Java熟食包点系统实战

Posted 2022-05-20 上进小菜猪

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功能描述

创建一个熟食包点的数据库，我的任务是通过名称修改数据库内容的功能；对eatmarket中的eat数据表进行修改；通过查找名称(eatname)对其他信息如价格和库存进行修改(eatprice spare)，将数据表中的内容实现更新；在UI界面创建一个与用户交互的菜单，会有提示告知用户需要进行的具体操作，如输入特定数字进入修改功能，然后输入修改名称，选择要修改的某个内容，输入想要修改的新内容，即可在数据表当中实现内容的更改。

二、功能实现

Java熟食包点系统实战_sql

JDBCUtils.java

package foodmarketMis;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
 
public class JDBCUtils 
 public static final String DRIVER_CLASS_NAME = "com.mysql.jdbc.Driver";
 public static final String URL = "jdbc:mysql://localhost:3306/foodmarket?characterEncoding=UTF-8";
 public static final String USERNAME = "root";
 public static final String PASSWORD = "321";
 public static Connection conn=null ;  
  
 //使用静态代码块给静态常量成员赋初值
 static
  try 
   Class.forName("com.mysql.jdbc.Driver");
   conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
   catch (ClassNotFoundException e) 
   // TODO Auto-generated catch block
   e.printStackTrace();
   catch (SQLException e) 
   // TODO Auto-generated catch block
   e.printStackTrace();
  
 
 public static Connection getConnection()
  return conn;

UserBean.java

public class UserBean 
 private String uid;
 private String eatname;//用户名
 private String eatprice;//密码
 private String spare;
 //构造方法，带参数
 public UserBean(String uid, String eatname, String eatprice,String spare) 
 this.uid = uid;
 this.eatname = eatname;
 this.eatprice = eatprice;
 this.spare = spare;
 
 //set和get
 public String getNumber() 
 return uid;
 
 public void setNumber(String uid) 
 this.uid = uid;
 
 public String geteatname() 
 return eatname;
 
 public void setName(String eatname) 
 this.eatname = eatname;
 
 public String geteatprice() 
 return eatprice;
 
 public void seteatprice(String eatprice) 
 this.eatprice = eatprice;
 
 
 public String getspare() 
 return spare;
 
 public void setspare(String spare) 
 this.spare = spare;
 
 @Override
 public String toString() 
 // TODO Auto-generated method stub
 return uid+"\\t---\\t"+eatname+"\\t---\\t"+eatprice+"\\t---\\t"+spare;

UserDAO.java

//import com.mysql.jdbc.Connection;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.PreparedStatement;
public class UserDAO 
 //Connection conn=(Connection) JDBCUtlis.getConnection();
 Connection conn = (Connection) JDBCUtils.getConnection();
 public void searchByupdatename(UserBean user) throws SQLException 
 //SET Address = Zhongshan 23, City = Nanjing WHERE LastName = Wilson
 //String sql ="update eat(uid,eatname,eatprice,spare) VALUES(?,?,?,?)";
 String sql ="update eat set uid=?,eatprice=?,spare=? where eatname=?";
 PreparedStatement pstmt =(PreparedStatement) conn.prepareStatement(sql);
 
 pstmt.setString(1, user.getNumber());
 pstmt.setString(2, user.geteatprice());
 pstmt.setString(3, user.getspare());
 pstmt.setString(4, user.geteatname());
 pstmt.executeUpdate();

UserSerivce.java

import java.sql.ResultSet;
import java.sql.SQLException;
public class UserService 
 UserDAO dao = new UserDAO();
public void updatename(UserBean user) throws SQLException 
 // TODO Auto-generated method stub
 dao.searchByupdatename(user);

UserUI.java

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;
 
public class UserUI 
 static UserService service = new UserService();
 public static void main(String[] args) throws SQLException 
 // TODO Auto-generated method stub
 boolean flag=true;
 while (flag) 
 //菜单
 System.out.println("-----熟食包点------");
 System.out.println("--1-添加 ------");
 System.out.println("--2-删除 ------");
 System.out.println("--3-修改 ------");
 System.out.println("--4-查询 ------");
 System.out.println("--5-退出 ------");
 System.out.print("请输入数字，选择菜单功能：");
 
 // 输入选项
 int inputNumber;
 Scanner input = new Scanner(System.in);
 inputNumber = input.nextInt();// 输入整数
 switch (inputNumber) 
 case 1:
 addUser();
 break;
 case 2:
 deletezhong();
 break;
 case 3:
 updatazhong();
 break;
 case 4:
 searchAllUserxian();
 break;
 case 5:
 flag=false;
 break;
 
 
 
// 修改中间
 private static void updatazhong() throws SQLException 
 System.out.println("--1-按照编号修改 ------");
 System.out.println("--2-按照名称修改 ------");
 int inputNumber;
 Scanner input = new Scanner(System.in);
 inputNumber = input.nextInt();// 输入整数
 switch (inputNumber) 
 case 1:
 updateid();
 break;
 case 2:
 updatename();
 break;
 
 
 //按照名称修改
 private static void updatename() throws SQLException 
 // TODO Auto-generated method stub
 System.out.println("输入要修改的食物名称：");
 Scanner in = new Scanner(System.in);
 String inputeatname=in.next();
 UserBean user= service.searchByname(inputeatname);
 if(user!=null)
 
 System.out.println(user.getNumber()+"\\t"+user.geteatname()+"\\t"+user.geteatprice()+"\\t"+user.getspare());
 System.out.println("输入新的食物编号：");
 String inputnewid=in.next();
 user.setNumber(inputnewid);
// System.out.println("输入新的食物名称：");
// String inputnewname=in.next();
// user.setName(inputnewname);
 System.out.println("输入新的食物价格：");
 String inputnewprice=in.next();
 user.seteatprice(inputnewprice);
 System.out.println("输入新的食物库存：");
 String inputnewspare=in.next();
 user.setspare(inputnewspare);
 service.updatename(user);
 
 else
 
 System.out.println("没有找到相关信息！");