390 lines
15 KiB
TeX
390 lines
15 KiB
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)
|
|||
|
|
|
|||
|
|
self.horizontalLayout_2 = QHBoxLayout()
|
|||
|
|
self.horizontalLayout_2.setObjectName(u"horizontalLayout_2")
|
|||
|
|
self.submit_button = QPushButton(self.centralwidget)
|
|||
|
|
self.submit_button.setObjectName(u"submit_button")
|
|||
|
|
sizePolicy = QSizePolicy(QSizePolicy.Maximum, QSizePolicy.Minimum)
|
|||
|
|
sizePolicy.setHorizontalStretch(0)
|
|||
|
|
sizePolicy.setVerticalStretch(0)
|
|||
|
|
sizePolicy.setHeightForWidth(self.submit_button.sizePolicy().hasHeightForWidth())
|
|||
|
|
self.submit_button.setSizePolicy(sizePolicy)
|
|||
|
|
|
|||
|
|
self.horizontalLayout_2.addWidget(self.submit_button)
|
|||
|
|
|
|||
|
|
|
|||
|
|
self.verticalLayout.addLayout(self.horizontalLayout_2)
|
|||
|
|
|
|||
|
|
|
|||
|
|
self.verticalLayout_2.addLayout(self.verticalLayout)
|
|||
|
|
|
|||
|
|
self.result_text = QTextBrowser(self.centralwidget)
|
|||
|
|
self.result_text.setObjectName(u"result_text")
|
|||
|
|
|
|||
|
|
self.verticalLayout_2.addWidget(self.result_text)
|
|||
|
|
|
|||
|
|
MainWindow.setCentralWidget(self.centralwidget)
|
|||
|
|
self.menubar = QMenuBar(MainWindow)
|
|||
|
|
self.menubar.setObjectName(u"menubar")
|
|||
|
|
self.menubar.setGeometry(QRect(0, 0, 800, 23))
|
|||
|
|
MainWindow.setMenuBar(self.menubar)
|
|||
|
|
self.statusbar = QStatusBar(MainWindow)
|
|||
|
|
self.statusbar.setObjectName(u"statusbar")
|
|||
|
|
MainWindow.setStatusBar(self.statusbar)
|
|||
|
|
|
|||
|
|
self.retranslateUi(MainWindow)
|
|||
|
|
|
|||
|
|
QMetaObject.connectSlotsByName(MainWindow)
|
|||
|
|
|
|||
|
|
self.setup_other()
|
|||
|
|
# setupUi
|
|||
|
|
|
|||
|
|
def retranslateUi(self, MainWindow):
|
|||
|
|
MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
|
|||
|
|
self.label.setText(QCoreApplication.translate("MainWindow", u"\u4e3b\u673a", None))
|
|||
|
|
self.label_2.setText(QCoreApplication.translate("MainWindow", u"\u7528\u6237\u540d", None))
|
|||
|
|
self.label_3.setText(QCoreApplication.translate("MainWindow", u"\u5bc6\u7801", None))
|
|||
|
|
self.label_4.setText(QCoreApplication.translate("MainWindow", u"\u6570\u636e\u5e93\u540d", None))
|
|||
|
|
self.connect_button.setText(QCoreApplication.translate("MainWindow", u"\u8fde\u63a5", None))
|
|||
|
|
self.submit_button.setText(QCoreApplication.translate("MainWindow", u"\u63d0\u4ea4", None))
|
|||
|
|
# retranslateUi
|
|||
|
|
|
|||
|
|
def setup_other(self):
|
|||
|
|
self.host_edit.setText("localhost")
|
|||
|
|
self.user_edit.setText("test_user2")
|
|||
|
|
self.password_edit.setText("Rie4OhYi")
|
|||
|
|
self.database_edit.setText("finance")
|
|||
|
|
self.connect_button.clicked.connect(self.on_connect_clicked)
|
|||
|
|
self.submit_button.clicked.connect(self.on_submit_clicked)
|
|||
|
|
|
|||
|
|
def on_connect_clicked(self):
|
|||
|
|
# 打开数据库连接
|
|||
|
|
self.conn = pymysql.connect(
|
|||
|
|
host=self.host_edit.text(), user=self.user_edit.text(), passwd=self.password_edit.text())
|
|||
|
|
self.conn.select_db(self.database_edit.text())
|
|||
|
|
self.result_text.setText("连接成功")
|
|||
|
|
|
|||
|
|
def on_submit_clicked(self):
|
|||
|
|
cur = self.conn.cursor()
|
|||
|
|
cur.execute(self.sql_edit.toPlainText())
|
|||
|
|
all_result = ""
|
|||
|
|
while 1:
|
|||
|
|
res=cur.fetchone()
|
|||
|
|
if res is None:
|
|||
|
|
#表示已经取完结果集
|
|||
|
|
break
|
|||
|
|
all_result += str(res) + "\n"
|
|||
|
|
self.result_text.setText(all_result)
|
|||
|
|
|
|||
|
|
|
|||
|
|
if __name__ == '__main__':
|
|||
|
|
app = QApplication(sys.argv)
|
|||
|
|
window = QMainWindow()
|
|||
|
|
main_window = Ui_MainWindow()
|
|||
|
|
main_window.setupUi(window)
|
|||
|
|
window.show()
|
|||
|
|
app.exec_()
|
|||
|
|
|
|||
|
|
\end{minted}
|
|||
|
|
|
|||
|
|
\noindent\includegraphics[width=1\linewidth]{imgs/2024-12-13-21-18-22.png}
|
|||
|
|
}
|
|||
|
|
\end{enumerate}
|
|||
|
|
|
|||
|
|
\end{document}
|