//instead of adding to arrays, i insert the data to sqlite database
sh.insertDateSelected(created_at, quantity, product_id, name,
                            customer_first_name, customer_last_name, customer_id, attendant_name, price, attendant_id);
//then simply call these methods from my sqlite handler class
//product_values is an array containing y-axis values
//product_labelz is an array ontaining x-axis values or labels
 product_values = sh.date_products_values(variant);
 product_labelz = sh.product_labels();