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本帖最后由 guhusf 于 2021-12-25 18:59 编辑
- package 复习;
- import java.awt.*;
- import java.awt.event.ActionEvent;
- import java.awt.event.ActionListener;
- import java.awt.event.WindowAdapter;
- import java.awt.event.WindowEvent;
- import java.sql.*;
- import java.util.*;
- import java.util.Vector;
- import javax.swing.*;
- import javax.swing.event.ListSelectionEvent;
- import javax.swing.event.ListSelectionListener;
- import javax.swing.table.DefaultTableModel;
- class lx implements ActionListener,ListSelectionListener{
- public JFrame f =null;
- public JPanel p = null;
- public JButton bz,bs,bg,bc = null;
- public JTable t = null;
- public DefaultTableModel dtm = null;
- public JScrollPane jp = null;
- Vector vt = new Vector();
- Vector vd = new Vector();
- lx(){
- f = new JFrame("kk");
- p = new JPanel();
- bz = new JButton("增");
- bs = new JButton("删");
- bg = new JButton("改");
- bc = new JButton("查");
- vt.add("ID");vt.add("name");vt.add("java");vt.add("C");
- dtm = new DefaultTableModel();
- t = new JTable(dtm);
- jp = new JScrollPane(t);
- p.setLayout(new GridLayout(1,4));
- p.add(bz);p.add(bs);p.add(bg);p.add(bc);
- f.setLayout(new BorderLayout());
- f.add(jp,BorderLayout.CENTER);
- f.add(p,BorderLayout.SOUTH);
- bz.addActionListener(this);
- bs.addActionListener(this);
- bg.addActionListener(this);
- bc.addActionListener(this);
- t.getSelectionModel().addListSelectionListener(this);
- f.setSize(400,200);
- f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
- f.setVisible(true);
- Shujuku.connect();
- f.addWindowListener(new WindowAdapter() {
- public void windowClosing(WindowEvent e) {
- Shujuku.close();
- System.exit(0);
- }
- });
- }
- public static void main(String[] args) {
- // TODO Auto-generated method stub
- new lx();
- }
- @Override
- public void valueChanged(ListSelectionEvent e) {
- // TODO Auto-generated method stub
-
- }
- @Override
- public void actionPerformed(ActionEvent e) {
- // TODO Auto-generated method stub
- if(e.getSource()==bz) {
- Scanner sc = new Scanner(System.in);
- String ID,name,java,C;
- System.out.println("请输入学号:");
- ID = sc.nextLine();
- System.out.println("请输入姓名:");
- name = sc.nextLine();
- System.out.println("请输入Java成绩:");
- java = sc.nextLine();
- System.out.println("请输入C语言成绩:");
- C = sc.nextLine();
- String sql = "insert into score(ID,name,java,C) values('"+ID+"','"+name+"','"+java+"','"+C+"')";
- Shujuku.Update(sql);
- Vector<String> row = new Vector<String>();
- row.add(ID);row.add(name);row.add(java);row.add(C);
- dtm.addRow(row);
- }
- if(e.getSource()==bc) {
- String sql = "select * from score";
- ResultSet rs = Shujuku.query(sql);
- try {
- while(rs.next()) {
- Vector row = new Vector<String>();
- row.add(rs.getString(1));
- row.add(rs.getString(2));
- row.add(rs.getString(3));
- row.add(rs.getString(4));
- vd.add(row);
- }
- dtm.setDataVector(vd,vt);
- }catch(SQLException e1) {
- e1.printStackTrace();
- }
- }
- if(e.getSource()==bs) {
- int row = t.getSelectedRow();
- String id = (String)t.getValueAt(row, 0);
- String sql = "delete from score where ID ='"+id+"'";
- Shujuku.Update(sql);
- dtm.removeRow(row);
- }
- if(e.getSource()==bg) {
- String ID,sql = null;
- int row = t.getSelectedRow();
- int col = t.getSelectedColumn();
- System.out.println("请输入修改后的值");
- Scanner sc = new Scanner(System.in);
- String x = sc.nextLine();
- if(col==0) {
- ID = (String)t.getValueAt(row, col);
- sql = "update score set ID = '"+x+"'where ID = '"+ID+"'";
- }
- else {
- ID = (String)t.getValueAt(row, 0);
- if(col == 1) {
- sql = "update score set name='"+x+"'where ID = '"+ID+"'";
- }
- else if(col == 2) {
- sql = "update score set java = '"+x+"'where ID = '"+ID+"'";
- }
- else if (col == 3) {
- sql = "update score set C = '"+x+"'where ID= '"+ID+"'";
- }
- t.setValueAt(x, row, col);
- Shujuku.Update(sql);
- }
- }
- }
- }
- class Shujuku{
- public static Connection coon = null;
- public static Statement stmt = null;
- public static ResultSet rs = null;
- public static Connection connect() {
- try {
- Class.forName("com.mysql.cj.jdbc.Driver");
- String Url = "jdbc:mysql://localhost:3306/student";
- String User = "root";
- String Password = "010828";
- coon = DriverManager.getConnection(Url,User,Password);
- System.out.println("操作成功");
- return coon;
- }catch(ClassNotFoundException | SQLException e) {
- e.printStackTrace();
- }
- return null;
- }
- public static ResultSet query(String sql) {
- // TODO Auto-generated method stub
- try {
- coon = connect();
- stmt = coon.createStatement();
- rs = stmt.executeQuery(sql);
- }catch(SQLException e2) {
- e2.printStackTrace();
- }
- return rs;
- }
- public static void Update(String sql) {
- // TODO Auto-generated method stub
- try {
- coon = connect();
- stmt = coon.createStatement();
- stmt.execute(sql);
- }catch(SQLException e) {
- e.printStackTrace();
- }
- }
- public static void close() {
- // TODO Auto-generated method stub
- try {
- if (rs != null)
- rs.close();
- if (stmt != null)
- stmt.close();
- if (coon != null)
- coon.close();
- } catch (SQLException e) {
- JOptionPane.showMessageDialog(null, e.getMessage());
- e.printStackTrace();
- }
- }
- }
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