Preface
I've got a db design job about meeting room booking system last week.There're many suitable tools which can be used to handle this kind of job such as power designer,ERwin,HeidiSQL,dbschema,etc.Today,I'm gonna demonstrate the last one —— dbschema.This is the official website:https://www.dbschema.com
Introduce
dbschema is a rather simply used tool even you're a novice in designing db system.The dbschema which is downloaded on official website only free for 15 days,then you have to pay for license for later useage but there's no limit in function at all.It provide two modes in designing layout of your system.One is offline mode and the other one is connecting to db servers.You can easily synchronize tables of database with your designed tables as soon as possible by refreshing them from time to time.It also supports almost all popular rdbms such as oracle,db2,MySQL,postgreSQL.There're many key features which you can found in the homepage of official website.I'm not going to describe each one of them.
Procedure
The meeting room booking system(I'll call it "mrbs" .) I contains four tables:employee,department,conference_room,room_reservation.The detail of tables shows below.
employee table
1 id 自增id int(11) 2 user_id 工号 int(11) 3 user_name 用户名称 varchar(20) 4 user_phone 用户手机号 bigint 5 user_email 用户邮箱 varchar(50) 6 user_dept_id 用户所在部门id int(11) 7 user_status 在职、离职等 tinyint(4) 8 create_time 用户创建时间 datetime 9 update_time 用户信息修改时间 datetime
department table
1 id 自增id int(11) 2 dept_id 部门id int(11) 3 dept_name 部门名称 varchar(30) 4 parent_id 父级id tinyint(4) 5 tlevel 层级id tinyint(4) 6 create_time 部门创建时间 datetime 7 update_time 部门信息修改时间 datetime
conference_room table
1 id 自增id int(11) 2 room_id 会议室id int(11) 3 room_building_id 楼号 int(11) 4 room_num 房间号 int(11) 5 room_max_num 最大容纳人数 int(11) 6 room_status 会议室状态 tinyint(4) 7 create_time 会议室创建时间 datetime 8 update_time 会议室信息修改时间 datetime
room_reservation table
1 会议室预定表(room_reservation) 2 id 自增id int(11) 3 book_id 预定工单id int(11) 4 book_room_id 预定会议室id int(11) 5 book_start_time 预定开始时间 datetime 6 book_stop_time 预定结束时间 datetime 7 book_user_id 预定人id int(11) 8 book_usage 预定用途 varchar(200) 9 book_status 预定工单状态 tinyint(4) 10 create_time 预定工单创建时间 datetime 11 update_time 预定工单修改时间 datetime
Configure the database connection.
Use mouse to create target tables in dbschema.
Check the primary key & unique key(even other keys but I'm not creating them ye).
Check the foreign key.
After you click ok button,the table will be created in "mrbs" database.
Check the tables in "mrbys".
1 root@localhost:mysql3306.sock [mrbs]>show tables; 2 +------------------+ 3 | Tables_in_mrbs | 4 +------------------+ 5 | conference_room | 6 | department | 7 | employee | 8 | room_reservation | 9 +------------------+ 10 4 rows in set (0.01 sec) 11 12 root@localhost:mysql3306.sock [mrbs]>show create table employeeG 13 *************************** 1. row *************************** 14 Table: employee 15 Create Table: CREATE TABLE `employee` ( 16 `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 17 `user_id` int(10) unsigned NOT NULL COMMENT '工号', 18 `user_name` varchar(20) NOT NULL COMMENT '用户名称', 19 `user_phone` bigint(20) unsigned NOT NULL COMMENT '用户手机号', 20 `user_email` varchar(50) DEFAULT NULL COMMENT '用户邮箱', 21 `user_dept_id` int(10) unsigned NOT NULL COMMENT '用户所在部门id', 22 `user_status` tinyint(3) unsigned NOT NULL COMMENT '是否在职', 23 `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '用户创建时间', 24 `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '用户信息修改时间', 25 PRIMARY KEY (`id`), 26 UNIQUE KEY `uk_user_id` (`user_id`) 27 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户表' 28 1 row in set (0.00 sec) 29 30 root@localhost:mysql3306.sock [mrbs]>show create table departmentG 31 *************************** 1. row *************************** 32 Table: department 33 Create Table: CREATE TABLE `department` ( 34 `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 35 `dept_id` int(10) unsigned NOT NULL COMMENT '部门id', 36 `dept_name` varchar(30) NOT NULL COMMENT '部门名称', 37 `parent_id` tinyint(3) unsigned NOT NULL, 38 `tlevel` tinyint(3) unsigned NOT NULL COMMENT '层级', 39 `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '部门创建时间', 40 `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '部门信息修改时间', 41 PRIMARY KEY (`id`), 42 UNIQUE KEY `uk_dept_id` (`dept_id`) 43 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='部门表' 44 1 row in set (0.00 sec) 45 46 root@localhost:mysql3306.sock [mrbs]>show create table conference_roomG 47 *************************** 1. row *************************** 48 Table: conference_room 49 Create Table: CREATE TABLE `conference_room` ( 50 `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增id', 51 `room_id` int(10) unsigned NOT NULL COMMENT '会议室id', 52 `room_building_id` int(10) unsigned NOT NULL COMMENT '楼号', 53 `room_num` int(10) unsigned NOT NULL COMMENT '房间号', 54 `room_max_num` int(10) unsigned NOT NULL COMMENT '最大容纳人数', 55 `room_status` tinyint(3) unsigned NOT NULL COMMENT '会议室状态', 56 `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '会议室创建时间', 57 `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '会议室信息修改时间', 58 PRIMARY KEY (`id`), 59 UNIQUE KEY `uk_room_id` (`room_id`) 60 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='会议室表' 61 1 row in set (0.00 sec) 62 63 root@localhost:mysql3306.sock [mrbs]>show create table room_reservationG 64 *************************** 1. row *************************** 65 Table: room_reservation 66 Create Table: CREATE TABLE `room_reservation` ( 67 `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增id', 68 `book_id` int(10) unsigned NOT NULL COMMENT '预定工单id', 69 `book_room_id` int(10) unsigned NOT NULL COMMENT '预定会议室id', 70 `book_start_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '预定开始时间', 71 `book_stop_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '预定结束时间', 72 `book_user_id` int(10) unsigned NOT NULL COMMENT '预定人id', 73 `book_usage` varchar(200) NOT NULL COMMENT '预定用途', 74 `book_status` tinyint(3) unsigned NOT NULL COMMENT '预定工单状态', 75 `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '预定工单创建时间', 76 `update_time` date DEFAULT NULL COMMENT '预定工单修改时间', 77 PRIMARY KEY (`id`), 78 UNIQUE KEY `uk_book_id` (`book_id`) 79 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='会议室预定表' 80 1 row in set (0.00 sec)