遞歸MySql的觸發不工作

Question

我試圖建立一個MySQL觸發數據插入/在ODBC更新後運行

我的觸發低於：

CREATE TRIGGER `myTrigger` 
AFTER INSERT ON `testTable` FOR EACH ROW UPDATE `testTable` SET `Field One` = CONCAT(`Field One`, ' - Trigger'); 

我的觸發聲明MySQL工作臺OK運行但是當我從Microsoft Access數據庫連接到testTable，然後嘗試插入一行我得到的其中之一：

爲了讓事情更有趣，當我嘗試運行以下命令：

INSERT INTO `testTable` (`Field One`, `Field Two`, `Field Three`, `Field Four`, `Field Five`) VALUES ('x', 'xx', 'xxx', 'xxxx', 'xxxxx') 

我收到以下錯誤：

ERROR 1442: Can't update table 'testtable' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.

從工作臺我Triggers標籤完整的觸發代碼如下：

-- Trigger DDL Statements 
DELIMITER $$ 

USE `FooBar`$$ 

CREATE 
DEFINER=`JMK`@`%` 
TRIGGER `myTrigger` 
AFTER INSERT ON `testtable` 
FOR EACH ROW 
UPDATE `testTable` SET `Field One` = CONCAT(`Field One`, ' - Trigger')$$ 

我在做什麼錯？

感謝

Answer 1

即使添加觸發器的查詢是語法正確的和被處決，這並不意味着觸發功能是有效的。

您的觸發器觸發自己。這是從MySQL documentation：

• Stored functions cannot be used recursively.
• Within a stored function or trigger, it is not permitted to modify a table that is already being used (for reading or writing) by the statement that invoked the function or trigger.