Question

我的数据库触发器有问题（我使用的是phpmyadmin）。当我在表'customer'中插入新行时。

+-------------+------+------------+--------------+  
| id_customer | name |  group     |  subscribed  |  
+-------------+------+------------+--------------+  
|    1        | John | Business   |    true      |  
|    2        | Rose | Particular |    true      |    
|    3        | Ann  | Business   |    false     |    
+-------------+------+------------+--------------+

我想在我的表'groups_customer'

中添加一个新行

+----------+-------------+  
| id_group | id_customer |  
+----------+-------------+  
|   3      |     1       |  
|   4      |     2       |  
+----------+-------------+

因此，如果我插入订阅的新客户并使用“业务”组，则会在'groups_customer'中添加一行，其中id_group = 3 如果它是新订阅的“特殊”客户，则会添加id_group = 4
在任何其他情况下，它不会在'groups_customer'

上添加任何行

所以这是我的触发器：

CREATE TRIGGER register_client_group  
AFTER INSERT  
ON customer  
FOR EACH ROW  
BEGIN  
IF (NEW.`group`='Business' AND NEW.subscribed=true)  
THEN  
INSERT INTO groups_customer (id_group, id_customer) VALUES (3, NEW.id_customer);  
ELSE IF (NEW.`group`='Particular' AND NEW.subscribed=true)  
THEN  
INSERT INTO groups_customer (id_group, id_customer) VALUES (4, NEW.id_customer);  
END IF;  
END;

MySQL说：

"#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 8 "

问题似乎与IF声明有关。

Answer 1

GROUP是MySQL中的保留字（used by the GROUP BY-Function）。

所以你的触发功能应该是：

CREATE TRIGGER register_client_group
AFTER INSERT
ON customer
FOR EACH ROW
BEGIN
    IF (NEW.`group`='Business' AND NEW.subscribed=true)  
    THEN
        INSERT INTO groups_customer (id_group, id_customer) VALUES (3, NEW.id_customer);  
    ELSEIF (NEW.`group`='Particular' AND NEW.subscribed=true)  
    THEN
        INSERT INTO groups_customer (id_group, id_customer) VALUES (4, NEW.id_customer);
    END IF;
END;

如果您使用的是PHPmyadmin，请记住更改此图像中的默认分隔符。 http://4.bp.blogspot.com/-u8TUx_srGrw/TVZp7saqF3I/AAAAAAAAIn8/fvYOaGcxNfY/s640/DELIMITER+MYSQL.jpg

在MySQL中触发IF条件

1 个答案: