評論表mySQL

Question

我想創建一個'評論'表，所以保存文本，創建，用戶ID等...

但是用戶可以評論很多事情。

所以我不能把'外部'表的外鍵，因爲我也需要能夠評論'圖片'表，這是最佳做法是什麼？

所以基本上是一個多表鏈接表？

Answer 1

評語表：

comment(comment_id,text, created, userid, other_field,...) 

鏈接表

link(comment_id,comment_type, refID,) 

其中comment_type將是你（ 「圖片」， 「後」，...）評論表的名稱。 comment_id將是用戶所做評論的ID。​​是用戶上（POST_ID，Picture_id，...）評論表的id

比方說你有這些表項：

POST(id, some_text,other_stuff,...): 
(1, "Hello Hello", "something",...) 
(2, "Hey there", "something_else",...) 
... 
(57, "TEST TEST", "another something",...) 

PICTURE(pic_id, description, other_stuff): 
(4, "A cat", "something",...) 
(2, "Another cat", "something_else",...) 
... 
(57, "finally a dog", "another something",...) 

當用戶廣告的新評論：

評論

(1,"What a cute cat", 2015-10-02, user24) 
(3,"That something is awesome", 2015-10-02, user87) 

鏈接

(1,"Picture", 4) //That comment is about the cat (Picture ID 4) 
(3, "Post",57) //That comment is about the post with ID 57