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:
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：
2、id实现自动增长
将类型改为整型，下方选择自动增长
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：
INSERT INTO test(sex,name,username,password,classes,major,QQ,introducemyself) VALUE(1,"小米","xck","001","八班",265,953190259,"我最牛");
对应数据库变化：
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