How to split comma separated text in MySQL stored procedure

You could use a prepared statement inside the stored procedure to achieve this. You can create the whole select query as a string inside a variable and then concatenate in the comma delimited string into its IN clause. Then you can make a prepared statement from the query string variable and execute it.

DELIMITER ;;
create procedure testProc(in listString varchar(255))

BEGIN

set @query = concat('select * from testTable where id in (',listString,');');
prepare sql_query from @query;
execute sql_query;

END
;;

DELIMITER ;

call testProc("1,2,3");

You could try this MySql example. Before you use it, put some type safety checks in there (i.e. check id is integer, or match against regular expression before insert).

 # BEGIN split statements ids
 DECLARE current_pos INT DEFAULT 1;
 DECLARE delim CHAR DEFAULT ',';
 DECLARE current CHAR DEFAULT '';
 DECLARE current_id VARCHAR(100) DEFAULT '';;
 CREATE TEMPORARY TABLE ids (`id` VARCHAR(100));
 split_ids: LOOP
  SET current = MID(statement_ids, current_pos, 1);
  IF (current_pos = LENGTH(statement_ids)) THEN
   IF current != delim THEN SET current_id = CONCAT(current_id,current); END IF;
   INSERT INTO ids(id) VALUES (current_id);
   LEAVE split_ids;
  END IF;
  IF current = delim THEN
   INSERT INTO ids(id) VALUES (current_id);
   SET current_id = '';
  ELSE
   SET current_id = CONCAT(current_id,current);
  END IF;
  SET current_pos = current_pos+1;
 END LOOP split_ids;
 # END split statement ids

 # to check ids are correct
 SELECT * FROM ids;

 # to use the ids:
 SELECT * FROM statements WHERE id IN (SELECT id FROM ids);

This is simple as hell for MySQL:

SELECT * FROM table WHERE FIND_IN_SET(table.id, commaSeparatedData);

Reference: http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_find-in-set