-- Sequence 管理表 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; -- 取當前值的函數(shù) DROP FUNCTION IF EXISTS currval; DELIMITER $ CREATE FUNCTION currval (seq_name VARCHAR(50)) RETURNS INTEGER LANGUAGE SQL DETERMINISTIC CONTAINS SQL SQL SECURITY DEFINER COMMENT '' BEGIN DECLARE value INTEGER; SET value = 0; SELECT current_value INTO value FROM sequence WHERE name = seq_name; RETURN value; END $ DELIMITER ; -- 取下一個值的函數(shù) DROP FUNCTION IF EXISTS nextval; DELIMITER $ CREATE FUNCTION nextval (seq_name VARCHAR(50)) RETURNS INTEGER LANGUAGE SQL DETERMINISTIC CONTAINS SQL SQL SECURITY DEFINER COMMENT '' BEGIN UPDATE sequence SET current_value = current_value + increment WHERE name = seq_name; RETURN currval(seq_name); END $ DELIMITER ; -- 更新當前值的函數(shù) DROP FUNCTION IF EXISTS setval; DELIMITER $ CREATE FUNCTION setval (seq_name VARCHAR(50), value INTEGER) RETURNS INTEGER LANGUAGE SQL DETERMINISTIC CONTAINS SQL SQL SECURITY DEFINER COMMENT '' BEGIN UPDATE sequence SET current_value = value WHERE name = seq_name; RETURN currval(seq_name); END $ DELIMITER ; /* -- 測試 INSERT INTO sequence VALUES ('TestSeq', 0, 1); SELECT SETVAL('TestSeq', 10); SELECT CURRVAL('TestSeq'); SELECT NEXTVAL('TestSeq'); */

轉(zhuǎn)載于:https://www.cnblogs.com/shihao/archive/2012/02/14/2351045.html

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