2019-08-03 mysql函数

1.建表

CREATE TABLE `auto_id` (
  `id` int(11) NOT NULL,
  `num` int(11) NOT NULL DEFAULT '10000000' COMMENT '编码',
  `type` tinyint(1) DEFAULT '0' COMMENT '编码类型：1资产',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

2.创建自增长函数

CREATE DEFINER=`数据库用户名`@`%` FUNCTION `AUTOID`(cType TINYINT UNSIGNED) RETURNS int(11)
BEGIN
    SET @tempnum = 10000000;
    SET @tempId = 1;
    SELECT (`num` + 1) , id INTO @tempnum,@tempId FROM auto_id  WHERE `type` = cType LIMIT 1;
    UPDATE auto_id SET `num` = @tempnum WHERE id = @tempId;
    RETURN @tempnum;
END

3.调用函数

select AUTOID(1)  //1代表编码类型