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MySQL数据库触发器
MySQL数据库触发器
mysql数据库触发器
详解
触发器
是
mysql
5新增的功能,目前线上凤巢系统、北斗系统以及哥伦布系统使用的
数据库
均是
mysql
5.0.45版本,很多程序比如fc-star管理端,sfrd(das),dorado都会用到
触发器
程序,实现对于
数据库
增、删、改引起事件的关联操作。本文介绍了...
【
MYSQL
百炼成圣】炼体大成篇——
数据库触发器
这里是
MYSQL
成圣之路如果对你有帮助,给博主一个免费的点赞以示鼓励欢迎各位点赞评论收藏⭐️@[TOC]先了解一下
触发器
,再来讨论是否能完全代替外键什么是
触发器
?概念:
触发器
(trigger)是SQL server 提供给程序员和数据分析员来保证数据...
mysql
数据库
学习(
触发器
)
引用:http://bbs.
mysql
.cn/thread-9135-1-2.html引用:21.触发程序create table a(sa int);create table b(sb int);...100 本文转自博客园刘凯毅的博客,原文链接:
mysql
数据库
学习(
触发器
),如需转载请自行联系原博主。
MySQL数据库
(32):
触发器
trigger-1
称为DDL
触发器
可以依照特定的情况,替换异动的指令 instead of(
mysql
不支持)2、
触发器
的优缺点2.1、优点
触发器
可通过
数据库
中的相关表实现级联更改(如果一张表的数据改变,可以利用
触发器
实现对其他表的操作,用户不知道)保证数据安全...
数据库
知识复习:
Mysql触发器
距离小红老师的《
数据库
原理》课程已经有一年了,增删改查大家肯定还记得,但是
触发器
估计忘得差不多了吧(至少我是还给小红老师了),下面通过一个例子来复习一下
触发器
trigger的知识。一、
触发器
的定义
触发器
是与表有关的
数据库
对象,在...
【
MySQL
】
数据库
进阶之
触发器
内容详解
MySQL
中定义了NEW和OLD,用来表示
触发器
所在表中,触发了
触发器
哪一行数据,来引用
触发器
中发生变化的记录内容,具体见下表:
触发器
类型
触发器
类型NEW与OLD的使用INSERT型
触发器
NEW表示将要或者已经新增的数据UPDATE型
触发器
OLD表示修改...
MySQL数据库
(32):
触发器
trigger-2
四、触发
触发器
让
触发器
执行,让
触发器
指定的表中,对应的时机发生对应的操作insert into
my
_order(item_id,count)values(1,1);
mysql
>select*from
my
_order;id|item_id|count|+-+-+-+|1|1|1|+-+-+-+1 row in set(0.00 sec)
mysql
>select*...
mysql数据库
索引和视图,
触发器
索引简介 跟存储引擎有很大关系其实就是一种排序,生成一种算法,索引主要用在大数据量的时候使用,数据小根本没必要 索引在
mysql
中也叫做键,是存储引擎用于快速找到记录的一种数据结构,索引对于良好的性能非常关键,尤其是当表中的数据...
关于商务网站采用
mysql数据库
,业务用
触发器
写合理吗?
关于商务网站采用
mysql数据库
,业务用
触发器
写,合理吗?
MySQL
第七篇:
数据库
设计、视图与
触发器
触发器
一、
触发器
的概念 1、理解
触发器
mysql
5.0新增的功能,
触发器
定义了一系列的操作,这一系列的操作称为触发程序,当触发事件发生时,触发程序自动运行。2、作用
触发器
主要用于监视某个表的insert、update、delete等更新操作,这些...
1
2
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云数据库RDS MySQL版
MySQL 是全球最受欢迎的开源数据库,阿里云MySQL版 通过深度的内核优化和独享实例提供稳定极致的数据库性能,同时灵活的部署架构及产品形态,可满足不同场景下的数据库需求。
了解详情
管理控制台
在线咨询
最新活动
MySQL2核4G 8.8元/月
数据库专场优惠
快速入门
帮助文档
快速入门
最佳实践
SaaS上云数据库
数据库客户案例合集
产品推荐
云数据库PolarDB
云原生数据仓库MySQL
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云数据库RDS MySQL版
MySQL 是全球最受欢迎的开源数据库,阿里云MySQL版 通过深度的内核优化和独享实例提供稳定极致的数据库性能,同时灵活的部署架构及产品形态,可满足不同场景下的数据库需求。
了解详情
管理控制台
在线咨询
最新活动
MySQL2核4G 8.8元/月
数据库专场优惠
快速入门
帮助文档
快速入门
最佳实践
SaaS上云数据库
数据库客户案例合集
产品推荐
云数据库PolarDB
云原生数据仓库MySQL