mysql主键id的生成方式(自增、唯一不规则) mysql主键id的生成方式(自增、唯

1、利用uuid函数生成唯一且不规则的主键id
2、id实现自动增长

1、利用uuid函数生成唯一且不规则的主键id sql：

CREATE TABLE `test` (`id` varchar(100) COLLATE utf8_estonian_ci NOT NULL COMMENT '唯一不重复',`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,`sex` int(11) DEFAULT NULL,`name` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`username` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`password` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`classes` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`major` int(255) DEFAULT NULL,`QQ` int(20) DEFAULT NULL,`introducemyself` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_estonian_ci ROW_FORMAT=DYNAMIC;

表:

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插入语句：

INSERT INTO test(id,sex,name,username,password,classes,major,QQ,introducemyself) VALUE(replace(uuid(), '-', ''),1,"小米","xck","001","八班",265,953190259,"我最牛");

执行了俩次，生成了俩个不同id：

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2、id实现自动增长将类型改为整型，下方选择自动增长

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看DDL：

CREATE TABLE `test` (`id` bigint(100) NOT NULL AUTO_INCREMENT COMMENT '唯一不重复',`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,`sex` int(11) DEFAULT NULL,`name` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`username` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`password` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`classes` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,`major` int(255) DEFAULT NULL,`QQ` int(20) DEFAULT NULL,`introducemyself` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_estonian_ci ROW_FORMAT=DYNAMIC;

插入一条数据，sql：