Question

I have a MySQL Cursor, but I need to set it as read-only and not-scrollable, but how can I set it in the stored procedure?

My stored procedure looks like

DROP PROCEDURE IF EXISTS `GetAllNonprocessedSMSes` €€
CREATE PROCEDURE `GetAllNonprocessedSMSes`()
   BEGIN
      ...
      DECLARE id_cur CURSOR FOR
         SELECT `id` FROM (
            SELECT
               MIN(`id`) AS `id`
            FROM
               `inbox`
            WHERE
               `Processed`='false'
               AND `udh`=''
         ) AS `baseview`
      ORDER BY `id`;

      DECLARE CONTINUE HANDLER FOR NOT FOUND SET finish = TRUE;

      OPEN id_cur;
      the_loop : LOOP
         FETCH id_cur INTO smsid;
         ...
      END LOOP the_loop;

      ...
   END €€

Answer 1

You don’t mention which version of MySql you are using, but according to the MySQL 5.0 reference manual:

“MySQL supports cursors inside stored programs. The syntax is as in embedded SQL. Cursors have these properties:
– Asensitive: The server may or may not make a copy of its result table
– Read only: Not updatable
– Nonscrollable: Can be traversed only in one direction and cannot skip rows”

Therefore, I would say that MySql cursors are, by definition, read-only AND nonscrollable !