第九周作业

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

package homework;

public class Book {
    private String id;
    private String name;
    private double price;
    public String getId() {
        return id;
    }

    public void setId(String 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;
    }

    public Book(String string, String name, double price) {
        super();
        this.id = string;
        this.name = name;
        this.price = price;
    }

    public Book() {
        super();
    }

}

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 homework;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class BookTest {
    static List<Book> listbooks = new ArrayList<Book>();

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        creatBookList();
        menu();

    }

    public static void creatBookList() {
        // TODO Auto-generated method stub
        Book b1 = new Book("001", "网络安全技术", 79.0);
        listbooks.add(b1);
        Book b2 = new Book("002", "JSP实用教程", 59.8);
        listbooks.add(b2);
        Book b3 = new Book("003", "JavaScript", 49.8);
        listbooks.add(b3);
    }

    public static void menu() {
        for (;;) {
            System.out.println("************************");
            System.out.println("*       1.添加图书          *");
            System.out.println("*       2.修改图书          *");
            System.out.println("*       3.删除图书          *");
            System.out.println("*       4.查询图书          *");
            System.out.println("*       5.退出程序          *");
            System.out.println("************************");
            int a = inputInt("请选择你的操作：");
            switch (a) {
            case 1:
                addBook();
                break;
            case 2:
                updateBook();
                break;
            case 3:
                delBook();
                break;
            case 4:
                findBook();
                break;
            case 5:
                return;
            default:
                System.out.println("输入错误，请重新输入");
                break;
            }
        }
    }

    private static void findBook() {
        // TODO Auto-generated method stub
        System.out.println("id   图书名称  图书价格");
        for (Book book : listbooks) {
            System.out.println(book.getId() + " " + book.getName() + "    "
                    + book.getPrice());
        }

    }

    private static void delBook() {
        // TODO Auto-generated method stub
        String id = inputStr("请输入要删除图书的id");
        for (int i = 0; i < listbooks.size(); i++) {
            Book book = listbooks.get(i);
            if (id.equals(book.getId())) {
                listbooks.remove(i);
            }
        }

    }

    private static void updateBook() {
        // TODO Auto-generated method stub
        String id = inputStr("请输入要修改的图书id");
        for (int i = 0; i < listbooks.size(); i++) {
            Book book = listbooks.get(i);
            if (id.equals(book.getId())) {
                book.setName(inputStr("请输入修改后的图书名称："));
                book.setPrice(inputDouble("请输入修改后的图书价格"));
                listbooks.remove(i);
                listbooks.add(i, book);
            }
        }

    }

    private static void addBook() {
        // TODO Auto-generated method stub
        String id = inputStr("请输入要添加的图书id");
        String name = inputStr("请输入要添加的图书名称");
        double price = inputDouble("请输入要添加的图书价格");
        Book book = new Book(id, name, price);
        listbooks.add(book);

    }

    public static String inputStr(String msg) {
        System.out.print(msg);
        return new Scanner(System.in).nextLine();
    }

    public static int inputInt(String msg) {
        System.out.print(msg);
        return new Scanner(System.in).nextInt();
    }

    public static double inputDouble(String msg) {
        System.out.print(msg);
        return new Scanner(System.in).nextDouble();
    }

}

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。

 

1 <%@page import="com.study.book.Book"%>
 2 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 3 <%
 4     String path = request.getContextPath();
 5     String basePath = request.getScheme() + "://"
 6             + request.getServerName() + ":" + request.getServerPort()
 7             + path + "/";
 8 %>
 9 
10 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
11 <html>
12 <head>
13 <base href="<%=basePath%>">
14 
15 <title>My JSP 'Show.jsp' starting page</title>
16 
17 </head>
18 
19 <body>
20     <%
21         List<Book> books = new ArrayList<Book>();
22         books.add(new Book(1001, "《童话故事》", 23.55));
23         books.add(new Book(1002, "《三国演义》", 87.87));
24         books.add(new Book(1003, "《人世间》", 200.00));
25         for (int i = 0; i < books.size(); i++) {
26             out.println(books.get(i));
27     %><br />
28     <%
29         out.println("\n");
30         }
31     %>
32 </body>
33 </html>

Show

3.在MySQL中创建Book表，里面id,name,price,

用命令实现，
添加5个图书，
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
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。
insert into 表名(列，列，列)values(值，值，值)
delete from 表名 where 删除条件
update 表名 set列名=更新值 where 更新条件
select 列，列，列 …… from 表 where 查询条件

create table book(
id int(10) auto_increment primary key,
name varchar(50),
price double(6,2));

用命令实现，
添加一个图书，

insert into Book(id,name,price)values(4,"java",88);

根据名称删除图书，

delete from book where name='java';

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;