從數據庫中刪除所有信息（MySQL）

Question

我有一個名爲music的數據庫，裏面有4個表格;

1. band_members
2. 帶
3. CDS
4. 版本。

我想刪除數據庫中與cd005（這是一個cd_id列條目）有關的所有信息。

我想我可以在每一個人的表使用

DELETE FROM table_name WHERE cd_id='cd005' 

，但我想知道是否有通過刪除整個數據庫，在一次有關這個ID的數據來解決這個問題的方法。

Answer 1

是的，有一種方法。請檢查mysql文檔以查找外鍵級聯刪除。

例子：

CREATE TABLE parent (id INT NOT NULL, 
        PRIMARY KEY (id) 
) ENGINE=INNODB; 
CREATE TABLE child (id INT, parent_id INT, 
        INDEX par_ind (parent_id), 
        FOREIGN KEY (parent_id) REFERENCES parent(id) 
         ON DELETE CASCADE 
) ENGINE=INNODB; 

Insert into parent set id=1; 
Insert into parent set id=2; 
Insert into parent set id=3; 
Insert into child set id=1, parent_id=1; 
Insert into child set id=2, parent_id=1; 


select * from parent; 
select * from child; 
delete from parent where id=1; 
select * from parent; 
select * from child; 


ID 
1 
2 
3 
Record Count: 3; Execution Time: 0ms View Execution Plan 
ID PARENT_ID 
1 1 
2 1 
Record Count: 2; Execution Time: 0ms View Execution Plan 
Record Count: 0; Execution Time: 1ms 
ID 
2 
3 
Record Count: 2; Execution Time: 0ms View Execution Plan 
Record Count: 0; Execution Time: 0ms