MySQL基于实例sales创建自定义函数、视图、存储过程及触发器
实例:数据库sales
1.客户表(Customer)
客户编号(CusNo) | 姓名(CusName) | 地址(Address) | 电话(Tel) |
C001 | 杨婷 | 北京 | 010-5328953 |
C002 | 李和平 | 上海 | 021-62359651 |
C003 | 叶新 | 成都 | 024-3222781 |
C004 | 冯辰诚 | 上海 | 021-87235965 |
2.产品表(Product)
产品编号(ProNo) | 品名(ProName) | 单价(price) | 库存数量(Stocks) |
P0001 | 液晶电视 | 5600.00 | 800 |
P0002 | 空调 | 2390.00 | 460 |
P0003 | 洗衣机 | 3700.00 | 600 |
P0004 | 电热水器 | 890.00 | 120 |
3.销售表(ProOut)
销售日期(SaleDate) | 客户编号(CusNo) | 产品编号(ProNo) | 销售数量(Quantity) |
2007-10-27 | C001 | P0001 | 3 |
2007-11-06 | C004 | P0003 | 40 |
2007-12-27 | C001 | P0003 | 5 |
2008-3-15 | C002 | P0002 | 12 |
2008-05-02 | C003 | P0002 | 21 |
2008-05-02 | C003 | P0001 | 9 |
2008-09-21 | C004 | P0001 | 30 |
2008-11-21 | C004 | P0001 | 73 |
一、创建一自定义函数sumMoney,要求能够利用该函数计算出销售金额,并进行测试,利用该函数计算出每种产品(ProNo)的销售金额。
1 DELIMITER $$
2 CREATE FUNCTION sumMoney( pno VARCHAR(10)) -- 输入产品编号
3 RETURNS DOUBLE(10,2) -- 返回金额数据类型
4 BEGIN -- 函数体(返回销售金额=产品单价*销售数)
5 RETURN
6 (SELECT SUM(quantity) FROM proout po,product pr WHERE po.prono=pr.prono AND pr.prono=pno GROUP BY po.prono) --销售数
7 *(SELECT pr.price FROM product pr WHERE pr.prono=pno ); --单价
8 END$$
9 DELIMITER ;
10
11 测试:SELECT sumMoney('P0001');
aaarticlea/png;base64,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" alt="" />
二、创建视图viewPro,要求显示每种产品的销售量和销售金额。
1 DELIMITER $$
2 CREATE FUNCTION sumMoney( pno VARCHAR(10)) -- 输入产品编号
3 RETURNS DOUBLE(10,2) -- 返回金额数据类型
4 BEGIN -- 函数体(返回销售金额=产品单价*销售数)
5 RETURN
6 (SELECT SUM(quantity) FROM proout po,product pr WHERE po.prono=pr.prono AND pr.prono=pno GROUP BY po.prono) --销售数
7 *(SELECT pr.price FROM product pr WHERE pr.prono=pno ); --单价
8 END$$
9 DELIMITER ;
10
11 测试:SELECT sumMoney('P0001');
aaarticlea/png;base64,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" alt="" />
三、创建存储过程p_Pro, 要求能够根据指定的客户编号,统计该客户购买每种产品的产品号、数量。
1 DELIMITER $$
2 CREATE
3 PROCEDURE p_Pro(cno VARCHAR(10)) -- 创建存储过程PROCEDURE,名称 p_Pro,参数名称及参数类型(cno VARCHAR(10))
4 BEGIN
5 SELECT po.prono AS'产品号',SUM(po.quantity)AS'数量'
6 FROM proout po WHERE po.cusno=cno GROUP BY po.prono; -- 存储的内容
7 END$$
8 DELIMITER ;
9
10 测试:CALL p_Pro('C004'); -- 使用CALL关键字
aaarticlea/png;base64,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" alt="" />
四、创建一个触发器t_Stocks,要求当插入销售表(ProOut)的销售记录时,根据销售数量(Quantity)的变化,能更新产品表(Product)中相应的库存数量 (Stocks)。
这里需要注意的是new和old的用在after和before时有不同,如下:
1 DELIMITER $$
2 CREATE TRIGGER t_Stocks AFTER INSERT
3 ON proout FOR EACH ROW
4 BEGIN
5 DECLARE num INT ; -- 定义变量,关键字DECLARE
6 SET num =
7 (SELECT stocks FROM product WHERE prono = new.prono);
8 IF num < new.quantity
9 THEN SET new.quantity = num ;
10 END IF ; -- IF 条件表达式 THEN 执行语句 END IF;
11 /*假设给的销售数大于库存数,那新的库存数将为负数,这与实际不相符,所以对销售数进行判断,如果大于库存数,重新赋值销售数=库存数*/
12 UPDATE product SET stocks = stocks - new.quantity WHERE prono = new.prono ;
13 END $$
14 DELIMITER ;
运行结果:出现错误 Error Code :1362
Updating of NEW row is not allowed in after trigger
原因是什么呢?是因为:
AFTER是先完成数据的INSERT/UPDATE/DELETE,再触发,触发的语句晚于监视的增删改操作,无法影响前面的INSERT/UPDATE/DELETE动作。
也就是说在AFTER中对new数据进行重新赋值不能影响前面的INSERT/UPDATE/DELETE动作,也就变得没有意义,因此在AFTER中不能对new数据进行 赋值,只能读取。
BEFORE是先完成触发,再进行INSERT/UPDATE/DELETE,触发的语句先于监视的INSERT/UPDATE/DELETE,也就是有机会判断、修改INSERT /UPDATE/DELETE操作,因此对new数据赋值要放在BEFORE中。
修改后语句:
1 DELIMITER $$
2 CREATE TRIGGER t_Stocks BEFORE INSERT
3 ON proout FOR EACH ROW
4 BEGIN
5 DECLARE num INT ;
6 SET num =
7 (SELECT stocks FROM product WHERE prono = new.prono);
8 IF num < new.quantity
9 THEN SET new.quantity = num ;
10 END IF ;
11 UPDATE product SET stocks = stocks - new.quantity WHERE prono = new.prono ;
12 END $$
13 DELIMITER ;
14
15 测试:INSERT INTO proout VALUES('2009-02-35','C002','P0001',900); -- 原来Stocks是800
aaarticlea/png;base64,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" alt="" />
aaarticlea/png;base64,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" alt="" />
五、在查询的基础上创建一张新表Cus,要求显示客户“C003”在2008年购买的产品号、数量。
MySQL提供的方法和SQL Server的 select (查询) into [新表] from [源表]方法不同,使用的是Create table [表名] as (查询)的方法。
复制整个表为 CREATE TABLE [新表] SELECT * FEOM [源表];
DROP TABLE IF EXISTS cus;
CREATE TABLE cus AS
SELECT po.prono,SUM(po.quantity)
FROM proout po
WHERE po.cusno='c003' AND YEAR(po.saledate)= GROUP BY prono;
aaarticlea/png;base64,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" alt="" />
MySQL基于实例sales创建自定义函数、视图、存储过程及触发器的更多相关文章
- MYSQL数据库重点:自定义函数、存储过程、触发器、事件、视图
一.自定义函数 mysql自定义函数就是实现程序员需要sql逻辑处理,参数是IN参数,含有RETURNS字句用来指定函数的返回类型,而且函数体必须包含一个RETURN value语句. 语法: 创建: ...
- mysql创建自定义函数与存储过程
mysql创建自定义函数与存储过程 一 创建自定义函数 在使用mysql的过程中,mysql自带的函数可能不能完成我们的业务需求,这时就需要自定义函数,例如笔者在开发过程中遇到下面这个问题 mysql ...
- MySQL自定义函数与存储过程的创建、使用、删除
前言 日常开发中,可能会用到数据库的自定义函数/存储过程,本文记录MySQL对自定义函数与存储过程的创建.使用.删除的使用 通用语法 事实上,可以认为存储过程就是没有返回值的函数,创建/使用/删除都非 ...
- 基本开题的感觉是了-MySQL继续继续(自定义函数&存储过程)
hi 感觉论文开题基本确定了,凯森 1.MySQL -----自定义函数----- ----基本 两个必要条件:参数和返回值(两者没有必然联系,参数不一定有,返回一定有) 函数体:合法的SQL语句:以 ...
- MySQL自定义函数与存储过程
1.前置条件 MySQL数据库中存在表user_info,其结构和数据如下: mysql> desc user_info; +-----------+----------+------+---- ...
- MySQL自定义函数和存储过程的区别:
自定义函数和存储过程的区别: 1)一般来说,存储过程实现的功能要复杂一点,而函数的实现的功能针对性比较强.存储过程,功能强大,可以执行包括修改表等一系列数据库操作:用户定义函数不能用于执行一组修改全局 ...
- MySQL 创建自定义函数(2)
说明:下面创建一个函数,调用自定义函数返回一个返回一个随机数. (1) 创建自定义函数
- MySQL(10)---自定义函数
MySQL(10)---自定义函数 之前讲过存储过程,存储过程和自定义函数还是非常相似的,其它的可以认为和存储过程是一样的,比如含义,优点都可以按存储过程的优点来理解. 存储过程相关博客: 1.MyS ...
- sqlserver自定义函数与存储过程的区别 实例详解
分享下sql server自定义函数与存储过程的区别,一起来学习下. 一.自定义函数: 1. 可以返回表变量 2. 限制颇多,包括 不能使用output参数: 不能用临时表: 函数内部的操作不能影响到 ...
随机推荐
- nie题目-游戏排行榜设计
一个mmorpg游戏,玩家众多,需要对玩家战斗力进行排行,并且战斗力变化时需要及时刷新.需要设计一个这样的排行榜. 关于海量数据排行榜的做法,云风在他的博客里给过思路,谈谈陌陌争霸在数据库方面踩过的坑 ...
- .NET 托管堆和垃圾回收
托管堆基础 简述:每个程序都要使用这样或那样的资源,包括文件.内存缓冲区.屏幕空间.网络连接.....事实上,在面向对象的环境中,每个类型都代表可供程序使用的一种资源.要使用这些资源,必须为代表 ...
- solr 范围查询
[]表示查询一个包括边界范围, {}表示查询一个不包括边界范围 A TO * 表示没有上界即>=A或是>A ,视使用的是[]还是{}而定 * TO A 表示没有下界即<=A或是< ...
- GCD调度组、自定义队列来实现多个下载任务
#define KURL1 @"http://img0.imgtn.bdimg.com/it/u=79920747,2237302485&fm=90&gp=0.jpg&quo ...
- Android(java)学习笔记267:Android线程池形态
1. 线程池简介 多线程技术主要解决处理器单元内多个线程执行的问题,它可以显著减少处理器单元的闲置时间,增加处理器单元的吞吐能力. 假设一个服务器完成一项任务所需时间为:T1 创建线程时间, ...
- (四)u-boot2013.01.01 for TQ210:《mkconfig分析》
config.mk主要功能是配置单板信息和编译环境,将会被u-boot的makefile所调用,本文仍然侧重于句法分析. ####################################### ...
- java开发常用命令
cd /d e:work2,更改至当前工作目录svnup.bat,批量更新所有项目 @echo off for /D %%i in (.\*) do ( echo %%i svn up %%i )ho ...
- 转:android surface简单使用Demo
转: http://blog.csdn.net/listening_music/article/details/6860786 通过之前介绍的如何自定义View, 我们知道使用它可以做一些简单的动画效 ...
- 上架第一个APP到苹果商店被拒绝5次
- : Metadata Rejected (APP中的注册时跳转的 - 用户协议视图没有内容).Waiting For Review 6天 In Review 1天 第二次被拒绝 -- : Met ...
- Linux 网卡驱动设备程序设计(1)
一.网卡驱动架构分析 1. Linux 网络子系统 #系统调用接口层 为应用程序提供访问网络子系统的统一方法. #协议无关层 提供通用的方法来使用传输层协议. #协议栈的实现 实现具体的网络协议 #设 ...