第九周作业
#查看价格高于10块钱的全部图书 select * from book where price>10;
1.做一个图书类Book id,name,price ,get,set访问器，构造方法2个，1个无参，1个有参做一个测试类，在main中创建3个图书对象，放到list集合中。做一个菜单，可以添加，删除，修改，查询
package BookPackage; public class Book { int id; String name; double price; public Book() { super(); } public Book(int id, String name, double price) { super(); this.id = id; this.name = name; this.price = price; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } }
package BookPackage; import java.util.ArrayList; import java.util.Scanner; public class main { static ArrayList<Book> booklist=new ArrayList<Book>(); static Scanner sc=new Scanner(System.in); public static void main(String[] args) { // TODO Auto-generated method stub Book book1=new Book(100,"三国演义",20); Book book2=new Book(200,"红楼梦",30); Book book3=new Book(300,"水浒传",10); booklist.add(book1); booklist.add(book2); booklist.add(book3); for (int i = 0; i <booklist.size(); i++) { Book b= booklist.get(i); System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice()); } System.out.println("==========================="); shouye(); } public static void shouye() { System.out.println("请输入你需要的选项："); System.out.println("1.添加图书"); System.out.println("2.删除图书"); System.out.println("3.修改图书"); System.out.println("4.查询图书"); System.out.println("==========================="); caidan(); } public static void caidan() { int num=sc.nextInt(); switch (num) { case 1: tianjia(); break; case 2: shanchu(); break; case 3: xiugai(); break; case 4: chaxun(); break; default: break; } } private static void chaxun() { // TODO Auto-generated method stub System.out.println("请输入要查询图书名称："); String bookname=sc.next(); for (int i = 0; i < booklist.size(); i++) { if(booklist.get(i).getName().equals(bookname)){ System.out.println("==========================="); Book b= booklist.get(i); System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice()); } } } private static void xiugai() { // 修改图书信息 System.out.println("请输入要修改的图书id："); int bookid=sc.nextInt(); for (int i = 0; i < booklist.size(); i++) { if(booklist.get(i).getId()==bookid){ booklist.remove(i); System.out.println("请输入新的图书编号："); int id=sc.nextInt(); System.out.println("请输入新的图书名称："); String name=sc.next(); System.out.println("请输入新的图书价格："); double price=sc.nextDouble(); Book newbook=new Book(id,name,price); booklist.add(newbook); } } System.out.println("图书信息修改完成！"); System.out.println("==========================="); mulu(); shouye(); } private static void shanchu() { // 删除图书 System.out.println("请输入要删除的图书名称："); String bookname=sc.next(); for (int i = 0; i < booklist.size(); i++) { if(booklist.get(i).getName().equals(bookname)){ booklist.remove(i); } } System.out.println("删除成功！"); System.out.println("==========================="); mulu(); shouye(); } private static void tianjia() { //添加图书 System.out.println("请输入图书编号："); int id=sc.nextInt(); System.out.println("请输入图书名称："); String name=sc.next(); System.out.println("请输入图书价格："); double price=sc.nextDouble(); Book newbook=new Book(id,name,price); booklist.add(newbook); System.out.println("新图书添加完成！"); System.out.println("==========================="); mulu(); shouye(); } private static void mulu() { // 更新后图书目录 for (int i = 0; i <booklist.size(); i++) { Book b= booklist.get(i); System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice()); } System.out.println("==========================="); } }
2.上题的类，在一个JSP页面中，创建一个集合，里面放3个图书，集合循环遍历显示在页面上。
<%@page import="BookPackage.Book"%> <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>index.jsp</title> </head> <body> 图书信息：<br/> <% ArrayList<Book> booklist=new ArrayList<Book>(); Book book1=new Book(100,"哈姆雷特",20); Book book2=new Book(200,"雾都孤儿", 30); Book book3=new Book(300,"王子复仇记", 10); booklist.add(book1); booklist.add(book2); booklist.add(book3); for (int i = 0; i < booklist.size(); i++) { Book b=booklist.get(i); int id=b.getId(); String name=b.getName(); double price=b.getPrice(); out.print("图书编号："+id+"，图书名称："+name+"，图书价格为："+price+"<br>"); } %> </body> </html>
3.在MySQL中创建Book表，里面id,name,price,
用命令实现，
添加一个图书，
根据名称删除图书，
把所有名称是“我”开头的图书删除，
删除全部图书，
把20元以上的图书价格都修改为18.8，
查看全部图书，
查看价格高于10块钱的全部图书
#创建并使用数据库 create database Book; use Book; #创建表 create table book( id int(10) auto_increment primary key, name varchar(50), price double(6,2)); #插入数据 insert into Book(id,name,price)values(1,"水浒传",8.5); insert into Book(id,name,price)values(2,"红楼梦",20); insert into Book(id,name,price)values(3,"三国演义",29.9); insert into Book(id,name,price)values(4,"西游记",10.5); insert into Book(id,name,price)values(5,"我和我的祖国",35);
#根据名称删除图书 delete from book where name='西游记';
#把所有名称是“我”开头的图书删除 delete from book where name like '我%';
#把20元以上的图书价格都修改为18.8 update book set price=18.8 where price>=20;
#查看全部图书 select * from book;
#查看价格高于10块钱的全部图书 select * from book where price>10;
#删除全部图书 delete from book;
