CREATE TABLE goods (
	id INT PRIMARY KEY AUTO_INCREMENT,
	name VARCHAR(20) NOT NULL,
	price FLOAT NOT NULL,
	desp VARCHAR(30) NOT NULL
);

INSERT INTO goods (name,price,desp) 
VALUES ("手机",2000,"黑色，存储容量32G"),
("冰箱",1500,"银色，对开门"),
("洗衣机",3000,"滚筒"),
("空调",4000,"变频空调");

package com.imooc.jdbc.hrapp.command;

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

//这里的Command接口就是老师上节课视频那个接口，就没贴出来了，直接贴实现类的代码
public class PriceQueryCommand implements Command {
    @Override
    public void excute() {
        System.out.println("请输入一个价格以获取低于此售价的商品信息：");
        Scanner in = new Scanner(System.in);
        float qprice = in.nextFloat();
        Connection connection = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
            //1、加载并注册JDBC驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2、创建数据库连接
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/imooc?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true", "root", "cmz95217s");
            //3、创建statement对象
            stmt = connection.createStatement();
            rs = stmt.executeQuery("SELECT * FROM goods WHERE price<" + qprice);
            //4、遍历查询结果
            while (rs.next()) {
                Integer id = rs.getInt(1);
                String name = rs.getString("name");
                Float price = rs.getFloat("price");
                String desp = rs.getString("desp");
                System.out.println(id + " " + name + " " + price + " " + desp);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            //5、关闭连接，释放资源
            try {
                if (connection != null && !connection.isClosed()) {
                    connection.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Command cmd = new PriceQueryCommand();
        cmd.excute();
    }
}