使用mysql触发器脚本,解决流水数据的添加。

1.建立表脚本

CREATE DATABASE `spring`  DEFAULT CHARACTER SET utf8;



USE `spring`;



CREATE TABLE `account` (

  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,

  `username` varchar(45) NOT NULL,

  `password` varchar(45) NOT NULL,

  `birthday` datetime NOT NULL,

  `email` varchar(45) NOT NULL,

  PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;





CREATE TABLE `account_flow` (

  `id` int(11) DEFAULT NULL,

  `username` varchar(45) DEFAULT NULL,

  `add_time` datetime DEFAULT CURRENT_TIMESTAMP,

  `flag` int(11) DEFAULT '0'

) ENGINE=InnoDB DEFAULT CHARSET=utf8;





 

 2.建立触发器

DELIMITER $$

CREATE TRIGGER `account_insert_trigger` AFTER INSERT ON `account` FOR EACH ROW BEGIN

	INSERT INTO account_flow (id,username,flag) 

		VALUES (new.id, new.username, 1);

    END 

DELIMITER ;


DELIMITER $$ CREATE TRIGGER `account_update_trigger` AFTER UPDATE ON `account` FOR EACH ROW BEGIN if old.username != new.username then INSERT INTO account_flow (id,username,flag) VALUES (new.id, new.username, 2); end if; END DELIMITER ;

 3.触发器说明 (注意new,old关键字
account_insert_trigger: 添加account记录的时候,同时添加一条记录到account_flow表中。

account_update_trigger:修改account记录的时候,判断username是否修改,如果修改同时在account_flow表中添加一条记录。

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