From 06ada2ef027d8c70e359fa81db21809d321fdb8a Mon Sep 17 00:00:00 2001
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Date: Mon, 11 Sep 2023 09:28:09 +0800
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+# 笔记
+
+	第一步：创建概念模型（类似ER图）	CDM	（用户角度）
+	
+	第二步：转换成逻辑模型	LDM	（计算机角度）
+	
+	第三步：转换成物理模型	PDM	（数据库角度）
+	
+	第四步：生成DDL	
+
+# 数据库设计步骤
+
+	1.需求分析，了解要开发的系统的需求，明确数据和格式
+	
+	2.概念结构设计：将需求分析得到的抽象成概念模型，将ER图向关系模型转化
+	
+	3.逻辑结构设计：将概念结构转化成DBMS所支持的数据模型
+	
+	4.物理结构设计：将概念模型，转换成选定数据库管理系统需要的物理模型
+	
+	5.数据库实施：根据物理模型生成对应的DDL
+	
+	6.数据库维护
+
+# 作业
+
+CREATE DATABASE libary;
+
+DROP TABLE IF EXISTS Class_User;
+CREATE TABLE Class_User(
+classNo int NOT NULL PRIMARY KEY,
+cname VARCHAR(20) NOT NULL UNIQUE,
+term int NOT NULL default 30,
+ceilingNum int NOT NULL
+);
+
+DROP TABLE IF EXISTS BookInfo;
+CREATE TABLE BookInfo(
+ISBN CHAR(13) NOT NULL PRIMARY KEY,
+bname VARCHAR(60) NOT NULL,
+author VARCHAR(30) NOT NULL,
+press VARCHAR(40) NOT NULL,
+price FLOAT NOT NULL,
+language VARCHAR(20) DEFAULT '中文',
+pages int
+);
+
+DROP TABLE IF EXISTS Books;
+CREATE TABLE Books(
+bookNo CHAR(9) PRIMARY KEY,
+ISBN CHAR(13),
+location VARCHAR(40) ,
+bstatus CHAR(1),
+ctr_no int,
+CHECK(bstatus='0' OR bstatus='1' OR bstatus='2' OR bstatus='3'),
+FOREIGN KEY (ISBN) REFERENCES BookInfo(ISBN)
+);
+
+DROP TABLE IF EXISTS Users;
+CREATE TABLE Users(
+loanNo VARCHAR(16) NOT NULL PRIMARY KEY,
+lname VARCHAR(30) NOT NULL,
+pwd VARCHAR(16) NOT NULL,
+unitName VARCHAR(50) NOT NULL,
+registerDate date NOT NULL,
+classNo int NOT NULL,
+email VARCHAR(40)
+);
+
+DROP TABLE IF EXISTS Loan;
+CREATE TABLE Loan(
+bookNo CHAR(9) NOT NULL PRIMARY KEY,
+loanNo VARCHAR(16)NOT NULL,
+borrowDate DATETIME NOT NULL,
+FOREIGN KEY(loanNo) REFERENCES Users(loanNo),
+FOREIGN KEY(bookNo) REFERENCES Books(bookNo)
+);
+
+DROP TABLE IF EXISTS LoanHist;
+CREATE TABLE LoanHist(
+loanNo VARCHAR(16) NOT NULL,
+bookNo CHAR(9) NOT NULL,
+borrowDate DATETIME NOT NULL,
+returnDate DATETIME NOT NULL,
+primary key(bookNo,loanNo,borrowDate),
+foreign key(bookNo) references Books(bookNo),
+foreign key(loanNo) references Users(loanNo)
+);
+
+DROP TABLE IF EXISTS Reservation;
+CREATE TABLE Reservation(
+ISBN CHAR(13) NOT NULL,
+loanNo VARCHAR(16) NOT NULL,
+reservation_Date DATETIME NOT NULL,
+rsratus CHAR(1) NOT NULL,
+primary key(ISBN,loanNo,reservation_Date),
+foreign key(ISBN) references BookInfo(ISBN),
+foreign key(loanNo) references Users(loanNo)
+);
+
+DROP TABLE IF EXISTS Money;
+CREATE TABLE Money(
+ID int NOT NULL AUTO_INCREMENT PRIMARY KEY,
+loanNo VARCHAR(16) NOT NULL,
+bookNo CHAR(9),
+amount FLOAT ,
+reason ENUM('过期罚款','损坏赔偿','丢失赔偿','办证费','办证押金'),
+billdate DATETIME NOT NULL
+);
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-- 
Gitee