简单的文件管理系统—数据库设计

应一友请求，现手撸一简单文件管理系统

一、项目主要功能

1、类似云盘，用户可以在网盘中新建多层文件夹，并可以上传文件、下载文件、删除文件、删除文件夹
2、提供文件分类功能

二、数据表设计

这里采用MySQL数据库
为了实现功能，我们需要六个数据表：用户信息、文件夹信息、文件信息、文件类型、文件浏览记录和文件下载记录
数据库图：

MYSQL数据库脚本：

drop table if exists browse_record;

drop table if exists dir_inf;

drop table if exists download_record;

drop table if exists file_cate;

drop table if exists file_inf;

drop table if exists user_inf;

/*==============================================================*/
/* Table: browse_record */
/*==============================================================*/
create table browse_record
(
   browse_id            varchar(64) not null comment '浏览编号',
   file_id              varchar(64) comment '文件编号',
   user_id              varchar(64) comment '用户编号',
   browse_time          varchar(64) comment '浏览时间',
   primary key (browse_id)
);

alter table browse_record comment '文件浏览记录';

/*==============================================================*/
/* Table: dir_inf */
/*==============================================================*/
create table dir_inf
(
   dir_id               varchar(64) not null comment '文件夹编号',
   dir_name             varchar(512) not null comment '文件夹名称',
   parent_dir           varchar(64) default NULL comment '父文件夹',
   dir_user_id          varchar(64) not null comment '创建人',
   dir_path             varchar(1024) not null comment '文件夹地址',
   primary key (dir_id),
   key dir_user_id (dir_user_id)
)
ENGINE=InnoDB DEFAULT CHARSET=utf8;

alter table dir_inf comment '文件夹';

/*==============================================================*/
/* Table: download_record */
/*==============================================================*/
create table download_record
(
   download_id          varchar(64) not null comment '下载编号',
   file_id              varchar(64) comment '文件编号',
   user_id              varchar(64) comment '用户编号',
   download_time        varchar(64) comment '浏览时间',
   primary key (download_id)
);

alter table download_record comment '文件下载记录';

/*==============================================================*/
/* Table: file_cate */
/*==============================================================*/
create table file_cate
(
   cate_id              varchar(64) not null comment '类型编号',
   cate_name            varchar(100) comment '类型名称',
   cate_status          varchar(2) comment '类型状态',
   primary key (cate_id)
);

alter table file_cate comment '文件类型';

/*==============================================================*/
/* Table: file_inf */
/*==============================================================*/
create table file_inf
(
   file_id              varchar(64) not null comment '文件编号',
   cate_id              varchar(64) comment '类型编号',
   dir_id               varchar(64) comment '文件夹编号',
   user_id              varchar(64) comment '用户编号',
   file_name            varchar(512) not null comment '文件名',
   file_size            int(11) not null comment '文件大小(单位kb)',
   file_upload_time     varchar(64) not null comment '上传时间',
   file_status          int(2) not null comment '文件状态',
   primary key (file_id),
   key file_dir_id ()
)
ENGINE=InnoDB DEFAULT CHARSET=utf8;

alter table file_inf comment '文件信息';

/*==============================================================*/
/* Table: user_inf */
/*==============================================================*/
create table user_inf
(
   user_id              varchar(64) not null comment '用户编号',
   username             varchar(50) not null comment '用户名',
   password             varchar(50) not null comment '密码',
   phone                varchar(100) not null comment '电话号码',
   register_time        varchar(64) not null comment '注册时间',
   status               int(2) not null comment '状态',
   primary key (user_id)
)
ENGINE=InnoDB DEFAULT CHARSET=utf8;

alter table user_inf comment '用户信息';

alter table browse_record add constraint FK_Reference_4 foreign key (file_id)
      references file_inf (file_id) on delete restrict on update restrict;

alter table browse_record add constraint FK_Reference_5 foreign key (user_id)
      references user_inf (user_id) on delete restrict on update restrict;

alter table download_record add constraint FK_Reference_6 foreign key (file_id)
      references file_inf (file_id) on delete restrict on update restrict;

alter table download_record add constraint FK_Reference_7 foreign key (user_id)
      references user_inf (user_id) on delete restrict on update restrict;

alter table file_inf add constraint FK_Reference_1 foreign key (cate_id)
      references file_cate (cate_id) on delete restrict on update restrict;

alter table file_inf add constraint FK_Reference_2 foreign key (dir_id)
      references dir_inf (dir_id) on delete restrict on update restrict;

alter table file_inf add constraint FK_Reference_3 foreign key (user_id)
      references user_inf (user_id) on delete restrict on update restrict;