订单案例

抽象出来5张表

1. Users 用户表
2. Products：商品表
3. types：商品类型表
4. Orders：订单表
5. Details：订单详情表

分别设计这5张表

1. 创建数据库

   create database mall;
   

2. Types表

   create table types(tid varchar(32) primary key, name varchar(20) not null unique);
   
   
   insert into types values(replace(uuid(), '-', ''), 'house'),(replace(uuid(), '-', ''), 'digit'), (replace(uuid(), '-', ''), 'sports');
   

3. Users表

   create table users(uid int primary key auto_increment, name varchar(20) not null unique, pass varchar(20) not null, phone varchar(11) );
   
   insert into users values(null, 'wukong', '888888', '13333333333');
   insert into users values(null, 'bajie', '888888', '13999999999');
   

4. Products表

   create table products(pid varchar(32) primary key, name varchar(20), img varchar(40), price double, tid varchar(32) references types(tid));
   
   insert into products values(replace(uuid(), '-', ''), 'mac pro', 'mac.jpg', 21999, 'dd6501cb628111eaad320242ac110003');
   

5. Details表

   create table details (did varchar(32), count int, pid varchar(32) references products(pid));
   

6. 整个命令行的结果如下

   mysql> create database mall
       -> ;
   Query OK, 1 row affected (0.00 sec)
   
   mysql> use mall
   Database changed
   mysql> create table typestid varchar(32) primary key, name varchar(20) not null ;
   ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'varchar(32) primary key, name varchar(20) not null' at line 1
   mysql> 
   mysql> insert into types values(replace(uuid(), '-', ''), 'house'),(replace(uuid(), '-', ''), 'digit'), (replace(uuid(), '-', ''), 'sports');
   ERROR 1146 (42S02): Table 'mall.types' doesn't exist
   mysql> create table typestid varchar(32) primary key, name varchar(20) not null ;
   ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'varchar(32) primary key, name varchar(20) not null' at line 1
   mysql> create table types(tid varchar(32) primary key, name varchar(20));
   Query OK, 0 rows affected (0.02 sec)
   
   mysql> insert into types values(replace(uuid(), '-', ''), 'house'), (replace(uuid(), '-', ''), 'digit');
   Query OK, 2 rows affected (0.01 sec)
   Records: 2  Duplicates: 0  Warnings: 0
   
   mysql> drop table types;
   Query OK, 0 rows affected (0.02 sec)
   
   mysql> create table types(tid varchar(32) primary key, name varchar(20) not null unique);
   Query OK, 0 rows affected (0.02 sec)
   
   mysql> insert into types values(replace(uuid(), '-', ''), 'house'), (replace(uuid(), '-', ''), 'digit');
   Query OK, 2 rows affected (0.01 sec)
   Records: 2  Duplicates: 0  Warnings: 0
   
   mysql> select * from types;
   +----------------------------------+-------+
   | tid                              | name  |
   +----------------------------------+-------+
   | dd6501cb628111eaad320242ac110003 | digit |
   | dd64fd48628111eaad320242ac110003 | house |
   +----------------------------------+-------+
   2 rows in set (0.00 sec)
   
   mysql> create table users(uid int primary key auto_increment, name varchar(20) not null unique, pass varchar(20) not null, phone varchar(11) );
   Query OK, 0 rows affected (0.02 sec)
   
   mysql> insert into users values(null, 'wukong', '888888', '13333333333');
   Query OK, 1 row affected (0.01 sec)
   
   mysql> insert into users values(null, 'bajie', '888888', '13999999999');
   Query OK, 1 row affected (0.00 sec)
   
   mysql> create table products(pid varchar(32) primary key, name varchar(20), img varchar(40), price double, tid varchar(32) references types(tid));
   Query OK, 0 rows affected (0.01 sec)
   
   mysql> insert into products values(replace(uuid(), '-', ''), 'mac pro', 'mac.jpg', 21999, 'dd6501cb628111eaad320242ac110003')
       -> ;
   Query OK, 1 row affected (0.01 sec)
   
   mysql> select * from products;
   +----------------------------------+---------+---------+-------+----------------------------------+
   | pid                              | name    | img     | price | tid                              |
   +----------------------------------+---------+---------+-------+----------------------------------+
   | f07de571628211eaad320242ac110003 | mac pro | mac.jpg | 21999 | dd6501cb628111eaad320242ac110003 |
   +----------------------------------+---------+---------+-------+----------------------------------+
   1 row in set (0.00 sec)
   
   mysql> insert into products values(replace(uuid(), '-', ''), 'mac pro', 'mac.jpg', 21999, 'dd6501cb628111eaad320242ac11000333')
       -> ;
   ERROR 1406 (22001): Data too long for column 'tid' at row 1
   mysql> insert into products values(replace(uuid(), '-', ''), 'mac pro', 'mac.jpg', 21999, 'dd6501cb628111eaad32024eeee')
       -> ;
   Query OK, 1 row affected (0.01 sec)
   
   mysql> select * from products;
   +----------------------------------+---------+---------+-------+----------------------------------+
   | pid                              | name    | img     | price | tid                              |
   +----------------------------------+---------+---------+-------+----------------------------------+
   | f07de571628211eaad320242ac110003 | mac pro | mac.jpg | 21999 | dd6501cb628111eaad320242ac110003 |
   | fe12cc63628211eaad320242ac110003 | mac pro | mac.jpg | 21999 | dd6501cb628111eaad32024eeee      |
   +----------------------------------+---------+---------+-------+----------------------------------+
   2 rows in set (0.00 sec)
   
   mysql> delete from products where pid = 'fe12cc63628211eaad320242ac110003';
   Query OK, 1 row affected (0.00 sec)
   
   mysql> select * from products;
   +----------------------------------+---------+---------+-------+----------------------------------+
   | pid                              | name    | img     | price | tid                              |
   +----------------------------------+---------+---------+-------+----------------------------------+
   | f07de571628211eaad320242ac110003 | mac pro | mac.jpg | 21999 | dd6501cb628111eaad320242ac110003 |
   +----------------------------------+---------+---------+-------+----------------------------------+
   1 row in set (0.00 sec)
   
   mysql> create table details (did varchar(32), count int, pid varchar(32) references products(pid));
   Query OK, 0 rows affected (0.02 sec)
   
   mysql> create table orders(oid varchar(32) primary key, price double, addr varchar(50), paytype varchar(20), uid int references Users(uid), did varchar(32) references Details(did));
   Query OK, 0 rows affected (0.02 sec)
   
   mysql> show tables;
   +----------------+
   | Tables_in_mall |
   +----------------+
   | details        |
   | orders         |
   | products       |
   | types          |
   | users          |
   +----------------+
   5 rows in set (0.00 sec)
   
   mysql>