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我有此表沒有PK:的MySQL得到的值更改時更新
列:
id - number of id in table that was changed
action - what action was used (insert,update,delete) on row
name - new variable
who - who changed it
ts - when was it changed
表:
id action name who ts
2 insert text admin 2014-06-29 20:10:57
2 update new_text user 2014-06-29 20:10:57
2 delete new_text admin 2014-06-29 20:10:57
我試圖從該行得到什麼被改爲什麼
例如:
id action name_from name_to who ts
2 insert text admin 2014-06-29 20:10:57
2 update text new_text admin 2014-06-29 20:10:57
2 delete admin 2014-06-29 20:10:57
我想插入和刪除很容易,因爲這是沒有以前的變量,但棘手的是更新。
我的目標:是從去年(插入選擇變量名,更新與新的更新比較
此:
id action name_from name_to who ts
2 update text new_text admin 2014-06-29 20:10:57
問題:要獲得前值我使用時間戳在這種情況下,時間戳相同。
使用主鍵 –