1、user
2、blog
3、class(blog分類)
4、user_class（user對應的blog分類）
建表語句如下：
/*
mysql backup
source server version: 8.0.15
source database: myblog
date: 2019/3/5 18:06:25
*/set foreign_key_checks=0;
-- ----------------------------
-- table structure for `blog`
-- ----------------------------
drop table if exists `blog`;
create table `blog` (
`blog_id` int(11) not null auto_increment,
`user_id` int(11) not null,
`class_id` int(11) not null,
`blog_title` varchar(50) character set utf8 collate utf8_general_ci default null,
`blog_content` text character set utf8 collate utf8_general_ci not null,
`blog_label` varchar(10) character set utf8 collate utf8_general_ci default null,
`view_times` int(11) default null,
`create_time` date default null,
primary key (`blog_id`),
key `blog_ibfk_1` (`user_id`),
key `blog_ibfk_2` (`class_id`),
constraint `blog_ibfk_1` foreign key (`user_id`) references `user` (`user_id`) on delete restrict on update restrict,
constraint `blog_ibfk_2` foreign key (`class_id`) references `class` (`class_id`) on delete restrict on update restrict
) engine=innodb auto_increment=15 default charset=utf8;
-- ----------------------------
-- table structure for `class`
-- ----------------------------
drop table if exists `class`;
create table `class` (
`class_id` int(11) not null,
`class_content` varchar(255) not null,
primary key (`class_id`)
) engine=innodb default charset=utf8;
-- ----------------------------
-- table structure for `user`
-- ----------------------------
drop table if exists `user`;
create table `user` (
`user_id` int(11) not null auto_increment,
`user_name` varchar(20) not null,
`password` varchar(20) not null,
primary key (`user_id`)
) engine=innodb auto_increment=7 default charset=latin1;
-- ----------------------------
-- table structure for `user_class`
-- ----------------------------
drop table if exists `user_class`;
create table `user_class` (
`user_id` int(11) not null,
`class_id` int(11) not null,
`number` int(11) default null,
primary key (`user_id`,`class_id`)
) engine=innodb default charset=utf8;
-- ----------------------------
-- records
-- ----------------------------
insert into `blog` values ('8','1','3','妯″潡嫻嬭瘯','寧屾湜鎴愬姛','鍔犳補',null,'2019-03-05'), ('9','1','3','qqq','鎴愮亴鐏岀亴鐏?,'iayou',null,null), ('10','2','4','鐨勬拻','鐖變笂錼︽嫮','钀ㄩ暱鐨?,null,null), ('13','1','4','嫻嬭瘯','緇堜簬鍐欏畬涓€涓簡','~',null,'2019-03-05'), ('14','1','4','嫻嬭瘯','緇堜簬鍐欏畬涓€涓簡','~',null,'2019-03-05');
insert into `class` values ('1','闅忕瑪'), ('2','鎬葷粨'), ('3','瀹炰範'), ('4','鍏朵粬');
insert into `user` values ('1','machao1','1'), ('2','machao2','2'), ('3','machao','2'), ('4','success','1'), ('5','machao44','1'), ('6','bao','1');
insert into `user_class` values ('1','3','2'), ('1','4','2'), ('2','4','1');
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