学生信息管理系统数据库，实现增，改，查简单功能

一. 程序说明
1.程序使用JAVA程序连接MYSQL数据库。
2.学生信息管理系统分为三个表：
student,course,student_course
3.在mysql中分别创建：

create table student(name varchar(20),no varchar(20),age varchar(20),sex varchar(20),primary key(no));

create table course(c_name varchar(20),c_no varchar(20),c_credit varchar(20),PRIMARY KEY(c_no));

create table sc(no varchar(20),c_no varchar(20),sc_grade varchar(20),foreign key (no) references student(no),foreign key (c_no) references course(c_no));
4.临时写的，代码写的很乱，也没写返回功能。
二. 运行截图
1.登录界面，错误会提示重新输入，正确会创建新窗口



2. 选择一个表进行操作

3.点击查询

4.增加一位学生信息

5.删除学号为006的学生

三. 源代码

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.sql.*;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class Test {

	public static void main(String[] args) {
		/*登陆面板*/
		JFrame f= new JFrame("学生选课系统");
		f.setSize(400, 300);
		f.setLocationRelativeTo(null);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);	
		f.setLayout(new GridLayout(5,1));
		JLabel name1 = new JLabel("   用户名:");
		JLabel password1 = new JLabel("   密码:");
		JTextField name2 = new JTextField();
		JTextField password2 = new JTextField();
		JButton bt = new JButton("登陆");
		f.add(name1);
		f.add(name2);
		f.add(password1);
		f.add(password2);
		f.add(bt);
		f.setVisible(true);
		
		bt.addActionListener(e->{
			String name3 = name2.getText();
			String password3 =password2.getText();
			if(name3.equals("root") & password3.equals("123")) {
				JDialog d1 = new JDialog(f, "提示",true);
				d1.setSize(200, 100);
				d1.setLocationRelativeTo(null);
				d1.add(new JLabel("登陆成功"),BorderLayout.CENTER);
				d1.setVisible(true);
				f.setVisible(false);

			    //加载MYSQL JDBC驱动程序   
				try {
					Class.forName("com.mysql.jdbc.Driver"); 			
				}
				catch (Exception e1) {
					e1.printStackTrace();
				}
				
				
				//新的窗体，进行管理操作
				JFrame f2 = new JFrame("学生选课管理系统");
				f2.setSize(500, 400);
				f2.setLocationRelativeTo(null);
				f2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);	
				f2.setVisible(true);
				
				
				//右面板，用于显示操作的结果
				JPanel right = new JPanel();
				right.setLayout(new BorderLayout());
				right.add(new JLabel("            查询结果如下：                            "),BorderLayout.NORTH);
				JTextArea ta1 = new JTextArea(20,5);
				right.add(ta1,BorderLayout.SOUTH);
		
				
				
				
				//左边面板，用于选择操作的数据表
				JPanel left = new JPanel();
				left.setLayout(new GridLayout(4,1,10,10));
				JLabel leftl = new JLabel("请点击按钮选择要操作的数据表");
				JButton leftbt1 = new JButton("TABLE: student");
				JButton leftbt2 = new JButton("TABLE: course");
				JButton leftbt3 = new JButton("TABLE: sc");
				left.add(leftl);
				left.add(leftbt1);
				left.add(leftbt2);
				left.add(leftbt3);
				
				//student按钮的监听器
				leftbt1.addActionListener(a->{
					f2.remove(left);
					JPanel left1 = new JPanel();
					left1.setLayout(new GridLayout(5,1,10,10));
					JButton leftbt11 = new JButton("查询所有学生的信息");
					//第一个按钮的监听器
					leftbt11.addActionListener(b->{
						//连接数据库
						try {
							Connection connect = DriverManager.getConnection(
									"jdbc:mysql://localhost:3306/XUANKE","root","123");
							Statement stmt = connect.createStatement();
							ResultSet rs = stmt.executeQuery("select * from student;");
							StringBuffer sb1 = new StringBuffer("\n\n\n|姓名| 学号 | 年龄 |性别 |\n");
							while (rs.next()) {
								String str1 = new String("| "+rs.getString("name")+"  | "+rs.getString("no")+" | "+rs.getString("age")+"   | "+rs.getString("sex")+"|\n");
								sb1.append(str1);
							}
							ta1.setText(sb1.toString());
							right.validate();
						}
						catch (Exception e1) {
							System.out.print("get data error!");
							e1.printStackTrace();
						}
					});
				//第二个按钮的监听器
				JPanel left11 = new JPanel();
				left11.setLayout(new GridLayout(1,4,10,10));
				JTextField tf1 = new JTextField();
				JTextField tf2 = new JTextField();
				JTextField tf3 = new JTextField();
				JTextField tf4 = new JTextField();
				left11.add(tf1);
				left11.add(tf2);
				left11.add(tf3);
				left11.add(tf4);
				left1.add(left11);
				
				JButton leftbt12  = new JButton("按照上方填写内容增加一位学生的信息,");
				leftbt12.addActionListener(c->{
					String str_tf1 = tf1.getText();
					String str_tf2 = tf2.getText();
					String str_tf3 = tf3.getText();
					String str_tf4 = tf4.getText();
					//连接数据库
					try {
						Connection connect = DriverManager.getConnection(
								"jdbc:mysql://localhost:3306/XUANKE","root","123");
						Statement stmt = connect.createStatement();
						String str1 = new String("insert into student values('"+str_tf1+"','"+str_tf2+"','"+str_tf3+"','"+str_tf4+"');");
						stmt.executeUpdate(str1);
						ResultSet rs = stmt.executeQuery("select * from student;");
						StringBuffer sb1 = new StringBuffer("\n\n\n|姓名| 学号 | 年龄 |性别 |\n");
						while (rs.next()) {
							String str11 = new String("| "+rs.getString("name")+"  | "+rs.getString("no")+" | "+rs.getString("age")+"   | "+rs.getString("sex")+"|\n");
							sb1.append(str11);
						}
						ta1.setText(sb1.toString());
						right.validate();
					}
					catch (Exception e1) {
						System.out.print("get data error!");
						e1.printStackTrace();
					}
				});
				
				//第三个按钮的监听器
				JButton leftbt13  = new JButton("按照上方输入的学号删除一位学生的信息");
				JTextField tf5= new JTextField();
				leftbt13.addActionListener(c->{
					//连接数据库
					try {
						Connection connect = DriverManager.getConnection(
								"jdbc:mysql://localhost:3306/XUANKE","root","123");
						Statement stmt = connect.createStatement();
						String  str = new String("delete from student where no='"+tf5.getText()+"';");
						stmt.executeUpdate(str);
						ResultSet rs = stmt.executeQuery("select * from student;");
						StringBuffer sb1 = new StringBuffer("\n\n\n|姓名| 学号 | 年龄 |性别 |\n");
						while (rs.next()) {
							String str1 = new String("| "+rs.getString("name")+"  | "+rs.getString("no")+" | "+rs.getString("age")+"   | "+rs.getString("sex")+"|\n");
							sb1.append(str1);
						}
						ta1.setText(sb1.toString());
						right.validate();
					}
					catch (Exception e1) {
						System.out.print("get data error!");
						e1.printStackTrace();
					}
				});
				
				
				
				
				left1.add(leftbt11);
				left1.add(left11);
				left1.add(leftbt12);
				left1.add(tf5);
				left1.add(leftbt13);
				f2.add(left1);
				f2.validate();
				});
				
				
				
				//以下为粘贴的内容
				//student按钮的监听器
				leftbt2.addActionListener(a->{
					f2.remove(left);
					JPanel left2 = new JPanel();
					left2.setLayout(new GridLayout(5,1,10,10));
					JButton leftbt11 = new JButton("查询所有课程的信息");
					//第一个按钮的监听器
					leftbt11.addActionListener(b->{
						//连接数据库
						try {
							Connection connect = DriverManager.getConnection(
									"jdbc:mysql://localhost:3306/XUANKE","root","123");
							Statement stmt = connect.createStatement();
							ResultSet rs = stmt.executeQuery("select * from course;");
							StringBuffer sb1 = new StringBuffer("\n\n\n|课程名| 课程号 | 课程学分|\n");
							while (rs.next()) {
								String str1 = new String("| "+rs.getString("c_name")+"  | "+rs.getString("c_no")+" | "+rs.getString("c_credit")+"   | \n");
								sb1.append(str1);
							}
							ta1.setText(sb1.toString());
							right.validate();
						}
						catch (Exception e1) {
							System.out.print("get data error!");
							e1.printStackTrace();
						}
					});
				//第二个按钮的监听器
				JPanel left21= new JPanel();
				left21.setLayout(new GridLayout(1,3,10,10));
				JTextField tf1 = new JTextField();
				JTextField tf2 = new JTextField();
				JTextField tf3 = new JTextField();
				
				left21.add(tf1);
				left21.add(tf2);
				left21.add(tf3);
			//	left2.add(left21);
				
				JButton leftbt12  = new JButton("按照上方填写内容增加一门课程的信息,");
				leftbt12.addActionListener(c->{
					String str_tf1 = tf1.getText();
					String str_tf2 = tf2.getText();
					String str_tf3 = tf3.getText();
				
					//连接数据库
					try {
						Connection connect = DriverManager.getConnection(
								"jdbc:mysql://localhost:3306/XUANKE","root","123");
						Statement stmt = connect.createStatement();
						String str1 = new String("insert into course values('"+str_tf1+"','"+str_tf2+"','"+str_tf3+"');");
						stmt.executeUpdate(str1);
						ResultSet rs = stmt.executeQuery("select * from course;");
						StringBuffer sb1 = new StringBuffer("\n\n\n|课程名| 课程号 | 课程学分 |\n");
						while (rs.next()) {
							String str11 = new String("| "+rs.getString("c_name")+"  | "+rs.getString("c_no")+" | "+rs.getString("c_credit")+" |\n");
							sb1.append(str11);
						}
						ta1.setText(sb1.toString());
						right.validate();
					}
					catch (Exception e1) {
						System.out.print("get data error!");
						e1.printStackTrace();
					}
				});
				
				//第三个按钮的监听器
				JButton leftbt13  = new JButton("按照上方输入的课程号删除一门课程的信息");
				JTextField tf4= new JTextField();
				leftbt13.addActionListener(c->{
					//连接数据库
					try {
						Connection connect = DriverManager.getConnection(
								"jdbc:mysql://localhost:3306/XUANKE","root","123");
						Statement stmt = connect.createStatement();
						String  str = new String("delete from course where c_no='"+tf4.getText()+"';");
						stmt.executeUpdate(str);
						ResultSet rs = stmt.executeQuery("select * from course;");
						StringBuffer sb1 = new StringBuffer("\n\n\n|课程名| 课程号 | 课程学分 |\n");
						while (rs.next()) {
							String str1 = new String("| "+rs.getString("c_name")+"  | "+rs.getString("c_no")+" | "+rs.getString("c_credit")+" |\n");
							sb1.append(str1);
						}
						ta1.setText(sb1.toString());
						right.validate();
					}
					catch (Exception e1) {
						System.out.print("get data error!");
						e1.printStackTrace();
					}
				});
				
				
				
				
				left2.add(leftbt11);
				left2.add(left21);
				left2.add(leftbt12);
				left2.add(tf4);
				left2.add(leftbt13);
				f2.add(left2);
				f2.validate();
				});
				
				
				

				
				f2.add(left,BorderLayout.WEST);
				f2.add(right,BorderLayout.EAST);
			}else {
				JDialog d2 = new JDialog(f, "提示",true);
				d2.setSize(250, 100);
				d2.setLocationRelativeTo(null);
				d2.add(new JLabel("登陆失败,请重新输入用户名与密码"),BorderLayout.CENTER);
				d2.setVisible(true);
			}
		});		
	}
}