MySql控制台没有响应

在输入触发器后，控制台似乎处于一种不响应正常命令的奇怪状态。我是不是无意中使用了分隔符

mysql> use nntp;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+---------------------+
| Tables_in_nntp      |
+---------------------+
| articles            |
| newsgroups          |
| newsgroups_articles |
+---------------------+
3 rows in set (0.00 sec)

mysql> show triggers;
Empty set (0.00 sec)

mysql> DELIMITER $$
mysql> USE `nntp`$$
Database changed
mysql> CREATE
    -> TRIGGER `nntp.newsgroups.before_insert`
    -> BEFORE INSERT ON `nntp`.`newsgroups`
    -> FOR EACH ROW
    -> BEGIN
    -> set new.hash = md5(new.newsgroup);
    -> END$$
Query OK, 0 rows affected (0.18 sec)

mysql> DELIMITER $$
mysql> USE `nntp`$$
Database changed
mysql> CREATE
    -> TRIGGER `nntp.newsgroups.before_update`
    -> BEFORE UPDATE ON `nntp`.`newsgroups`
    -> FOR EACH ROW
    -> BEGIN
    -> set new.hash = md5(new.newsgroup);
    -> END$$
Query OK, 0 rows affected (0.19 sec)

mysql> show triggers;
    -> ^CCtrl-C -- exit!
Aborted
thufir@dur:~$ 

---

创建触发器或例程后，需要重新更改分隔符，否则后续所有语句都必须使用相同的分隔符（在本例中为

$$

）

例如：

mysql> DELIMITER $$
mysql> USE `nntp`$$
Database changed
mysql> CREATE
    -> TRIGGER `nntp.newsgroups.before_update`
    -> BEFORE UPDATE ON `nntp`.`newsgroups`
    -> FOR EACH ROW
    -> BEGIN
    -> set new.hash = md5(new.newsgroup);
    -> END$$
Query OK, 0 rows affected (0.19 sec)

mysql> DELIMITER ;
mysql> show triggers;

注意

分隔符

关键字的第二个用法