java项目实战-jdbc实现-书城的增删改查-day21

目录

• 1. 安装mysql 安装navicate
• 2. jdbc实现增删改查

1. 安装mysql 安装navicate

参考网上资料

创库 创表 并放入3条测试数据

2. jdbc实现增删改查

book 实体类

package com.msb;

/**
 * @Auther: jack.chen
 * @Date: 2023/11/6 - 11 - 06 - 20:33
 * @Description: com.msb
 * @version: 1.0
 */
public class Book {
    private int id;
    private String name;
    private String author;
    private double price;

    public Book() {
    }

    public Book(int id, String name, String author, double price) {
        this.id = id;
        this.name = name;
        this.author = author;
        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 String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                '}';
    }
}

实现增删改查

package com.msb;

import javafx.beans.binding.When;

import java.sql.*;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * @Auther: jack.chen
 * @Date: 2023/11/6 - 11 - 06 - 20:27
 * @Description: com.msb
 * @version: 1.0
 */
public class Test {

    public static void main(String[] args) throws SQLException, ClassNotFoundException {
        while (true){
            System.out.println("--欢迎来到书城--");
            System.out.println("1.数据编号查询书籍");
            System.out.println("2.查询所有书籍");
            System.out.println("3.删除指定编号书籍");
            System.out.println("4.退出");

            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入编号：");

            int choice = scanner.nextInt();
            if (choice==1){
                System.out.println("请输出需要查询的书籍编号:");

                int bno = scanner.nextInt();
                Book b = getBookByNo(bno);
                if (b==null){
                    System.out.println("您查询的书籍不存在");
                }else{
                    System.out.println("查询成功！！！");
                    System.out.println(b);
                }

            }
            if (choice==2){
                ArrayList books = getAllBooks();
                if (books.size()==0){
                    System.out.println("书城里面没有书籍信息！");
                }else{
                    System.out.println("查询成功：");
                    for (int i = 0; i < books.size(); i++) {
                        System.out.println(books.get(i));
                    }
                }
            }
            if (choice==3){

            }
            if (choice==4){
                System.out.println("退出...");
                break;
            }

        }
    }

    public static Book getBookByNo(int bno) throws SQLException, ClassNotFoundException {
        Book book = null;
        //加载驱动：
        Class.forName("com.mysql.cj.jdbc.Driver");
        //获取连接：
        String url = "jdbc:mysql://127.0.0.1:3306/mysql?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
        String username = "root";
        String password = "root";
        Connection conn = DriverManager.getConnection(url, username, password);
        //创建会话：
        Statement sta = conn.createStatement();
        //发送SQL：ResultSet结果集合 - 结果集
        ResultSet rs = sta.executeQuery("select * from t_book where id = " + bno);

        if(rs.next()){
            int id = rs.getInt("id");
            String name = rs.getString("name");
            String author = rs.getString("Author");
            double price = rs.getDouble("price");
            book = new Book(id, name, author, price);
        }

        sta.close();
        conn.close();

        return book;
    }

    public static ArrayList getAllBooks() throws ClassNotFoundException, SQLException {
        //加载驱动：
        Class.forName("com.mysql.cj.jdbc.Driver");
        //获取连接：
        String url = "jdbc:mysql://127.0.0.1:3306/mysql?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
        String username = "root";
        String password = "root";
        Connection conn = DriverManager.getConnection(url, username, password);
        //创建会话：
        Statement sta = conn.createStatement();
        //发送SQL：ResultSet结果集合 - 结果集
        ResultSet rs = sta.executeQuery("select * from t_book");

        ArrayList<Book> books = new ArrayList<>();
        while (rs.next()){
            int id = rs.getInt("id");
            String name = rs.getString("name");
            String author = rs.getString("Author");
            double price = rs.getDouble("price");
            Book book = new Book(id, name, author, price);
            books.add(book);
        }

    return books;

    }
}

运行结果