ST_Round for MySQL Spatial

 DELIMITER $$
 CREATE FUNCTION `ST_Round`
 (
   p_geometry geometry,
   p_round    INT
 )
 RETURNS geometry
 BEGIN
   -- Processing steps hidden
   RETURN geometry;
 END;
 DELIMITER ;

 -- Point
 SELECT ST_AsText(ST_Round(ST_GeomFromText('POINT(100.12223 100.345456)',0),2)) AS rGeom;
 -- # rGeom
 -- 'POINT(100.12 100.35)'
 -- Point
 SELECT ST_AsText(ST_Round(ST_GeomFromText('POINT(200.00000000000088 400.00000000000045)',0),2)) AS rGeom;
 -- # rGeom
 -- 'POINT(200 400)'
 -- MultiPoint
 SELECT ST_AsText(ST_Round(ST_GeomFromText('MULTIPOINT((100.12223 100.345456),(38832.839 4949.40400))',0),2)) AS rGeom;
 -- # rGeom
 -- 'MULTIPOINT((100.12 100.12),(38832.84 38832.84))'
 -- Linestring
 SELECT ST_AsText(ST_Round(ST_GeomFromText('LINESTRING(0.1342 0.2322,1.2324 45.122)',0),2)) AS rGeom;
 -- # rGeom
 -- 'LINESTRING(0.13 0.13,1.23 1.23)'
 -- Polygon
 SELECT ST_AsText(
         ST_Round(
           ST_GeomFromText('POLYGON((160 400, 200.00000000000088 400.00000000000045, 200.00000000000088 480.00000000000017, 160 480, 160 400))',0),
           1)) AS rGeom;
 -- # rGeom
 -- 'POLYGON((160 160,200 200,200 200,160 160,160 160))'
 -- MultiPolygon
 SELECT ST_AsText(
         ST_Round(
           ST_GeomFromText('MULTIPOLYGON (((160 400, 200.00000000000088 400.00000000000045, 200.00000000000088 480.00000000000017, 160 480, 160 400)), ((100 200, 180.00000000000119 300.0000000000008, 100 300, 100 200)))',0),
           1)) AS rGeom;
 -- # rGeom
 -- 'MULTIPOLYGON(((160 160,200 200,200 200,160 160,160 160)),((100 100,180 180,100 100,100 100)))'