Java课程设计源码——学生信息管理系统 SQL

2022.6.9 更新
这个课程作业的代码有小伙伴反馈有问题（数据库无法连接等），但博主最近学业不用Java了，暂时没时间看，如果有同学有解决方案，可以在下面评论帮助一下其他同学。实在抱歉啦。


package shujuku;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;import java.util.*;
import java.sql.*;
import javax.swing.table.*;class allstudent extends JFrame implements ActionListener {JMenu jm = new JMenu("信息");JMenuItem j1 = new JMenuItem("显示信息");JMenuItem j2 = new JMenuItem("退出");JMenuBar JBar = new JMenuBar();allstudent() {super("学生信息记录表");setSize(540, 400);setLocation(320, 240);//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JBar.add(jm);jm.add(j1);jm.add(j2);setJMenuBar(JBar);j1.addActionListener(this);j2.addActionListener(this);setVisible(true);}public void actionPerformed(ActionEvent e) {if (e.getSource() == j2)this.dispose();else if (e.getSource() == j1) {int i, j, row;try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");} catch (ClassNotFoundException ce) {}try {Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");Statement stm = con.createStatement();ResultSet rs = stm.executeQuery("select * from info");displayResultSet(rs);rs.close();stm.close();//con.close();} catch (SQLException se) {}}}public void displayResultSet(ResultSet rs) throws SQLException {boolean moreRecords = rs.next();if (!moreRecords) {JOptionPane.showMessageDialog(null, "结果无记录", "无记录", JOptionPane.INFORMATION_MESSAGE);//return;}Vector rows = new Vector();Vector columnHeads = new Vector();try {ResultSetMetaData rsmd = rs.getMetaData();for (int i = 1; i <= rsmd.getColumnCount(); i++)columnHeads.addElement(rsmd.getColumnName(i));do {rows.addElement(getNextRow(rs, rsmd));} while (rs.next());JTable table = new JTable(rows, columnHeads);table.setSize(new Dimension(400, 400));JScrollPane scroller = new JScrollPane(table);Container c = getContentPane();c.add(scroller, BorderLayout.CENTER);c.validate();} catch (SQLException e) {e.printStackTrace();}}private Vector getNextRow(ResultSet rs, ResultSetMetaData rsmd) throws SQLException {Vector currentRow = new Vector();for (int i = 1; i <= rsmd.getColumnCount(); i++)currentRow.addElement(rs.getString(i));return currentRow;}// public static void main(String[] args) {//      new allstudent();
//  }
}

/** 功能：用来和数据库SQLserver进行连接，以及相应的查询方法。*/
package shujuku;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JOptionPane;//写一个类，用来与数据库建立连接，并且查询数据
class GetSQL {// 设定用户名和密码static String userword;static String pwd;static String english;static String num;static String name;static String chinese;static String zhengzhi;static String math;static String age;static String salary;static String sex;static String zhicheng;static String teanum;static String teaname;static Connection ct = null;static PreparedStatement ps = null;static ResultSet rs = null;// 用于连接数据库的方法，可用于子类的继承public static void ConnectSQL() {try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");ct = DriverManager.getConnection( "jdbc:sqlserver://localhost:1433;databaseName=StudentManager","sa","123456");System.out.println("The SQL is connected");} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}// 用于向数据库进行查询的方法public static void querystu(String s,String username) {// 创建火箭车try { ps = ct.prepareStatement("select * from info where 权限=? and 用户名=? ");// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式ps.setString(1, s);ps.setString(2, username);// ResultSet结果集,可以把ResultSet理解成返回一张表行的结果集rs = ps.executeQuery();// 循环取出if (rs.next()) {// 将教师的用户名和密码取出userword = rs.getString(2);pwd = rs.getString(3);System.out.println("成功获取到密码和用户名from数据库");//System.out.println(userword + "\t" + pwd + "\t");}else{JOptionPane.showMessageDialog(null, "没有此用户，请重新输入！", "提示消息", JOptionPane.WARNING_MESSAGE);}} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}//在教师表中进行查询public static void querytea(String s,String name ) {// 创建火箭车try {ps = ct.prepareStatement("select * from info_tea where 权限=? and 用户名=? ");// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式ps.setString(1, s);ps.setString(2, name);// ResultSet结果集,可以把ResultSet理解成返回一张表行的结果集rs = ps.executeQuery();// 循环取出if (rs.next()) {// 将教师的用户名和密码取出userword = rs.getString(2);pwd = rs.getString(3);System.out.println("成功获取到密码和用户名from数据库");//System.out.println(userword + "\t" + pwd + "\t");}else{JOptionPane.showMessageDialog(null, "没有此用户，请重新输入！", "提示消息", JOptionPane.WARNING_MESSAGE);}} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}//从数据库中根据学号或者教工号来查询数据，并且填入表格。public static void getdatastu(String s) {// 创建火箭车try {ps = ct.prepareStatement("select * from info where 学号 =? ");// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式ps.setString(1, s);// ResultSet结果集,大家可以把ResultSet理解成返回一张表行的结果集rs = ps.executeQuery();if(rs.next()) {// 将学生的用户名和密码取出num = rs.getString(4);name = rs.getString(5);math = rs.getString(6);chinese = rs.getString(7);english = rs.getString(8);zhengzhi = rs.getString(9);}else{JOptionPane.showMessageDialog(null, "沒有此学生，请重新输入", "提示消息", JOptionPane.WARNING_MESSAGE);}} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}public static void getdatatea(String s) {// 创建火箭车try {ps = ct.prepareStatement("select * from info_tea where 教师编号 =? ");// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式ps.setString(1, s);// ResultSet结果集,大家可以把ResultSet理解成返回一张表行的结果集rs = ps.executeQuery();if(rs.next()) {// 将教师的用户名和密码取出teanum = rs.getString(4);teaname = rs.getString(5);sex = rs.getString(6);salary = rs.getString(7);zhicheng = rs.getString(8);age = rs.getString(9);}else{JOptionPane.showMessageDialog(null, "沒有此教师，请重新输入", "提示消息", JOptionPane.WARNING_MESSAGE);}} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}


package shujuku;import javax.swing.*;import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;public class Login extends JFrame implements ActionListener {// 定义登录界面的组件JButton jb1, jb2, jb3 = null;JRadioButton jrb1, jrb2 = null;JPanel jp1, jp2, jp3, jp4 = null;JTextField jtf = null;JLabel jlb1, jlb2, jlb3 = null;JPasswordField jpf = null;ButtonGroup bg = null;// 菜单项JMenuBar jmb = null;JMenu jm = null;JMenuItem jmi1, jmi2 = null;public static void main(String[] args) {// TODO Auto-generated method stubLogin ms = new Login();}// 构造函数public Login() {// 创建组件jb1 = new JButton("登录");jb2 = new JButton("重置");jb3 = new JButton("退出");// 设置监听jb1.addActionListener(this);jb2.addActionListener(this);jb3.addActionListener(this);jmb = new JMenuBar(); // JMenuBar指菜单栏jm = new JMenu("选项"); // JMenu是菜单栏中的选项栏jmi1 = new JMenuItem("开始"); // JMenuItem指选项栏中的选项jmi2 = new JMenuItem("退出系统");jm.add(jmi1);jm.add(jmi2);jmb.add(jm);jrb1 = new JRadioButton("教师", true);jrb2 = new JRadioButton("学生");bg = new ButtonGroup();bg.add(jrb1);bg.add(jrb2);
//      jrb2.setSelected(true);jp1 = new JPanel();jp2 = new JPanel();jp3 = new JPanel();jp4 = new JPanel();jlb1 = new JLabel("用户名：");jlb2 = new JLabel("密    码：");jlb3 = new JLabel("权    限：");jtf = new JTextField(10);jpf = new JPasswordField(10);// 加入到JPanel中jp1.add(jlb1);jp1.add(jtf);jp2.add(jlb2);jp2.add(jpf);jp3.add(jlb3);jp3.add(jrb1);jp3.add(jrb2);jp4.add(jb1);jp4.add(jb2);jp4.add(jb3);// 加入JFrame中this.setJMenuBar(jmb);this.add(jp1);this.add(jp2);this.add(jp3);this.add(jp4);// 设置布局管理器this.setLayout(new GridLayout(4, 1));// 给窗口设置标题this.setTitle("学生成绩管理系统");// 设置窗体大小this.setSize(300, 250);// 设置窗体初始位置this.setLocation(200, 150);// 设置当关闭窗口时，保证JVM也退出this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 显示窗体this.setVisible(true);this.setResizable(true);}@Overridepublic void actionPerformed(ActionEvent e) {if (e.getActionCommand() == "退出") {System.exit(0);} else if (e.getActionCommand() == "登录") {if (!jtf.getText().isEmpty() && !jpf.getText().isEmpty()) {// 当点击登录按钮时，首先与数据库建立连接GetSQL.ConnectSQL();// 如果选中教师登录 if (jrb1.isSelected()) {GetSQL.querytea("教师", jtf.getText());// 首先判断是否存在该用户，即是否得到了密码if (GetSQL.pwd == null) {this.clear();} else {// 调用登录方法this.tealogin();}} else if (jrb2.isSelected()) // 学生在登录系统{GetSQL.querystu("学生", jtf.getText());// 首先判断是否存在该用户，即是否得到了密码if (GetSQL.pwd == null) {this.clear();} else {// 调用登录方法this.stulogin();}}} else if (jtf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入用户名", "提示消息", JOptionPane.WARNING_MESSAGE);this.clear();} else if (jpf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入密码", "提示消息", JOptionPane.WARNING_MESSAGE);this.clear();}} else if (e.getActionCommand() == "重置") {this.clear();}}// 清空文本框和密码框public void clear() {jtf.setText("");jpf.setText("");}// 学生登录判断方法public void stulogin() {if (GetSQL.pwd.equals(jpf.getText())) {//                  System.out.println("登录成功");JOptionPane.showMessageDialog(null, "登录成功！", "提示消息", JOptionPane.WARNING_MESSAGE);this.clear();// 关闭当前界面dispose();// 创建一个新界面Stu_UI ui = new Stu_UI();} else if (jtf.getText().isEmpty() && jpf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入用户名和密码！", "提示消息", JOptionPane.WARNING_MESSAGE);} else if (jtf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入用户名！", "提示消息", JOptionPane.WARNING_MESSAGE);} else if (jpf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入密码！", "提示消息", JOptionPane.WARNING_MESSAGE);} else {JOptionPane.showMessageDialog(null, "用户名或者密码错误！\n请重新输入", "提示消息", JOptionPane.ERROR_MESSAGE);// 清空输入框this.clear();}}// 教师登录判断方法public void tealogin() {if (GetSQL.pwd.equals(jpf.getText())) {//                  System.out.println("登录成功");JOptionPane.showMessageDialog(null, "登录成功！", "提示消息", JOptionPane.WARNING_MESSAGE);this.clear();// 关闭当前界面dispose();// 创建一个新界面，适用于教师来管理学生Teacher t = new Teacher();} else if (jtf.getText().isEmpty() && jpf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入用户名和密码！", "提示消息", JOptionPane.WARNING_MESSAGE);} else if (jtf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入用户名！", "提示消息", JOptionPane.WARNING_MESSAGE);} else if (jpf.getText().isEmpty()) {JOptionPane.showMessageDialog(null, "请输入密码！", "提示消息", JOptionPane.WARNING_MESSAGE);} else {JOptionPane.showMessageDialog(null, "用户名或者密码错误！\n请重新输入", "提示消息", JOptionPane.ERROR_MESSAGE);// 清空输入框this.clear();}}}

 /** 功能：学生登录成功界面。* */
package shujuku;
import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;import javax.swing.*;public class Stu_UI extends JFrame implements ActionListener
{//定义组件JMenuBar jm= new JMenuBar();JMenu jm1 = new JMenu("查询");JMenuItem jmi1 = new JMenuItem("基本信息");JMenu jm2 = new JMenu("修改");JMenuItem jmi2 = new JMenuItem("修改密码");//        public static void main(String[] args) {//          // TODO Auto-generated method stub
//          Stu_UI  ui=new Stu_UI();
//      }   //构造函数public  Stu_UI()    //不能申明为void!!!!!否则弹不出新界面{//创建组件this.setTitle("学生管理系统");this.setLayout(new CardLayout());this.setJMenuBar(jm);jm.add(jm1);   jm.add(jm2);   jm1.add(jmi1);  jm2.add(jmi2);  jmi1.addActionListener(this);jmi2.addActionListener(this);this.setSize(400,300);this.setLocation(200, 200);      this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);
}@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubif(e.getSource()==jmi1){find();}if(e.getSource()==jmi2){change();}}public void find(){final JDialog fontDialog = new JDialog(this, "基本信息", false);Container con = fontDialog.getContentPane();JPanel panel1 = new JPanel();panel1.setLayout(new GridLayout(5,2));JPanel panel2 = new JPanel();JLabel J1 = new JLabel("请输入学号：");final JTextField JT1 = new JTextField(15);JLabel math = new JLabel("数学:");final JTextField math1 = new JTextField(15);JLabel chinese = new JLabel("语文:");final JTextField chinese1 = new JTextField(15);JLabel eng = new JLabel("英语:");final JTextField eng1 = new JTextField(15);JLabel zhengzhi = new JLabel("政治:");final JTextField zhengzhi1 = new JTextField(15);JButton JB1 = new JButton("查询");panel1.add(J1);panel1.add(JT1);panel1.add(math);panel1.add(math1);panel1.add(chinese);panel1.add(chinese1);panel1.add(eng);panel1.add(eng1);panel1.add(zhengzhi);panel1.add(zhengzhi1);panel2.add(JB1);con.add(panel1);con.add(panel2);con.setLayout(new GridLayout(2,1));fontDialog.setSize(400, 400);fontDialog.setLocation(200, 200);fontDialog.setResizable(true);fontDialog.setVisible(true);JB1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try{Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");}catch (ClassNotFoundException ce){}try{Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager","sa","123456");Statement stm = con.createStatement();ResultSet rs = stm.executeQuery("select * from info where 学号= '" + JT1.getText()+ "'");if(rs.next()){math1.setText(rs.getString("数学"));chinese1.setText(rs.getString("语文"));eng1.setText(rs.getString("英语"));zhengzhi1.setText(rs.getString("政治"));}else {JOptionPane.showMessageDialog(null,"不存在该记录！");}}catch (SQLException se){JOptionPane.showMessageDialog(null,se.getMessage()); }}});}public void change(){final JDialog fontDialog = new JDialog(this, "修改个人密码", false);Container con = fontDialog.getContentPane();JPanel panel1 = new JPanel();panel1.setLayout(new GridLayout(4,2));JPanel panel2 = new JPanel();JLabel JLP = new JLabel("请输入你的学号:");final JTextField JTL = new JTextField();JLabel JLP1 = new JLabel("请输入原来密 码 : ");JPasswordField JTP1 = new JPasswordField();JLabel JLP2 = new JLabel("请输入新密 码 : ");JPasswordField JTP2 = new JPasswordField();JLabel JLP3 = new JLabel("请再次输入新密 码   : ");final JPasswordField JTP3 = new JPasswordField();JButton JB1 = new JButton("确定");JButton JB2 = new JButton("退出");panel1.add(JLP);panel1.add(JTL);panel1.add(JLP1);panel1.add(JTP1);panel1.add(JLP2);panel1.add(JTP2);panel1.add(JLP3);panel1.add(JTP3);panel2.add(JB1);panel2.add(JB2);con.setLayout(new GridLayout(2,1));con.add(panel1);con.add(panel2);fontDialog.setSize(400, 340);fontDialog.setLocation(200, 200);fontDialog.setResizable(false);fontDialog.setVisible(true);JB1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try{ JTL.setEditable(false);Connection cot = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager","sa","123456");Statement stmt = cot.createStatement();int a =   stmt.executeUpdate("Update info set 密码='"+JTP3.getText()+"'where 学号='"+JTL.getText()+"'");//System.out.print("成功了"); if(a==1){JOptionPane.showMessageDialog(null,"修改成功");}else{JOptionPane.showMessageDialog(null,"修改失败");}}catch(SQLException se){System.out.print("数据连接或修改失败"); }}});   }}


/** 功能：实现了查询修改删除学生的信息。*/
package shujuku;import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;public class Teacher extends JFrame implements ActionListener {// 定义组件JMenuBar mainMenu = new JMenuBar();JMenu menu1 = new JMenu("学生信息操作");JMenuItem itemAdd = new JMenuItem("添加学生信息");JMenuItem itemDel = new JMenuItem("删除学生信息");JMenuItem itemMod = new JMenuItem("修改学生信息");JMenu itemSel = new JMenu("查看学生信息");JMenuItem item1 = new JMenuItem("查看全部学生");JMenuItem item2 = new JMenuItem("查看指定学生");JPanel jp = new JPanel();// 构造函数public Teacher() {// 创建组件super("学生管理系统-老师界面");mainMenu.add(menu1);mainMenu.add(itemSel);menu1.add(itemAdd);menu1.add(itemDel);menu1.add(itemMod);//menu1.add(itemSel);itemSel.add(item1);itemSel.add(item2);itemAdd.addActionListener(this);itemDel.addActionListener(this);itemMod.addActionListener(this);itemSel.addActionListener(this);item1.addActionListener(this);item2.addActionListener(this);this.setSize(320, 240);this.setResizable(false);this.setVisible(true);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setJMenuBar(mainMenu);this.add(jp);this.setLayout(null);this.setTitle("学生成绩管理系统—教师");this.setSize(500, 500);this.setLocation(150, 150);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);this.setResizable(true);}public void Add() {final JDialog fontDialog = new JDialog(this, "添加学生信息", false);Container con = fontDialog.getContentPane();JPanel panel1 = new JPanel();panel1.setLayout(new GridLayout(4, 2));JPanel panel2 = new JPanel();JLabel JLNumber = new JLabel("学号:");final JTextField JTNumber = new JTextField(15);JLabel JLName = new JLabel("姓名:");final JTextField JTName = new JTextField(15);JLabel JLusername = new JLabel("用户名:");final JTextField JTuname = new JTextField(15);JLabel JLpassword = new JLabel("密码:");final JTextField JTpassword = new JTextField(15);JButton JBAdd = new JButton("添加");JButton JBNext = new JButton("重置");panel1.add(JLNumber);panel1.add(JTNumber);panel1.add(JLName);panel1.add(JTName);panel1.add(JLusername);panel1.add(JTuname);panel1.add(JLpassword);panel1.add(JTpassword);panel2.add(JBAdd);panel2.add(JBNext);con.setLayout(new GridLayout(2, 1));con.add(panel1);con.add(panel2);fontDialog.setSize(400, 340);fontDialog.setLocation(200, 200);fontDialog.setResizable(true);fontDialog.setVisible(true);JBAdd.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");} catch (ClassNotFoundException ce) {JOptionPane.showMessageDialog(null, ce.getMessage());}try {Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");Statement stm = con.createStatement();int a = stm.executeUpdate("insert into info(权限,用户名,密码,学号,姓名) "+" values ('学生'"+",'"+JTuname.getText()+"','"+JTpassword.getText()+"','"+JTNumber.getText()+"','"+JTName.getText()+"')");if (a == 1) {JOptionPane.showMessageDialog(null, "添加成功!");} else {JOptionPane.showMessageDialog(null, "添加失败!");}stm.close();} catch (Exception ee) {JOptionPane.showMessageDialog(null, ee.getMessage());}}});JBNext.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {JTNumber.setText("");JTName.setText("");JTuname.setText("");JTpassword.setText("");}});}public void Select() {final JDialog fontDialog = new JDialog(this, "学生信息", false);Container con = fontDialog.getContentPane();JPanel panel1 = new JPanel();panel1.setLayout(new GridLayout(6, 2));JPanel panel2 = new JPanel();JLabel J1 = new JLabel("请输入学号：");final JTextField JT1 = new JTextField("");JLabel Jname = new JLabel("姓名：");final JTextField JTname = new JTextField("");JLabel JLmath = new JLabel("数学:");final JTextField JTmath = new JTextField();JLabel JLchinese = new JLabel("语文:");final JTextField JTchinese = new JTextField();JLabel JLeng = new JLabel("英语:");final JTextField JTeng = new JTextField(15);JLabel JLzhengzhi = new JLabel("政治:");final JTextField JTzhengzhi = new JTextField(15);JButton JB1 = new JButton("查询");JButton JB2 = new JButton("重置");JButton JB3 = new JButton("删除");JButton JB4 = new JButton("修改");panel1.add(J1);panel1.add(JT1);panel1.add(Jname);panel1.add(JTname);panel1.add(JLmath);panel1.add(JTmath);panel1.add(JLchinese);panel1.add(JTchinese);panel1.add(JLeng);panel1.add(JTeng);panel1.add(JLzhengzhi);panel1.add(JTzhengzhi);panel2.add(JB1);panel2.add(JB2);panel2.add(JB3);panel2.add(JB4);con.setLayout(new GridLayout(2, 1));con.add(panel1);con.add(panel2);fontDialog.setSize(400, 340);fontDialog.setLocation(200, 200);fontDialog.setResizable(true);fontDialog.setVisible(true);JB1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");} catch (ClassNotFoundException ce) {}try {Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");Statement stm = con.createStatement();ResultSet rs = stm.executeQuery("select * from info where 学号=  '" + JT1.getText() + "'");if (rs.next()) {JTname.setText(rs.getString("姓名"));JTmath.setText(rs.getString("数学"));JTchinese.setText(rs.getString("语文"));JTeng.setText(rs.getString("英语"));JTzhengzhi.setText(rs.getString("政治"));} else {JOptionPane.showMessageDialog(null, "不存在该记录！");}} catch (SQLException se) {JOptionPane.showMessageDialog(null, se.getMessage());}}});JB2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {JT1.setText(null);JTmath.setText("");JTchinese.setText("");JTeng.setText("");JTzhengzhi.setText("");JT1.requestFocus();}});JB3.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");Statement stmt = con.createStatement();int a = stmt.executeUpdate("delete from info where 学号='" + JT1.getText() + "' ");if (a == 1) {JOptionPane.showMessageDialog(null, "删除成功！");} else {JOptionPane.showMessageDialog(null, "删除失败！");}JTmath.setText("");JTchinese.setText("");JTeng.setText("");JTzhengzhi.setText("");con.close();} catch (SQLException ee) {}}});JB4.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");Statement stmt = con.createStatement();int a =    stmt.executeUpdate("Update info set 数学='"+JTmath.getText()+"'," +"语文='"+JTchinese.getText()+"',"+"英语='"+JTeng.getText()+"',"+"政治="+JTzhengzhi.getText()+"where 学号='"+JT1.getText()+"'");stmt = con.createStatement();//System.out.println("chenggong");if (a == 1) {JOptionPane.showMessageDialog(null, "修改成功");} else {JOptionPane.showMessageDialog(null, "修改失败");}JTmath.setText("");JTchinese.setText("");JTeng.setText("");JTzhengzhi.setText("");con.close();} catch (SQLException se) {}}});}@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubif (e.getSource() == itemAdd) {Add();} else if (e.getSource() == item1) {new allstudent();} else {Select();}}public static void main(String[] args) {//       TODO Auto-generated method stubnew Teacher();}
}

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