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-- 定义序列表
DROP TABLE IF EXISTS sequence;
CREATE TABLE sequence (
	name VARCHAR(50) NOT NULL,
	current_value INT NOT NULL,
	increment INT NOT NULL DEFAULT 1,
	PRIMARY KEY (name)
) ENGINE=InnoDB;

-- 获取当前序列号
DROP FUNCTION IF EXISTS currval;
DELIMITER $
CREATE FUNCTION currval (seq_name VARCHAR(50))
RETURNS INTEGER
CONTAINS SQL
BEGIN
	DECLARE value INTEGER;
	SET value = 0;
	SELECT current_value INTO value
	FROM sequence
	WHERE name = seq_name;
	RETURN value;
END$
DELIMITER ;

-- 获取下一个序列号
DROP FUNCTION IF EXISTS nextval;
DELIMITER $
CREATE FUNCTION nextval (seq_name VARCHAR(50))
RETURNS INTEGER
CONTAINS SQL
BEGIN
	UPDATE sequence SET current_value = current_value + increment
	WHERE name = seq_name;
	RETURN currval(seq_name);
END$
DELIMITER ;

-- 重设序列号
DROP FUNCTION IF EXISTS setval;
DELIMITER $
CREATE FUNCTION setval (seq_name VARCHAR(50), value INTEGER)
RETURNS INTEGER
CONTAINS SQL
BEGIN
	UPDATE sequence SET current_value = value
	WHERE name = seq_name;
	RETURN currval(seq_name);
	END$
DELIMITER ;

-- 初始化数据
INSERT INTO sequence VALUES ('SAMPLE', 1, 1);

-- 测试
SELECT currval('SAMPLE');
SELECT nextval('SAMPLE');
SELECT nextval('SAMPLE');
SELECT setval('SAMPLE',150);
SELECT currval('SAMPLE');
SELECT nextval('SAMPLE');
SELECT nextval('SAMPLE');