Verwijder ALLE of bepaalde niet-afdrukbare tekens uit de kolom in mysql

DROP function IF EXISTS mysql_replaceallnonprintablecharacters; 

CREATE function mysql_replaceallnonprintablecharacters (data VARCHAR(1024)) 
returns VARCHAR(1024) 
begin 
  DECLARE i INT DEFAULT 0; 

  DECLARE finaldata VARCHAR(1024) DEFAULT ''; 

  SET FINALDATA:=data; 

  WHILE i < 31 do 
    SET FINALDATA:=REPLACE(finaldata, CHAR(i), ''); 
    SET i := i+1; 
  end WHILE; 

  RETURN finaldata; 
end