在mysql中创建触发器以生成UUID [英] Creating trigger in mysql for generation UUID

问题描述

在插入MySQL之前尝试创建触发器时，如何为每个输入生成新的UUID，这会引发错误.

how can this throw an error when trying to create a trigger before insert in MySQL so that it generates new UUID for every input.

CREATE TRIGGER insert_guid 
BEFORE INSERT ON guid_tool (FOR EACH  ROW 
BEGIN 
  SET NEW.guid_key = UUID()); 
END;

这是我的桌子

create table guid_tool (
    ID INT NOT NULL AUTO_INCREMENT, 
    guid_key CHAR(40) NOT NULL, 
    PRIMARY KEY(ID)
) CHARSET=LATIN1;

我一定做错了.

推荐答案

正如@mabi在评论中提到的那样-括号中有语法错误.以下修改后的代码对我有用:

As mentioned by @mabi in the comments - you have a syntax error with the brackets. The following modified code works for me:

DELIMITER #
CREATE TRIGGER insert_guid 
BEFORE INSERT ON guid_tool
FOR EACH  ROW 
BEGIN 
    SET NEW.guid_key = UUID(); 
END;
#
DELIMITER ;

对其进行测试:

mysql> INSERT INTO guid_tool (ID) VALUES (1);
Query OK, 1 row affected, 1 warning (0.04 sec)

mysql> SELECT * FROM guid_tool;
+----+--------------------------------------+
| ID | guid_key                             |
+----+--------------------------------------+
|  1 | a0467ebf-5c4f-11e3-903a-6cccbb4423e3 |
+----+--------------------------------------+
1 row in set (0.00 sec)

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