mysql全局唯一id_Mysql实现全局唯一ID

因为MYSQL没有ORACLE中的sequence概念，所以需要建立一个表来模拟sequence，同时也可以作为高位数据保存。

CREATE TABLE IF NOT EXISTS `sys_sequence` (

`id` int(11) unsigned NOT NULL,

`no` varchar(4) NOT NULL DEFAULT '',

`name` varchar(64) NOT NULL DEFAULT ''

) ENGINE=MyISAM AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

ALTER TABLE `sys_sequence` ADD PRIMARY KEY (`id`);

创建MYSQL函数：

create function `get_sequence`(`in_name` varchar(64)) returns varchar(16) charset utf8

begin

declare p_last_id int;

declare p_no varchar(4);

declare p_result varchar(16);

declare p_max_no int;

insert into sys_sequence () values ();

select last_insert_id() into p_last_id;

delete from sys_sequence where id = p_last_id;

if(in_name is not null and in_name <> '') then

select no into p_no from sys_sequence where name = in_name;

if(p_no is null) then

select max(cast(no as unsigned)) into p_max_no from sys_sequence;

set p_no = lpad(p_max_no + 1, 4, 0);

insert into sys_sequence (no, name) values (p_no, in_name);

end if;

else

set p_no = '0000';

end if;

set p_result = concat(p_no, lpad(p_last_id, 12, 0));

return p_result;

end

参考资料

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