mysql smart stored procedure

Create stored procedure:

 CREATE procedure ordertotal(
in onumber int, 
in taxable boolean, 
out ototal decimal(8,2) 
) COMMENT 'Obtain order total,optionally adding tax'
begin
DECLARE total decimal(8,2); 
declare taxrate int DEFAULT 6; 
SELECT  sum(item_price * quantity) from orderitems where order_num = onumber into total; 
if taxable then 
SELECT total+(total/100*taxrate) into total; 
end if; 
SELECT total into ototal;

end;

Call stored procedure: taxable is true

call ordertotal(20005,1,@total );

SELECT @total;

Call stored procedure: taxable is false

call ordertotal(20005,1,@total);

SELECT @ total;

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