Cara menggunakan Java+mysql untuk melaksanakan sistem pengurusan status pelajar

1. Jadual pangkalan data Myswql

Projek menggunakan pangkalan data mysql dan mempunyai 2 jadual. Jadual pengguna digunakan untuk pengesahan log masuk, dan jadual pelajar digunakan untuk penambahan, pemadaman, pengubahsuaian dan pertanyaan.

creat table t_user(
id int primary key auto_increment,
login_name varchar(255),
login_pwd  varchar(255),
real_name varchar(255),
);
insert into t_user(id,login_name,login_pwd,real_name)
values('akm'，"123",'萝卜蹲')；
CREATE TABLE t_user(
 id char(12) PRIMARY KEY,
 name char(6),
 pwd varchar(255),
);

2. Pelaksanaan fungsional

1. Demonstrasi praktikal

1.1 Antara muka log masuk

Dalam input pengguna: akm
Input dalam medan kata laluan: 123
Klik butang log masuk untuk memasuki sistem secara terus.

Jika anda tersilap memasukkan, bar status akan menunjukkan kegagalan log masuk dan akaun log masuk serta kata laluan akan dikosongkan.

1.2 Antara muka utama sistem

Antara muka utama sistem terdiri daripada 5 butang

Untuk menambah maklumat pelajar, sila pilih butang tambah pada antara muka utama dan klik untuk memasuki antara muka tambah seperti yang ditunjukkan di atas. Tambahkan maklumat pelajar yang sepadan, ID, nama, umur, status pelajar, dsb. pada antara muka.

1.3 Pertanyaan maklumat

Soal maklumat pelajar mengikut id.

1.4 Melintasi maklumat

1.5 Padam maklumat

Masukkan ID untuk dipadamkan terus.

1.6 Kemas kini maklumat

Kod sumber fail 2.test.java

Projek ini hanya mempunyai satu ujian fail, tiada Enkapsulasi, rakan-rakan yang memerlukannya boleh merangkumnya sendiri.

Kodnya adalah seperti berikut:

package com.company;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;
import java.sql.Statement;
import java.util.Scanner;
public class Test {
    static  Connection conn ;
    static Statement statement;
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        login();
        }
    public static void control() {
        JFrame jf = new JFrame("学生学籍管理系统");
        jf.setLayout(new FlowLayout(FlowLayout.LEFT));
        jf.setBounds(400, 300, 300, 200);
        JButton button = new JButton("更新");
        JButton button1=new JButton("遍历");
        JButton button2=new JButton("删除");
        JButton button3=new JButton("添加");
        JButton button4=new JButton("查询");
        jf.add(button);
        jf.add(button1);
        jf.add(button2);
        jf.add(button3);
        jf.add(button4);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                update();
            }
        });
        button1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                query();
            }
        });
        button2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                delete();
            }
        });
        button3.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                insert();
            }
        });
        button4.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {onequery();}

        });
        jf.setVisible(true);
        jf.setResizable(false);
        button.setSize(40, 20);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void update() {
        conn = getConnection();
        JFrame jf = new JFrame("学生学籍管理系统");
        jf.setLayout(new FlowLayout(FlowLayout.LEFT));
        jf.setBounds(400, 300, 300, 200);
        JLabel label1 = new JLabel("年龄");
        JTextField agetext = new JTextField("", 10);
        JLabel label2 = new JLabel("id");
        JTextField idtext = new JTextField("", 10);
        JLabel label3 = new JLabel("学籍");
        JTextField addresstext = new JTextField("", 10);
        JLabel label4 = new JLabel("姓名");
        JTextField nametext = new JTextField("", 5);
        JTextField out = new JTextField("更新状态", 20);
        JButton button = new JButton("更新");
        jf.add(label1);
        jf.add(agetext);
        jf.add(label2);
        jf.add(idtext);
        jf.add(label3);
        jf.add(addresstext);
        jf.add(label4);
        jf.add(nametext);
        jf.add(out);
        jf.add(button);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                PreparedStatement ps=null;
                String age = agetext.getText();
                String id = idtext.getText();
                String address= addresstext.getText();
                String name=nametext.getText();
                try {
                    // 更新数据的sql语句
                    String sql = "update student set age =? , address =?, name=? where  id = ?";
                    ps=conn.prepareStatement(sql);
                    ps.setString(1,agetext.getText());
                    ps.setString(2,addresstext.getText());
                    ps.setString(3,nametext.getText());
                    ps.setString(4,idtext.getText());
                    int count = ps.executeUpdate();//记录操作次数
                    // 输出插入操作的处理结果
                    System.out.println("user表中更新 " + count + " 条数据");
                    ps.close();
                    //关闭数据库连接
                    conn.close();
                    out.setText("更新成功！！！！！！！！");
                    // 创建用于执行静态sql语句的Statement对象，st属局部变量
                } catch (SQLException a) {
                    System.out.println("更新数据失败");
                }

            }

        });
        jf.setVisible(true);
        jf.setResizable(false);
        button.setSize(40, 20);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void query() {
        PreparedStatement ps=null;
        conn = getConnection();
        JFrame jf = new JFrame("学生学籍管理系统");
        jf.setLayout(null);
        jf.setBounds(400, 300, 350, 200);
        JButton button = new JButton("查询");
        JTextArea jm=new JTextArea("ID\t姓名\t年龄\t学籍");//显示界面
        jm.setBounds(10,50,350,100);//定义显示界面位置
        jf.add(button);
        jf.add(jm);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                PreparedStatement ps=null;
                try {
                    String sql = "select * from Student";
                    //创建用于执行静态sql语句的Statement对象，statement属局部变量
                    statement = conn.createStatement();//获取操作对象
                    ResultSet resultSet = statement.executeQuery(sql);// executeQuery执行单个SQL语句，返回单个ResultSet对象是
                    while (resultSet.next())//循环没有数据的时候返回flase退出循环
                    {
                        Integer Id = resultSet.getInt("id");//resultSet.next()是一个光标
                        String name = resultSet.getString("name");//getString返回的值一定是string
                        Integer age = resultSet.getInt("age");
                        String address=resultSet.getString("address");
                        //String adress = resultSet.getString("adress");
                        //输出查到的记录的各个字段的值
                        jm.append("\n"+Id + "\t" + name + "\t" + age+ "\t" + address );
                    }
                    statement.close();
                    conn.close();
                }catch (SQLException b){
                    System.out.println("查询失败！！！！！！！！");
                }
            }
        });
        jf.setVisible(true);
        jf.setResizable(false);
        button.setSize(40, 20);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void delete() {
        conn = getConnection();
        JFrame jf = new JFrame("学生学籍管理系统");
        jf.setLayout(new FlowLayout(FlowLayout.LEFT));
        jf.setBounds(400, 300, 300, 200);
        JLabel label2 = new JLabel("id");
        JTextField idtext = new JTextField("", 10);
        JTextField out = new JTextField("删除状态", 20);
        JButton button = new JButton("删除");
        jf.add(label2);
        jf.add(idtext);
        jf.add(out);
        jf.add(button);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String id = idtext.getText();
                PreparedStatement ps=null;
                try {
                    // 删除数据的sql语句
                    String sql = "delete from Student  where id = ?";
                    ps=conn.prepareStatement(sql);
                    ps.setString(1,idtext.getText());
                    int count = ps.executeUpdate();//记录操作次数
                    // 输出插入操作的处理结果
                    System.out.println("student表中删除 " + count + " 条数据");
                    ps.close();
                    out.setText("删除成功！！！！！！！！");
                    // 关闭数据库连接
                    conn.close();
                } catch (SQLException c) {
                    System.out.println("删除数据失败");
                }
            }
        });
        jf.setVisible(true);
        jf.setResizable(false);
        button.setSize(40, 20);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }
    public static void insert() {
        // 首先要获取连接，即连接到数据库
        conn = getConnection();
        JFrame jf = new JFrame("学生学籍管理系统");
        jf.setLayout(new FlowLayout(FlowLayout.LEFT));
        jf.setBounds(400, 300, 300, 200);
        JLabel label3 = new JLabel("id");
        JTextField idtext = new JTextField("", 10);
        JLabel label1 = new JLabel("年龄");
        JTextField agetext = new JTextField("", 10);
        JLabel label2 = new JLabel("姓名");
        JTextField nametext = new JTextField("", 10);
        JLabel label4 = new JLabel("学籍");
        JTextField addresstext = new JTextField("", 5);
        JTextField out = new JTextField("添加状态", 20);
        JButton button = new JButton("添加");
        jf.add(label3);
        jf.add(idtext);
        jf.add(label1);
        jf.add(agetext);
        jf.add(label2);
        jf.add(nametext);
        jf.add(label4);
        jf.add(addresstext);
        jf.add(out);
        jf.add(button);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String age = agetext.getText();
                String name = nametext.getText();
                String  id=idtext.getText();
                String address=addresstext.getText();
                try {
                    PreparedStatement ps=null;
                    // 插入数据的sql语句
                    String sql = "INSERT INTO Student( id,age,name,address) VALUES ( ?,?,?,?)";
                    ps=conn.prepareStatement(sql);
                    ps.setString(1,idtext.getText());
                    ps.setString(2,agetext.getText());
                    ps.setString(3,nametext.getText());
                    ps.setString(4,addresstext.getText());
                    int count = ps.executeUpdate();//记录操作次数
                    // 输出插入操作的处理结果
                    System.out.println("向user表中插入 " + count + " 条数据");
                    ps.close();
                    out.setText("添加成功！！！！！！！！");
                    // 关闭数据库连接
                    conn.close();
                } catch (SQLException d) {
                    System.out.println("插入数据失败" + d.getMessage());
                }

            }
        });
        jf.setVisible(true);
        jf.setResizable(false);
        button.setSize(40, 20);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static boolean login(){
        conn = getConnection();
        JFrame jf = new JFrame("学生学籍管理系统");
        jf.setLayout(new FlowLayout(FlowLayout.LEFT));
        jf.setBounds(400, 300, 300, 200);
        JLabel label1 = new JLabel("用户名");
        JTextField usernametext = new JTextField("", 20);
        JLabel label2 = new JLabel("密码");
        JPasswordField pwdtext = new JPasswordField("", 20);
        JTextField out = new JTextField("登录状态", 20);
        JButton button = new JButton("登录");
        jf.add(label1);
        jf.add(usernametext);
        jf.add(label2);
        jf.add(pwdtext);
        jf.add(out);
        jf.add(button);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 插入数据的sql语句
                PreparedStatement ps=null;
                try {
                    statement = conn.createStatement();//获取操作对象
                    String x = usernametext.getText();
                    String y = pwdtext.getText();
                    String sql ="select * from user";
                    ResultSet resultSet = statement.executeQuery(sql);
                    while(resultSet.next()){
                        String a=resultSet.getString("login_name");
                        String b=resultSet.getString("login_pwd");
                        if(a.equals(x)&&b.equals(y))
                        {
                            control();
                            out.setText("!!!!!登录成功!!!!!");
                        }
                        else if(x!=a&&y!=b){
                            out.setText("登录失败，请重新输入");
                        }
                    }
                    usernametext.setText("");
                    pwdtext.setText("");
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        });
        jf.setVisible(true);
        jf.setResizable(false);
        button.setSize(40, 20);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        boolean ok = true;
        return ok;
    }
    public static void onequery() {
        PreparedStatement ps=null;
        conn = getConnection();
        JFrame jf = new JFrame("学生学籍管理系统");
        jf.setLayout(new FlowLayout(FlowLayout.LEFT));
        jf.setBounds(400, 300, 350, 200);
        JLabel label3 = new JLabel("id");
        JTextField idtext = new JTextField("", 10);
        JLabel label1 = new JLabel("条件");
        JTextField atext = new JTextField("", 10);
        JButton button = new JButton("查询");
        //JTextArea jm=new JTextArea("ID\t姓名\t年龄\t学籍");//显示界面
        //jm.setBounds(10,50,350,100);//定义显示界面位置
        jf.add(label3);
        jf.add(idtext);
        jf.add(button);
        //jf.add(jm);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                PreparedStatement ps=null;
                String id=idtext.getText();
                conn = getConnection();
                try {
                    String sql = "select * from student where id = ?";
                    //创建用于执行静态sql语句的Statement对象，statement属局部变量
                    ps=conn.prepareStatement(sql);//获取操作对象
                    ps.setString(1,idtext.getText().toString());
                    ResultSet resultSet =  ps.executeQuery();// executeQuery执行单个SQL语句，返回单个ResultSet对象是
                    while (resultSet.next())//循环没有数据的时候返回flase退出循环
                    {
                        Integer Id = resultSet.getInt("id");//resultSet.next()是一个光标
                        String name = resultSet.getString("name");//getString返回的值一定是string
                        Integer age = resultSet.getInt("age");
                        String address=resultSet.getString("address");
                        System.out.println(Id + " " + name + " " + age + " "+ address + " " );
                        //输出查到的记录的各个字段的值
                        //jm.append("\n"+Id + "\t" + name + "\t" + age+ "\t" + address );
                    }
                    statement.close();
                    conn.close();
                }catch (SQLException m){
                    System.out.println(m.getMessage());
                    System.out.println("查询失败！！！！！！！！");
                }
            }
        });
        jf.setVisible(true);
        jf.setResizable(false);
        button.setSize(40, 20);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static Connection getConnection(){
        //创建用于连接数据库的Connection对象
        Connection connection = null;
        try {
            // 加载Mysql数据驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            System.out.println("数据库驱动加载成功");
            String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai";
            // 创建数据连接
            connection = DriverManager.getConnection(url, "root", "root");
            System.out.println("数据库连接成功");
        }catch (ClassNotFoundException | SQLException e){
            System.out.println("数据库连接失败" + e.getMessage());//处理查询结果
        }
        return connection;
    }

}

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