USE provisioning;
SET autocommit=0;

CREATE TABLE `autoprov_firmwares_data` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  fw_id int(11) unsigned NOT NULL,
  `data` longblob NOT NULL,
  PRIMARY KEY (`id`),
  KEY `afd_fw_id_idx` (`fw_id`),
  CONSTRAINT `fk_fw_idx` FOREIGN KEY (`fw_id`) REFERENCES `autoprov_firmwares` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB;

DELIMITER ;;
CREATE PROCEDURE split_autoprov_firmware_data()
BEGIN

    DECLARE n_fw_id, chunk_size, offset int;
    DECLARE chunk longblob;
    DECLARE done int DEFAULT FALSE;

    DECLARE x CURSOR FOR SELECT id FROM autoprov_firmwares ORDER BY id ASC;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    SET chunk_size = 10485760;
    SET offset = 1;

    OPEN x;
    x_main: LOOP
        FETCH x INTO n_fw_id;
        IF done THEN
            LEAVE x_main;
        END IF;
        SET offset = 1;
        x_chunk: LOOP
            SELECT substr(data, offset, chunk_size) INTO chunk
              FROM autoprov_firmwares
             WHERE id = n_fw_id;
            IF LENGTH(chunk) > 0 THEN
                INSERT INTO autoprov_firmwares_data (fw_id, data)
                    VALUES (n_fw_id, chunk);
                SET offset = offset+chunk_size;
            ELSE
                LEAVE x_chunk;
            END IF;
        END LOOP;
    END LOOP;
    CLOSE x;

END;;
DELIMITER ;

CALL split_autoprov_firmware_data;
DROP PROCEDURE split_autoprov_firmware_data;

ALTER TABLE autoprov_firmwares DROP data;

COMMIT;