MySQL 在触发器里中断记录的插入或更新？

发布时间：2020-12-12 08:07:44 所属栏目：MsSql教程来源：网络整理

导读：下面是一种实现的方法。思路就是想办法在触发器中利用一个出错的语句来中断代码的执行。 mysql create table t_control(id int primary key); Query OK,0 rows affected (0.11 sec) mysql insert into t_control values (1); Query OK,1 row affected (0.05 s

下面是一种实现的方法。思路就是想办法在触发器中利用一个出错的语句来中断代码的执行。
mysql> create table t_control(id int primary key);
Query OK,0 rows affected (0.11 sec)
mysql> insert into t_control values (1);
Query OK,1 row affected (0.05 sec)
mysql> create table t_bluerosehero(id int primary key,col int);
Query OK,0 rows affected (0.11 sec)
mysql> delimiter //
mysql> create trigger tr_t_bluerosehero_bi before insert on t_bluerosehero
-> for each row
-> begin
-> if new.col>30 then
-> insert into t_control values (1);
-> end if;
-> end;
-> //
Query OK,0 rows affected (0.08 sec)
mysql> delimiter ;
mysql>
mysql> insert into t_bluerosehero values (1,20);
Query OK,1 row affected (0.25 sec)
mysql> insert into t_bluerosehero values (2,40);
ERROR 1062 (23000): Duplicate entry '1' for key 'PRIMARY'
mysql>
mysql> select * from t_bluerosehero;
+----+------+
| id | col |
+----+------+
| 1 | 20 |
+----+------+
1 row in set (0.00 sec)
mysql>
或者
mysql> delimiter //
mysql> create trigger tr_t_bluerosehero_bi before insert on t_bluerosehero
-> for each row
-> begin
-> declare i int;
-> if new.col>30 then
-> insert into xxxx values (1);
-> end if;
-> end;
-> //
Query OK,0 rows affected (0.06 sec)
mysql> delimiter ;
mysql> delete from t_bluerosehero;
Query OK,3 rows affected (0.05 sec)
mysql> insert into t_bluerosehero values (1,1 row affected (0.06 sec)
mysql> insert into t_bluerosehero values (2,40);
ERROR 1146 (42S02): Table 'csdn.xxxx' doesn't exist
mysql>

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!