Mysql function call

Question

If I call a function several time then will it execute every time or just execute once and the value will be used then after several time? Example:

 select my_fu         


        

Answer 1

Why not use a variable that catch the value of your function. For example:

declare var_function (datatype(size)); // just to declare proper data type for your function

set var_function = my_function('filed');

select var_function, var_function/field2, 
        (var_function*field1)/field3,

....from my_table    where group by filed1;

in that case, you'll be going to reuse the function result and no need to repeat the process of the function.