Question

任何人都可以解释下面代码实际上做了什么，我在我的mysqlDB.sql导出文件

上有这个

DROP TRIGGER IF EXISTS `alertupdateevent`;
DELIMITER $$
CREATE TRIGGER `alertupdateevent` AFTER INSERT ON `RECOG`
 FOR EACH ROW BEGIN
INSERT INTO `mydb`.`ALERTUPDATES` (`FIRSTNAME`, `LASTNAME`, `CAMNAME`, `TIMESTAMP`, `RESERVE1`, `ALERTTYPE`, `IMGURL`) VALUES (NEW.FIRSTNAME, NEW.LASTNAME, NEW.DOB, NEW.TIMESTAMP, NEW.FACEID, 'RECOG' , NEW.FACEURL);
END
$$
DELIMITER ;

目前我正在处理一个非我开发的项目，而且我对mysql并不熟悉。

我面临的问题是我在DB中有两个表，如RECOG和ALERTUPDATES，我需要在这两个表中插入数据（相同的数据），我只能看到一个php它将数据插入表`RECOG＆＃39;。

所以我的问题是，当数据通过php插入ALERTUPDATES表时，上面的代码会自动将数据插入表RECOG。

Answer 1

是的，你是对的。基于对某些Trigger操作（如插入，更新或删除）执行的操作，INSERT用于某些UPDATE TABLE TABLE。请参阅MySQL triggers

Answer 2

试试这个..

CREATE TRIGGER trigger_name
BEFORE INSERT
   ON table_name FOR EACH ROW

BEGIN

   -- variable declarations

   -- trigger code

END;

参数或参数

trigger_name

The name of the trigger to create.

BEFORE INSERT

It indicates that the trigger will fire before the INSERT operation is executed.

table_name

The name of the table that the trigger is created on.

<强>限制

You can not create a BEFORE trigger on a view.
You can update the NEW values.
You can not update the OLD values.

示例：

DELIMITER // CREATE TRIGGER contacts_before_insert BEFORE INSERT ON contacts FOR EACH ROW BEGIN DECLARE vUser varchar(50); -- Find username of person performing INSERT into table SELECT USER() INTO vUser; -- Update create_date field to current system date SET NEW.created_date = SYSDATE(); -- Update created_by field to the username of the person performing the INSERT SET NEW.created_by = vUser; END; // DELIMITER ;

价：http://www.techonthenet.com/mysql/triggers/before_insert.php

Mysql自动插入新表

2 个答案: