jdbc+mysql implements simple user addition, deletion and modification

Complete simple user operations:

implementation code:

package com.service;
import java.util.Date;
public class User {
    
    
    private int sid;
    private String sname;
    private String password;
    private String email;
    private Date brithday;
    get() 
    set()
    tostring() 
}

Configure DBUtils.properties

driverClass=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mysql01?useSSL=false
user=root
password=root

JDBC tools

package com.Tool;

import java.sql.*;
import java.util.ResourceBundle;

public class DBUtils {
    
    
    private static  String url;
    private static String user;
    private static String password;
    private static String driverClass;
    static {
    
    
     //加载配置文件：
        ResourceBundle dbUtils = ResourceBundle.getBundle("DBUtils");
        driverClass = dbUtils.getString("driverClass");
        url = dbUtils.getString("url");
        user=dbUtils.getString("user");
        password=dbUtils.getString("password");
        //加载驱动
        try {
    
    
            Class.forName(driverClass);
        } catch (ClassNotFoundException e) {
    
    
            e.printStackTrace();
        }
    }
    //获取连接
    public static Connection getConnection() throws SQLException {
    
    
        return DriverManager.getConnection(url,user,password);
    }
    //释放资源
    public static void close(Statement statement,Connection connection){
    
    
        if (statement!=null){
    
    
            try {
    
    
                statement.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }
        }
        if (connection!=null){
    
    
            try {
    
    
                connection.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }
        }
    }
    //释放资源
    public static void close(ResultSet resultSet, Statement statement, Connection connection){
    
    

        if (resultSet!=null){
    
    
            try {
    
    
                resultSet.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }

        }
        if (statement!=null){
    
    
            try {
    
    
                statement.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }
        }
        if (connection!=null){
    
    
            try {
    
    
                connection.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }
        }
    }
}

package com.login;

import com.service.Server;
import com.service.User;

import java.sql.SQLException;
import java.sql.SQLOutput;
import java.util.Scanner;

public class Login {
    
    
    static Scanner input=new Scanner(System.in);
    public static void show(){
    
    
        System.out.println("--------------用户系统----------------");
        System.out.println("1.登录账户");
        System.out.println("2.修改密码");
        System.out.println("3.注册用户");
        System.out.println("4.注销用户");
        System.out.println("5.退出账户");
        System.out.println("-------------------------------------");
    }
    public static void input(){
    
    

        System.out.println("请输入用户名:");
        String sname = input.nextLine();
        System.out.println("请输入密  码:");
        String password=input.nextLine();
        User user=new User();
        Server server = new Server();
        server.findUser(sname,password);
        if(server==null){
    
    
            System.out.println("欢迎您："+ user.getSname());
        }else {
    
    
            System.out.println("登录失败");
        }
    }
    public static void update(){
    
    
        System.out.println("请输入用户新密码");
        String password= input.nextLine();
        System.out.println("请输入修改编号 :");
        int number=input.nextInt();
        User user=new User();
        Server server = new Server();
        int update = server.Update(password, number);
        if(update>0){
    
    
            System.out.println("修改成功");
        }else {
    
    
            System.out.println("修改失败");
        }

    }
    public static void Insert(){
    
    
        System.out.println("请输入id:");
        int sid = input.nextInt();

        System.out.println("请输入用户名:");
        String sname = input.next();

        System.out.println("请输入密 码:");
        String password=input.next();

        System.out.println("请输入用户邮箱");
        String email= input.next();

        System.out.println("请输入日期");
        String brithday=input.next();

        Server server = new Server();
        int insert= server.Insert(sid,sname,password,email,brithday);
        if(insert>0){
    
    
            System.out.println("注册成功");
        }else {
    
    
            System.out.println("注册失败");
        }
    }
    public static void Delete(){
    
    
        System.out.println("请输入删除编号:");
        int number=input.nextInt();
        Server server = new Server();
        int delete = server.Delete(number);
        if(delete>0){
    
    
            System.out.println("注销成功");
        }else {
    
    
            System.out.println("注销失败");
        }
    }
}

package com.service;

import com.Tool.DBUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Server {
    
    
    //查询
    public User findUser(String sname, String password)  {
    
    
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;//无参数
        User u=null;
        try {
    
    
            //1加载驱动 并获得连接
            conn = DBUtils.getConnection();
            //2编写sql(预编译)
            String  sql="SELECT * FROM stu WHERE sname=? AND PASSWORD=?";

            //3得到执行SQL小货车
            ps = conn.prepareStatement(sql);
            //4设置参数
            ps.setString(1,sname);
            ps.setString(2,password);
            //输出sql
            System.out.println(sql);
            //5执行sql
            rs = ps.executeQuery();
            //处理结果
            u = null;
            if (rs.next()) {
    
    
                u=new User();
                u.setSid(rs.getInt("sid"));
                u.setSname(rs.getString("sname"));
                u.setPassword(rs.getString("password"));
                u.setEmail(rs.getString("email"));
                u.setBrithday(rs.getDate("brithday"));
            }
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            //释放资源
            DBUtils.close(rs,ps,conn);
        }
        return u;
    }
    //修改
    public int Update(String password, int number) {
    
    
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        int result = 0;
        try {
    
    
            //1.获取链接
            connection = DBUtils.getConnection();
            //2.编写sql(预编译)
            String sql ="UPDATE stu SET sname=? WHERE sid=?";
            //3得到执行SQL小货车
            preparedStatement = connection.prepareStatement(sql);
            //4设置参数

            preparedStatement.setString(1,password);
            preparedStatement.setInt(2,number);
            //输出
            System.out.println(sql);
            //5执行sql
            result = preparedStatement.executeUpdate();
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            DBUtils.close(null,preparedStatement,connection);
        }
        return result;
    }
    //插入注册
    public int Insert(int sid, String sname, String password, String email, String brithday) {
    
    
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        int result = 0;
        try {
    
    
            //1.获取链接
            connection = DBUtils.getConnection();
            //2.编写sql(预编译)
            String sql ="INSERT INTO stu (sid,sname,PASSWORD,email,brithday)VALUES(?,?,?,?,?)";
            //3得到执行SQL小货车
            preparedStatement = connection.prepareStatement(sql);
            //4设置参数
            preparedStatement.setInt(1,sid);
            preparedStatement.setString(2,sname);
            preparedStatement.setString(3,password);
            preparedStatement.setString(4,email);
            preparedStatement.setString(5,brithday);
            //输出
            System.out.println(sql);
            //5执行sql
            result = preparedStatement.executeUpdate();
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            DBUtils.close(null,preparedStatement,connection);
        }
        return result;
    }
    //删除
    public int Delete(int number) {
    
    
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        int result = 0;
        try {
    
    
            //1.获取链接
            connection = DBUtils.getConnection();
            //2.编写sql(预编译)
            String sql ="DELETE FROM stu  WHERE sid=?";
            //3得到执行SQL小货车
            preparedStatement = connection.prepareStatement(sql);
            //4设置参数
            preparedStatement.setInt(1,number);
            //输出
            System.out.println(sql);
            //5执行sql
            result = preparedStatement.executeUpdate();
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            DBUtils.close(null,preparedStatement,connection);
        }
        return result;
    }
}

Test class

package com.Main;
import com.login.Login;
import java.util.Scanner;

public class Test {
    
    
    public static void main(String[] args) {
    
    
        Login.show();
        Scanner input=new Scanner(System.in);
        while (true) {
    
    
            System.out.println("请输入执行操作：");
            int number = input.nextInt();
            switch (number) {
    
    
                case 1:
                    Login.input();
                    break;
                case 2:
                    Login.update();
                    break;
                case 3:
                   Login.Insert();
                    break;
                case 4:
                    Login.Delete();
                    break;
                case 5:
                    System.out.println("5.退出账户");
                    System.exit(1);
            }
        }
    }
}