Simple case insensitive search replace wordpress meta values

gistfile1.txt

SET @old = "Holzbraun";
SET @new = "wooden";
SET @meta_key = "color";

UPDATE wp_postmeta 
SET meta_value = REPLACE(REPLACE(meta_value,@old,@new),LOWER(@old),@new)
WHERE LOWER(meta_value) LIKE LOWER(CONCAT('%',@old,'%')) AND meta_key = @meta_key;

SELECT meta_id, post_id, meta_key, meta_value
FROM wp_postmeta
WHERE LOWER(meta_value) LIKE LOWER(CONCAT('%',@old,'%')) AND meta_key = @meta_key;