sqlite update on fresh inserted Data fails in android

I have tried to make a shopping basket. I've inserted some items into the basket Table but when i try to update my frsh inserted data nothing happens :( After restarting my App i can update the count as much as i want.

I hope somebody can help me

private SQLiteDatabase myDB = null;
    public void addWarenkorb(Produkt prod, MainActivity mainActivity) 
{
    try
    {
        myDB = mainActivity.openOrCreateDatabase(DB_NAME, Context.MODE_PRIVATE, null);
    /*  ContentValues insert = new ContentValues();
        insert.put("produkt_id",prod.getId());
        insert.put("count",prod.getCount());*/
        myDB.beginTransaction();
//      myDB.insertOrThrow("warenkorb", null, insert);
        myDB.execSQL("INSERT INTO warenkorb (produkt_id, count) VALUES("+prod.getId()+", "+prod.getCount()+");");
        myDB.setTransactionSuccessful();
        myDB.endTransaction();
        myDB.close();
    }
    catch(Exception e)
    {

        System.out.println("saveDB: "+e);
    }
    finally
    {
        if(myDB !=null)
            myDB.close();
    }   
}

public void newCount(Integer value, int position, MainActivity mainActivity) 
{
    try{
        myDB = mainActivity.openOrCreateDatabase(DB_NAME, Context.MODE_PRIVATE, null);
        myDB.beginTransaction();
        myDB.execSQL("UPDATE warenkorb SET Count="+value+" WHERE id="+position);
        myDB.setTransactionSuccessful();
        myDB.endTransaction();
        myDB.close();
    }
    catch(Exception e)
    {
        System.out.println("getProduktID: "+e);
    }
    finally
    {
        if(myDB !=null)
            myDB.close();
    }
}