Mysql数据库设计一个复杂的购物目录零件

Question

我想制作一个通知系统。但我搞砸了数据库设计部分。

该系统将有无限的类别及其项目，使每个类别将有奇怪的特性

例如汽车有一个模型，贸易，生产日期，颜色，齿轮式。 。 。多

另一个例子房地产有一个门计数，花园式，复式三缸类型，多少洗澡，另一个人可以有多少厨房

是电子，它拥有百万像素，技嘉，warrantie，分辨率，尺寸，装运。 。 。

所以我怎么可以一起收集这些数据也许一些对象会有类似的属性，例如大多数项目必须有一个manufacter日期，所以我如何使用数据？模式如何？

Sercan Virlan

Answer 1

你要知道，这是一个非常模糊的问题，所以我想我最好的回答:)

注：有很多更好的方法来做到这一点，我可能会问，为什么你这样做，但下面的方法应该完成你正在寻找的东西！

这里有3个表：

CREATE TABLE `object` (
`id` INTEGER NOT NULL AUTO_INCREMENT , 
`category` INTEGER NOT NULL , 
`name` VARCHAR(100) NOT NULL , 
PRIMARY KEY (`id`) 
); 

CREATE TABLE `properties` (
`id` INTEGER NOT NULL AUTO_INCREMENT , 
`objectid` INTEGER NOT NULL , 
`property_key` VARCHAR(100) NOT NULL , 
`property_value` MEDIUMTEXT NOT NULL , 
PRIMARY KEY (`id`) 
); 

CREATE TABLE `category` (
`id` INTEGER NOT NULL AUTO_INCREMENT , 
`name` VARCHAR(100) NOT NULL , 
PRIMARY KEY (`id`) 
); 

现在让我们添加一些假装数据转换成他们：

INSERT INTO category VALUES ("","CAR"); 
INSERT INTO category VALUES ("","REALESTATE"); 
INSERT INTO category VALUES ("","ELECTRONIC"); 
INSERT INTO object VALUES ("",1,"98 CAMERO"); 
INSERT INTO object VALUES ("",1,"06 PRIUS"); 
INSERT INTO object VALUES ("",2,"A House Someplace"); 
INSERT INTO object VALUES ("",3,"iPod Touch"); 
INSERT INTO object VALUES ("",3,"iPhone"); 
INSERT INTO object VALUES ("",3,"Zune"); 
INSERT INTO properties VALUES ("",1,"color","red"); 
INSERT INTO properties VALUES ("",1,"doors","4"); 
INSERT INTO properties VALUES ("",1,"engine","v6"); 
INSERT INTO properties VALUES ("",2,"engine","electric"); 
INSERT INTO properties VALUES ("",2,"doors","4"); 
INSERT INTO properties VALUES ("",2,"color","blue"); 
INSERT INTO properties VALUES ("",6,"video-playback","true"); 
INSERT INTO properties VALUES ("",4,"video-playback","true"); 
INSERT INTO properties VALUES ("",5,"video-playback","true"); 
INSERT INTO properties VALUES ("",6,"manufacturer","microsoft"); 
INSERT INTO properties VALUES ("",5,"manufacturer","apple"); 
INSERT INTO properties VALUES ("",4,"manufacturer","apple"); 

现在，这里是我们的数据应该是什么样子。

mysql> select * from object; 
+----+----------+-------------------+ 
| id | category | name    | 
+----+----------+-------------------+ 
| 1 |  1 | 98 CAMERO   | 
| 2 |  1 | 06 PRIUS   | 
| 3 |  2 | A House Someplace | 
| 4 |  3 | iPod Touch  | 
| 5 |  3 | iPhone   | 
| 6 |  3 | Zune    | 
+----+----------+-------------------+ 
6 rows in set (0.00 sec) 

mysql> select * from category; 
+----+-------------+ 
| id | name  | 
+----+-------------+ 
| 1 | CAR   | 
| 2 | REALESTATE | 
| 3 | ELECTRONICS | 
+----+-------------+ 
3 rows in set (0.00 sec) 

mysql> select * from properties; 
+----+----------+----------------+----------------+ 
| id | objectid | property_key | property_value | 
+----+----------+----------------+----------------+ 
| 1 |  1 | color   | red   | 
| 2 |  1 | doors   | 4    | 
| 3 |  1 | engine   | v6    | 
| 4 |  2 | engine   | electric  | 
| 5 |  2 | doors   | 4    | 
| 6 |  2 | color   | blue   | 
| 7 |  6 | video-playback | true   | 
| 8 |  4 | video-playback | true   | 
| 9 |  5 | video-playback | true   | 
| 10 |  6 | manufacturer | microsoft  | 
| 11 |  5 | manufacturer | apple   | 
| 12 |  4 | manufacturer | apple   | 
+----+----------+----------------+----------------+ 
12 rows in set (0.00 sec) 

您可以将无限数量的类别，无限数量的属性和无限数量的对象添加到这些表中。

现在加入他们一起：

mysql> SELECT * FROM object 
    -> LEFT JOIN category ON object.category = category.id 
    -> LEFT JOIN properties ON properties.objectid = object.id; 
+----+----------+-------------------+------+-------------+------+----------+----------------+----------------+ 
| id | category | name    | id | name  | id | objectid | property_key | property_value | 
+----+----------+-------------------+------+-------------+------+----------+----------------+----------------+ 
| 1 |  1 | 98 CAMERO   | 1 | CAR   | 1 |  1 | color   | red   | 
| 1 |  1 | 98 CAMERO   | 1 | CAR   | 2 |  1 | doors   | 4    | 
| 1 |  1 | 98 CAMERO   | 1 | CAR   | 3 |  1 | engine   | v6    | 
| 2 |  1 | 06 PRIUS   | 1 | CAR   | 4 |  2 | engine   | electric  | 
| 2 |  1 | 06 PRIUS   | 1 | CAR   | 5 |  2 | doors   | 4    | 
| 2 |  1 | 06 PRIUS   | 1 | CAR   | 6 |  2 | color   | blue   | 
| 3 |  2 | A House Someplace | 2 | REALESTATE | NULL |  NULL | NULL   | NULL   | 
| 4 |  3 | iPod Touch  | 3 | ELECTRONICS | 8 |  4 | video-playback | true   | 
| 4 |  3 | iPod Touch  | 3 | ELECTRONICS | 12 |  4 | manufacturer | apple   | 
| 5 |  3 | iPhone   | 3 | ELECTRONICS | 9 |  5 | video-playback | true   | 
| 5 |  3 | iPhone   | 3 | ELECTRONICS | 11 |  5 | manufacturer | apple   | 
| 6 |  3 | Zune    | 3 | ELECTRONICS | 7 |  6 | video-playback | true   | 
| 6 |  3 | Zune    | 3 | ELECTRONICS | 10 |  6 | manufacturer | microsoft  | 
+----+----------+-------------------+------+-------------+------+----------+----------------+----------------+ 
13 rows in set (0.00 sec) 

我希望这是你在找什么，它的无限可扩展的解决方案，但如果数据库变得令人难以置信的被繁重的工作征税，它可以减缓，只是由于其设计。