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Mysql创建自定义序列


/*创建序列方法*/
set global log_bin_trust_function_creators=TRUE;
DROP FUNCTION IF EXISTS _nextval;
create function _nextval(
in_nextname varchar(255)
)
RETURNS VARCHAR(255)
begin
declare _cur int;
declare _max_value int;
declare _min_value int;set _cur=(select current_value from t_sequence where name= in_nextname);
set _max_value=(select max_value from t_sequence where name= in_nextname);
set _min_value=(select min_value from t_sequence where name= in_nextname); if _cur > _max_value then
set _cur=_min_value;
end if;update t_sequence
set current_value = _cur + _increment
where name=in_nextname;
return _cur; end
/*mysql*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `t_sequence`
-- ----------------------------
DROP TABLE IF EXISTS `t_sequence`;
CREATE TABLE `t_sequence` (
`name` varchar(50) COLLATE utf8_bin NOT NULL DEFAULT '',
`current_value` bigint(11) DEFAULT NULL,
`_increment` int(11) DEFAULT NULL,
`max_value` bigint(11) DEFAULT NULL,
`min_value` bigint(11) DEFAULT NULL,
PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;-- ----------------------------
-- Records of t_sequence
-- ----------------------------
INSERT INTO `t_sequence` VALUES ('SEQ_COMMODITY_CODE', '1000', '1', '9999', '1000');
INSERT INTO `t_sequence` VALUES ('SEQ_DEPARTMENT', '20', '1', '999', '20');
INSERT INTO `t_sequence` VALUES ('SEQ_USER_ORDER_CODE', '1000000', '1', '9999999', '1000000');
INSERT INTO `t_sequence` VALUES ('SYSUSER_INCREMENT', '1001', '1', '9999', '1001');
-- ----------------------------
-- Records of t_sequence
-- ----------------------------

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