mysql-在表2上删除特定行时在表1中插入行 [英] mysql - Inserting row in table 1 when specific row deleted on table 2

问题描述

当使用触发器mysql在表2上删除特定行时，我决​​定在表1中插入行:

I decide to insert row in table 1 when specific row deleted on table 2 with trigger mysql get this error :

MySQL said: #1363 - There is no NEW row in on DELETE trigger

我该怎么做?

推荐答案

考虑以下示例，并相应地更改为触发器

Consider the following example and change accordingly to your trigger

mysql> create table test (id int, val varchar(20),date datetime);
Query OK, 0 rows affected (0.09 sec)

mysql> insert into test values (1,'aa',now()),(2,'bb',now()),(3,'cc',now());
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> create table test1 like test;
Query OK, 0 rows affected (0.06 sec)

mysql> delimiter //
mysql> create trigger test_del after delete on test 
    -> for each row
    -> begin
    -> insert into test1 (id,val,date) values (old.id,old.val,old.date);
    -> end ;
    -> //
Query OK, 0 rows affected (0.12 sec)

mysql> delimiter ;
mysql> select * from test ;
+------+------+---------------------+
| id   | val  | date                |
+------+------+---------------------+
|    1 | aa   | 2014-09-15 15:08:13 |
|    2 | bb   | 2014-09-15 15:08:13 |
|    3 | cc   | 2014-09-15 15:08:13 |
+------+------+---------------------+
3 rows in set (0.01 sec)

mysql> select * from test1;
Empty set (0.00 sec)

mysql> delete from test where id = 1 ;
Query OK, 1 row affected (0.03 sec)

mysql> select * from test1 ;
+------+------+---------------------+
| id   | val  | date                |
+------+------+---------------------+
|    1 | aa   | 2014-09-15 15:08:13 |
+------+------+---------------------+
1 row in set (0.00 sec)

这篇关于mysql-在表2上删除特定行时在表1中插入行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！