DROP TABLE `next_sequence_item`;CREATE TABLE `next_sequence_item` ( `sequence` BIGINT) ENGINE = innoDB;INSERT INTO `next_sequence_item` VALUES(0);DROP FUNCTION `nextval_item`;DELIMITER $$CREATE FUNCTION `nextval_item` (in_size INT) RETURNS BIGINT MODIFIES SQL DATA DETERMINISTIC BEGIN DECLARE ret_val BIGINT; UPDATE `next_sequence_item` SET `sequence` = `sequence` + in_size; SELECT `sequence..