mysql触发器关联表更新

mysql> create table voteItem
    -> (
    ->  id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    ->  title varchar(),
    ->  ticketNumber int
    -> );
Query OK,  rows affected (0.09 sec)

mysql>
mysql> create table ticket(
    ->  id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    ->  voteItemID INT references voteItem(id) ,
    ->  ip varchar()
    -> );
Query OK,  rows affected (0.09 sec)

mysql>
mysql> insert into voteItem values (null,'aaaaa',);
Query OK,  row affected (0.03 sec)

mysql>
mysql> select * from voteItem;
+----+-------+--------------+
| id | title | ticketNumber |
+----+-------+--------------+
|   | aaaaa |             |
+----+-------+--------------+
 row in set (0.00 sec)

mysql>
mysql> DELIMITER |
mysql>
mysql> CREATE TRIGGER testref AFTER INSERT ON ticket
    ->   FOR EACH ROW BEGIN
    ->          update voteItem set ticketNumber=ticketNumber+ where id = new.v
oteItemID;
    ->   END;
    -> |
Query OK,  rows affected (0.09 sec)

mysql>
mysql> DELIMITER ;
mysql>
mysql> insert into ticket values (null,,'127.0.0.1');
Query OK,  row affected (0.08 sec)

mysql> select * from ticket;
+----+------------+-----------+
| id | voteItemID | ip        |
+----+------------+-----------+
|   |           | 127.0.0.1 |
+----+------------+-----------+
 row in set (0.00 sec)

mysql> select * from voteItem;
+----+-------+--------------+
| id | title | ticketNumber |
+----+-------+--------------+
|   | aaaaa |             |
+----+-------+--------------+
 row in set (0.00 sec)

摘自csdn论坛(http://bbs.csdn.net/topics/300203458)。