM " + ensacom1.MY_DATABASE_TABLE + ";", null);
        int kfzNameColumn  = c.getColumnIndex("name");
        int kfzModelColumn = c.getColumnIndex("model");
        startManagingCursor(c);
        c.moveToFirst();
     
        if (c != null) {
          if (c.isFirst()) {
                 int i = 0;
              
                 do {
                      i++;
     
                      String kfzname = c.getString(kfzNameColumn);
                      String kfzmodel = c.getString(kfzModelColumn);
                      results.add(kfzname + " - " + kfzmodel);
                 } while(c.moveToNext());
              }
        }
        this.setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, results));
    }