Mysql data summation and updating

Values (r_company, priceSum) SELECTr_company, sum (price) FROMt_orderGROUPBYr_company; END: Insert the data filtering sum in the t_order table into t_order_pricesum, but execute the function after the t_order is updated, data cannot be updated because of the original value. how can we update data without deleting the data in the t_order_pricesum table. Mysql

BEGIN
Insert into t_order_pricesum (r_company, priceSum)
SELECT r_company, sum (price) FROM t_order group by r_company;

END

I sum the data in the t_order table and insert it into t_order_pricesum,
However, after t_order is updated, the function will be executed again, because the original value is available and cannot be updated,
To update the data without deleting the data in the t_order_pricesum table.