mysql实现nextVal功能_mysql next_val 不存在

首先创建表：

CREATE TABLE `sys_sequence` (
   `NAME` varchar(50) NOT NULL,
   `CURRENT_VALUE` int(11) NOT NULL DEFAULT '0',
   `INCREMENT` int(11) NOT NULL DEFAULT '1',
   PRIMARY KEY (`NAME`)
 )

INSERT INTO SYS_SEQUENCE(NAME,CURRENT_VALUE,INCREMENT) VALUES('TBL_FS', 1,1)

DELIMITER $$
 
DROP FUNCTION IF EXISTS `currval`$$
 
CREATE DEFINER=`root`@`%` FUNCTION `currval`(seq_name VARCHAR(50)) RETURNS INT(11)
BEGIN
DECLARE VALUE INTEGER;
SET VALUE=0;
SELECT current_value INTO VALUE
FROM sys_sequence 
WHERE NAME=seq_name;
RETURN VALUE;
END$$
 
DELIMITER ;