CREATE DEFINER=`root`@`localhost` FUNCTION `spiltStrings`(spiltstr varchar(2000) charset 'utf32',arrindex INT(5)) RETURNS varchar(2000) CHARSET utf32
    DETERMINISTIC
    COMMENT '逗号分隔符取回'
BEGIN 
SET @R=NULL;
SELECT CASE 
    WHEN spiltstr REGEXP CONCAT('((,).*){',arrindex,'}') 
			THEN SUBSTRING_INDEX(SUBSTRING_INDEX(spiltstr,',',arrindex+1),',',-1) 
    ELSE NULL
END into  @R;
RETURN @R;
END;