DROP TABLE IF EXISTS MYCAT_SEQUENCE;
CREATE TABLE MYCAT_SEQUENCE (
`name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '名称',
`current_value` int(11) NOT NULL COMMENT '当前值',
`increment` int(11) NOT NULL DEFAULT 1 COMMENT '步长',
PRIMARY KEY (`name`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
INSERT INTO MYCAT_SEQUENCE(name,current_value,increment) VALUES (‘PERSON’,
100000, 100);
DROP FUNCTION IF EXISTS mycat_seq_currval;
DELIMITER ;;
CREATE DEFINER=`root`@`%` FUNCTION `mycat_seq_currval`(seq_name VARCHAR(50))
RETURNS VARCHAR(64) charset utf8
DETERMINISTIC
BEGIN
DECLARE retval VARCHAR(64);
SET retval="-999999999,null";
SELECT CONCAT(CAST(current_value AS CHAR),",",CAST(increment AS
CHAR) ) INTO retval
FROM MYCAT_SEQUENCE WHERE NAME = seq_name;
RETURN retval ;
END
;;
DELIMITER ;
DROP FUNCTION IF EXISTS mycat_seq_setval;
DELIMITER ;;
CREATE DEFINER=`root`@`%` FUNCTION mycat_seq_setval(seq_name VARCHAR(50),value INTEGER)
RETURNS varchar(64) CHARSET utf8
DETERMINISTIC
BEGIN
UPDATE MYCAT_SEQUENCE
SET current_value = value
WHERE name = seq_name;
RETURN mycat_seq_currval(seq_name);
END ;;
DELIMITER ;
DROP FUNCTION IF EXISTS `mycat_seq_nextval`;
DELIMITER ;;
CREATE DEFINER=`root`@`%` FUNCTION `mycat_seq_nextval`(seq_name VARCHAR(50))
RETURNS VARCHAR(64)CHARSET utf8
DETERMINISTIC
BEGIN
UPDATE MYCAT_SEQUENCE SET current_value = current_value + increment
WHERE NAME = seq_name;
RETURN mycat_seq_currval(seq_name);
END;;
DELIMITER ;