Procedimento armazenado do mySQL para dividir strings por delimitador

mysql> delimiter //
mysql> CREATE PROCEDURE SPLIT(IN strToSplit text, IN strDelimiter varchar(1), IN nPartToGet int,OUT strSlice varchar(255))
    -> BEGIN
    -> SET strSlice = replace(substring(substring_index(strToSplit, strDelimiter,
    -> nPartToGet),     length(substring_index(strToSplit,strDelimiter, 
    -> nPartToGet - 1)) + 1), strDelimiter, '');
    -> END
    -> //
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter ;
mysql> CALL SPLIT('1;2;3;4;5',';',3,@str);
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT @str;
+------+
| @str |
+------+
| 3    |
+------+
1 row in set (0.00 sec)