Geometry objects and stored procedures

[Simon Giddings]

I am writing a stored procedure to select elements from a table containing a geometry field.
The select statement will do a comparison between the POINT data in the geometry field and a POLYGON which is passed to it.

My choice is either to
a) pass the content of the polygon as a string into the SP and then create the polygon geometry within the SP -
create procedure MyProc(polybounds BLOB)
begin
-- create a geometry object
declare poly GEOMETRY;
-- create the polygon object from the correctly formatted
-- passed in string "POLYGON((lat lng, lat lng, lat lng, ....))"
set poly = PolygonFromText(polybounds);
-- call the select
select .....
from mytable as m where MBRContains(poly, m.mypoint);
end $$

or
b) create the polygon geometry on the command line when passing it into the SP
create procedure MyProc(poly GEOMETRY)
begin
-- call the select
select .....
from mytable as m where MBRContains(poly, m.mypoint);
end $$
Where the command line call would be -
call MyProc(PolygonFromText("POLYGON((...))");

Can anyone advise me as to which option would be the most efficient on the server ?