Calling a Stored Procedure properly in MySQL - mysql

Question

Here's my Stored Procedure:
DELIMITER //
CREATE PROCEDURE facturar(codigo int(6),fecha date,cedula VARCHAR(9),cantidad int(3),peso VARCHAR(10),precio varchar(10))
BEGIN
DECLARE P float;
Declare total float;
set P=0;
set total=0;
insert into factura VALUES(ID,fecha,cedula,cantidad, peso, `precio`);
set P=peso*4;
if P between 2000 and 10000 then SET precio= (P*0.05)+(P*0.12)+P;
elseif P > 10000 then set precio= (P*0.05)+(P*0.10)+(P*0.12)+P;
else set precio= (P*0.12)+P;
end if;
set total = precio;
select concat("Total de envio=", total);
END;
//
When i make the call:
call facturar (NULL,'2016/01/13', 'v18834415', '2', '96400', '');
It shows the result:
Total de envió=489712
But, once I take a look at the table the "precio" is in white while the other values are filled.

Answer 1

You are setting precio as a column in the insert. Then you do some calculations, and never do anything with the values.
I strongly encourage two of things:
indicate the difference between variables and columns by using a prefix for variables
list all columns for insert
In your case, I think you need to move the insert after you set precio:
CREATE PROCEDURE facturar(
in_codigo int(6),
in_fecha date,
in_cedula VARCHAR(9),
in_cantidad int(3),
in_peso VARCHAR(10),
in_precio varchar(10)
)
BEGIN
DECLARE #P float;
Declare #total float;
set #P = 0;
set #total = 0;
set #P = in_peso*4;
if #P between 2000 and 10000 then SET in_precio= (#P*0.05)+(#P*0.12)+#P;
elseif #P > 10000 then set in_precio= (#P*0.05)+(#P*0.10)+(#P*0.12)+#P;
else set in_precio = (#P*0.12)+#P;
end if;
set #total = in_precio;
insert into factura( . . . )
VALUES(in_ID, in_fecha, in_cedula, in_cantidad, in_peso, in_precio);
select concat('Total de envio=', #total);
END;

Answer 2

You need to execute insert query after setting the value.
DELIMITER //
CREATE PROCEDURE facturar(codigo int(6),fecha date,cedula VARCHAR(9),cantidad int(3),peso VARCHAR(10),precio varchar(10))
BEGIN
DECLARE P float;
Declare total float;
set P=0;
set total=0;
set P=peso*4;
if P between 2000 and 10000 then SET precio= (P*0.05)+(P*0.12)+P;
elseif P > 10000 then set precio= (P*0.05)+(P*0.10)+(P*0.12)+P;
else set precio= (P*0.12)+P;
end if;
set total = precio;
select concat("Total de envio=", total);
insert into factura VALUES(ID,fecha,cedula,cantidad, peso, total);
END;
//
use total variable in insert query instead of backquoted value