By adding same item to recyclerview in shopping cart its overriding

Question

How to update a recyclerview item it its already exists, in shoping cart system? when i add an item 2 times then if i delete one then the second one will appear,only after deleting the first one in android studio using java

... CartModel cart = new CartModel(namee, manufacture, avail_cart, e__pnum, m__pnum, String.valueOf(p), quantityy, String.valueOf(roundoff));
                        if (db.addToCart(cart)) {
                           // Toast.makeText(getApplicationContext(), "Product added to cart  " , Toast.LENGTH_LONG).show(); //roundoff
                            Snackbar.make(findViewById(android.R.id.content),"Product added to cart ",Snackbar.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(getApplicationContext(), "Product not added to cart", Toast.LENGTH_LONG).show();
                            Snackbar.make(findViewById(android.R.id.content),"Product not added to cart ",Snackbar.LENGTH_SHORT).show();
                        }

...

public boolean addToCart(CartModel cartModel) {


    SQLiteDatabase db = this.getWritableDatabase();


    ContentValues values = new ContentValues();
    values.put(Manufacturer, cartModel.getManufacturer());
    values.put(Availability, cartModel.getAvailability());
    values.put(E_part, cartModel.getE_part());
    values.put(M_part, cartModel.getM_part());
    values.put(Unit_price, cartModel.getUnit_());
    values.put(Quantity, cartModel.getQuantity());
    values.put(Line_total, cartModel.getLine_total());
    values.put(Name, cartModel.getName());
    return db.insert(CartDetails, null, values) > 0;


}

Answer 1

First, you need to query the database if cartModel.getName() already exists. If yes, use db.update else use db.insert .