数据库系统原理与实践——第九次作业
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数据库系统原理与实践/平时作业/第九次作业.tex
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数据库系统原理与实践/平时作业/第九次作业.tex
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\documentclass[全部作业]{subfiles}
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\input{mysubpreamble}
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\begin{document}
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\setcounter{chapter}{8}
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\chapter{第九次作业}
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\section*{数据库案例设计综合练习}
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某金融数据库系统背景:
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某银行为了建设金融管理系统,需要对该系统的数据库进行设计,针对该系统,主要将对象分为客户、银行卡、理财产品、保险、基金。假设该系统存在着以下关系:客户可以办理银行卡,同时客户可以购买不同的银行产品,如理财产品,基金和保险。购买后的银行产品统称为客户的资产。
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数据库系统业务需求描述:
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\begin{itemize}
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\item 客户可以办理多张银行卡,不仅可以办理储蓄卡,如果符合要求还可以办理信用卡,客户办理成功后获得银行卡的卡号。
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\item 银行提供多种理财产品,客户根据理财产品的信息(包括产品编号,产品名称,产品描述)购买理财产品,一个客户可以购买多种理财产品,不同的理财产品有不同的购买金额和理财年限。
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\item 银行提供多种保险,客户根据保险的信息(包括保险编号,保险名称,适用人群,保险项目)购买理财产品,一个客户可以购买多种保险,不同的保险有不同的保险金额和保险年限。
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\item 银行提供多种基金,客户根据基金的信息(包括基金编号,基金名称,基金类型,风险等级和基金管理者)购买理财产品,一个客户可以购买多种基金,不同的基金有不同的基金金额。
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\item 客户购买银行产品(理财产品、保险、基金)成为自己的资产后,需要记录这些资产的状态(可用,冻结),每个资产的购买数量,每个资产的收益和购买时间。
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\end{itemize}
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项目具体要求:
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\begin{itemize}
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\renewcommand{\labelitemi}{-}
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\item 创建finance数据库作为项目数据库,数据库编码为UTF-8。
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\item 在finance模式下完成金融管理系统中所有数据库对象(数据表)的创建,并完成数据的填充(可以由navicat自动生成)。其中,客户数据不少于20条,银行卡数据不少于10条,其他数据不少于5条;
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\item 对表添加外键约束,在银行信息表和资产信息表中,都存在每个银行卡必须有一个持卡者、每份资产必须都有一个资产拥有者这样的对应关系。因此针对这种对应关系,创建外键约束。
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\item 在理财产品表、保险信息表和基金信息表中,都存在金额这个属性,在现实生活中,金额不会存在负数。因此针对表中金额的属性,增加大于0的约束条件。
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\item 可以增加其他自定义约束。(可以用触发器来实现,不强制要求)
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\end{itemize}
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本次作业要求:
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1. 分析系统功能,提交相应的E-R图(可以用画图软件(如visio)进行E-R图设计,或者手绘后拍照上传超星平台); (30分)
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2. 根据设计完成的E-R图,转换对应的关系模式,包括对象的具体属性描述和对象之间的关系描述,需至少满足3NF要求;(30分)
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3. 在MySQL中创建数据库,并加入适量的测试数据(某个关系截图,不用所有的关系都截图即可);(10分)
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4. 根据需求创建合适的视图、存储过程、函数、触发器(提交代码);(20分)
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5. 设计一个简单的用户界面,通过JDBC连接到该金融数据库,并测试完成简单的功能(测试代码和演示视频)。(10分)
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注意:本次作业注重数据库设计(包括E-R图、关系模式转换,以及数据库实践SQL操作的综合练习);第5步仅做一个简单的UI界面即可(语言不限),不用太复杂。
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\section*{解答}
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\begin{enumerate}
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\questionandanswer[]{
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分析系统功能,提交相应的E-R图(可以用画图软件(如visio)进行E-R图设计,或者手绘后拍照上传超星平台); (30分)
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}{
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% \includesvgpdf[0.9]{9.1.1.drawio}
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\includegraphics[width=0.9\linewidth]{svg-inkscape/9.1.1.png}
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}
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\questionandanswer[]{
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根据设计完成的E-R图,转换对应的关系模式,包括对象的具体属性描述和对象之间的关系描述,需至少满足3NF要求;(30分)
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}{
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转换对应的关系模式为:
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{
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customer(\underbar{customer_id})
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card(\underbar{card_id})
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product(\underbar{product_id}, name, description, price, year)
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insurance(\underbar{insurance_id}, name, appliacable_people, coverage, price, year)
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fund(\underbar{fund_id}, name, type, risk_rating, manager, price)
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customer_card(\underbar{customer_id}, \underbar{card_id}, status, number, profit, buying_time)
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customer_product(\underbar{customer_id}, \underbar{product_id}, status, number, profit, buying_time)
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customer_insurance(\underbar{customer_id}, \underbar{insurance_id}, status, number, profit, buying_time)
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customer_fund(\underbar{customer_id}, \underbar{fund_id}, status, number, profit, buying_time)
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}
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检查是否满足第三范式。这里有个问题是,例如product,name是否能确定description, price, year,也就是是否允许同名产品存在。这里为了方便起见,就认为不存在这样的函数依赖,也就是允许同名产品存在。
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那么这样的关系模式就满足第三范式了。
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}
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\questionandanswer[]{
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在MySQL中创建数据库,并加入适量的测试数据(某个关系截图,不用所有的关系都截图即可);(10分)
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}{}
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{\kaishu
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\begin{minted}{SQL}
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create table customer(
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customer_id int auto_increment primary key
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);
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create table card(
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card_id int auto_increment primary key
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);
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create table product(
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product_id int auto_increment primary key comment '产品编号',
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name varchar(255) comment '产品名称',
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description varchar(255) comment '产品描述',
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price decimal(10, 2) comment '购买金额',
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year year comment '理财年限'
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);
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create table insurance(
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insurance_id int auto_increment primary key comment '保险编号',
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name varchar(255) comment '保险名称',
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applicable_people varchar(255) comment '适用人群',
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coverage varchar(255) comment '保险项目',
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price decimal(10, 2) comment '保险金额',
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year year comment '保险年限'
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);
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create table fund(
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fund_id int auto_increment primary key comment '基金编号',
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name varchar(255) comment '基金名称',
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type varchar(128) comment '基金类型',
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risk_rating int(3) comment '风险等级',
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manager varchar(64) comment '基金管理者',
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price decimal(10, 2) comment '基金金额'
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);
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create table customer_card(
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customer_id int,
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card_id int,
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status varchar(64) comment '状态',
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number int comment '购买数量',
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profit decimal(10, 2) comment '收益',
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buying_time datetime comment '购买时间',
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foreign key (customer_id) references customer(customer_id),
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foreign key (card_id) references card(card_id)
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);
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create table customer_product(
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customer_id int,
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product_id int,
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status varchar(64) comment '状态',
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number int comment '购买数量',
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profit decimal(10, 2) comment '收益',
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buying_time datetime comment '购买时间',
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foreign key (customer_id) references customer(customer_id),
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foreign key (product_id) references product(product_id)
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);
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create table customer_insurance(
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customer_id int,
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insurance_id int,
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status varchar(64) comment '状态',
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number int comment '购买数量',
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profit decimal(10, 2) comment '收益',
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buying_time datetime comment '购买时间',
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foreign key (customer_id) references customer(customer_id),
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foreign key (insurance_id) references insurance(insurance_id)
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);
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create table customer_fund(
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customer_id int,
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fund_id int,
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status varchar(64) comment '状态',
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number int comment '购买数量',
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profit decimal(10, 2) comment '收益',
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buying_time datetime comment '购买时间',
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foreign key (customer_id) references customer(customer_id),
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foreign key (fund_id) references fund(fund_id)
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);
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\end{minted}
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\noindent\includegraphics[width=1\linewidth]{imgs/2024-12-10-21-22-33.png}
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}
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\questionandanswer[]{
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根据需求创建合适的视图、存储过程、函数、触发器(提交代码);(20分)
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}{}
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{\kaishu
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外键应该已经创建好了。那还剩下金额了。
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\begin{minted}{SQL}
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alter table product add constraint _price_gt_0 check ( price > 0 );
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alter table insurance add constraint _price_gt_0 check ( price > 0 );
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alter table fund add constraint _price_gt_0 check ( price > 0 );
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\end{minted}
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}
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\questionandanswer[]{
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设计一个简单的用户界面,通过 JDBC 连接到该金融数据库,并测试完成简单的功能(测
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试代码和演示视频)。(10 分)
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}{}
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{\kaishu
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\begin{minted}{python}
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# -*- coding: utf-8 -*-
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################################################################################
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# Form generated from reading UI file 'designerLjvxhA.ui'
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##
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# Created by: Qt User Interface Compiler version 5.15.2
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##
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# WARNING! All changes made in this file will be lost when recompiling UI file!
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################################################################################
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import sys
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from PyQt5.QtCore import *
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from PyQt5.QtGui import *
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from PyQt5.QtWidgets import *
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import pymysql
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class Ui_MainWindow(object):
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def setupUi(self, MainWindow):
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if not MainWindow.objectName():
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MainWindow.setObjectName(u"MainWindow")
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MainWindow.resize(800, 600)
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self.centralwidget = QWidget(MainWindow)
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self.centralwidget.setObjectName(u"centralwidget")
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self.verticalLayout_2 = QVBoxLayout(self.centralwidget)
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self.verticalLayout_2.setObjectName(u"verticalLayout_2")
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self.horizontalLayout = QHBoxLayout()
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self.horizontalLayout.setObjectName(u"horizontalLayout")
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self.label = QLabel(self.centralwidget)
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self.label.setObjectName(u"label")
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self.horizontalLayout.addWidget(self.label)
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self.host_edit = QLineEdit(self.centralwidget)
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self.host_edit.setObjectName(u"host_edit")
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self.horizontalLayout.addWidget(self.host_edit)
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self.label_2 = QLabel(self.centralwidget)
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self.label_2.setObjectName(u"label_2")
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self.horizontalLayout.addWidget(self.label_2)
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self.user_edit = QLineEdit(self.centralwidget)
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self.user_edit.setObjectName(u"user_edit")
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self.horizontalLayout.addWidget(self.user_edit)
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self.label_3 = QLabel(self.centralwidget)
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self.label_3.setObjectName(u"label_3")
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self.horizontalLayout.addWidget(self.label_3)
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self.password_edit = QLineEdit(self.centralwidget)
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self.password_edit.setObjectName(u"password_edit")
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self.horizontalLayout.addWidget(self.password_edit)
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self.label_4 = QLabel(self.centralwidget)
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self.label_4.setObjectName(u"label_4")
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self.horizontalLayout.addWidget(self.label_4)
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self.database_edit = QLineEdit(self.centralwidget)
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self.database_edit.setObjectName(u"database_edit")
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self.horizontalLayout.addWidget(self.database_edit)
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self.connect_button = QPushButton(self.centralwidget)
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self.connect_button.setObjectName(u"connect_button")
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self.horizontalLayout.addWidget(self.connect_button)
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self.verticalLayout_2.addLayout(self.horizontalLayout)
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self.verticalLayout = QVBoxLayout()
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self.verticalLayout.setObjectName(u"verticalLayout")
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self.sql_edit = QPlainTextEdit(self.centralwidget)
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self.sql_edit.setObjectName(u"sql_edit")
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self.verticalLayout.addWidget(self.sql_edit)
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self.horizontalLayout_2 = QHBoxLayout()
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self.horizontalLayout_2.setObjectName(u"horizontalLayout_2")
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self.submit_button = QPushButton(self.centralwidget)
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self.submit_button.setObjectName(u"submit_button")
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sizePolicy = QSizePolicy(QSizePolicy.Maximum, QSizePolicy.Minimum)
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sizePolicy.setHorizontalStretch(0)
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sizePolicy.setVerticalStretch(0)
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sizePolicy.setHeightForWidth(self.submit_button.sizePolicy().hasHeightForWidth())
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self.submit_button.setSizePolicy(sizePolicy)
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self.horizontalLayout_2.addWidget(self.submit_button)
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self.verticalLayout.addLayout(self.horizontalLayout_2)
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self.verticalLayout_2.addLayout(self.verticalLayout)
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self.result_text = QTextBrowser(self.centralwidget)
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self.result_text.setObjectName(u"result_text")
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self.verticalLayout_2.addWidget(self.result_text)
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MainWindow.setCentralWidget(self.centralwidget)
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self.menubar = QMenuBar(MainWindow)
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self.menubar.setObjectName(u"menubar")
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self.menubar.setGeometry(QRect(0, 0, 800, 23))
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MainWindow.setMenuBar(self.menubar)
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self.statusbar = QStatusBar(MainWindow)
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self.statusbar.setObjectName(u"statusbar")
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MainWindow.setStatusBar(self.statusbar)
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self.retranslateUi(MainWindow)
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QMetaObject.connectSlotsByName(MainWindow)
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self.setup_other()
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# setupUi
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def retranslateUi(self, MainWindow):
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MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
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self.label.setText(QCoreApplication.translate("MainWindow", u"\u4e3b\u673a", None))
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self.label_2.setText(QCoreApplication.translate("MainWindow", u"\u7528\u6237\u540d", None))
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self.label_3.setText(QCoreApplication.translate("MainWindow", u"\u5bc6\u7801", None))
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self.label_4.setText(QCoreApplication.translate("MainWindow", u"\u6570\u636e\u5e93\u540d", None))
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self.connect_button.setText(QCoreApplication.translate("MainWindow", u"\u8fde\u63a5", None))
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self.submit_button.setText(QCoreApplication.translate("MainWindow", u"\u63d0\u4ea4", None))
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# retranslateUi
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def setup_other(self):
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self.host_edit.setText("localhost")
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self.user_edit.setText("test_user2")
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self.password_edit.setText("Rie4OhYi")
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self.database_edit.setText("finance")
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self.connect_button.clicked.connect(self.on_connect_clicked)
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self.submit_button.clicked.connect(self.on_submit_clicked)
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def on_connect_clicked(self):
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# 打开数据库连接
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self.conn = pymysql.connect(
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host=self.host_edit.text(), user=self.user_edit.text(), passwd=self.password_edit.text())
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self.conn.select_db(self.database_edit.text())
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self.result_text.setText("连接成功")
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def on_submit_clicked(self):
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cur = self.conn.cursor()
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cur.execute(self.sql_edit.toPlainText())
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all_result = ""
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while 1:
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res=cur.fetchone()
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if res is None:
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#表示已经取完结果集
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break
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all_result += str(res) + "\n"
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self.result_text.setText(all_result)
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if __name__ == '__main__':
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app = QApplication(sys.argv)
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window = QMainWindow()
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main_window = Ui_MainWindow()
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main_window.setupUi(window)
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window.show()
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app.exec_()
|
||||
|
||||
\end{minted}
|
||||
|
||||
\noindent\includegraphics[width=1\linewidth]{imgs/2024-12-13-21-18-22.png}
|
||||
}
|
||||
\end{enumerate}
|
||||
|
||||
\end{document}
|
Loading…
Reference in New Issue
Block a user