// 项目目标：建立员工管理系统第一个版本。

// 实现图形用户界面的员工信息查询、增、删、改；与数据库建立，并将修改结果时时保存到数据库。

// 模块：1.GUI界面 2.数据库连接 3.查询 4.增、5删 6改(操作数据库）import java.sql.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class EmpManageSys implements ActionListener {Connection con;Statement stmt;String sql;ResultSet rs;StringBuffer sb = new StringBuffer();JTextField jtf2 = new JTextField("张飞",10);JTextField jtf3 = new JTextField(10);JTextField jtf4 = new JTextField(10);JTextField jtf7 = new JTextField(10);JTextField jtf5 = new JTextField(10);JTextField jtf6 = new JTextField(10);JTextField jtf8 = new JTextField(10);JTextField jtf9 = new JTextField(10);JTextArea jta10 = new JTextArea(50, 40);public void actionPerformed(ActionEvent e) {String str = e.getActionCommand();if ("查询".equals(str)) {//if check the button of 查询，then go to method of searchEmp() searchEmp();} else if ("增加".equals(str)) {//if check the button of 增加，then go to method of addEmp()addEmp();} else if ("修改".equals(str)) {//if check the button of 修改，then go to method of alterEmp() alterEmp();} else if ("撤除".equals(str)) {//if check the button of 撤除，then go to method of deleteEmp() deleteEmp();}}//this is the constructor.EmpManageSys() {createGUI();connectToDataBase();// searchEmp();// addEmp();// deleteEmp();alterEmp();}//connect to the database by using the method getConnection from the class of JdbcUtil.//You can find the class of JdbcUtil at the button of this page.public Connection connectToDataBase() {con = JdbcUtil.getConnection();System.out.println(con);return con;}public void searchEmp() {jta10.setText("");try {stmt = con.createStatement();// sql = "select * from Mstar where id=" + jtf3.getText();// sql1="select * from sd100343 where ="+jtf3.getText();sql = "select * from Mstar where chineseName="+ jtf2.getText().toLowerCase().trim() + "or id="+ jtf3.getText().toLowerCase().trim() + "or engName="+ jtf4.getText().toLowerCase().trim() + "or UNIT="+ jtf5.getText().toLowerCase().trim() + "or TEAM="+ jtf6.getText().toLowerCase().trim() + "or Phone="+ jtf7.getText().toLowerCase().trim() + "or region="+ jtf8.getText().toLowerCase().trim() + "or busStation="+ jtf9.getText().toLowerCase().trim();stmt.executeQuery(sql);rs = stmt.getResultSet();ResultSetMetaData meta = rs.getMetaData();int cols = meta.getColumnCount();while (rs.next()) {for (int i = 1; i <= cols; i++) {sb.append(" " + meta.getColumnName(i) + " =");sb.append(rs.getString(i));}sb.append("\n");jta10.setText(sb.toString());}} catch (SQLException e11) {e11.printStackTrace();}}public void addEmp() {try {stmt = con.createStatement();sql = "update Mstar values(" + jtf2.getText() + jtf3.getText() + jtf4.getText() + jtf5.getText() + jtf6.getText()+ jtf7.getText() + jtf8.getText() + jtf9.getText() + ")";int i = stmt.getUpdateCount();if ((jtf2.getText() != null) && (jtf4.getText() != null)&& (jtf6.getText() != null) && (jtf7.getText() != null)) { stmt.executeUpdate(sql);jta10.setText("添加记录成功" + i + "条");} else {jta10.setText("带*号项为添加记录时不能为空");}} catch (SQLException e1) {e1.printStackTrace();}}public void deleteEmp() {searchEmp();try {stmt = con.createStatement();sql = "delete from Mstar where chineseName="+ jtf2.getText().toLowerCase().trim() + "or id="+ jtf3.getText().toLowerCase().trim() + "or engName="+ jtf4.getText().toLowerCase().trim() + "or UNIT="+ jtf5.getText().toLowerCase().trim() + "or TEAM="+ jtf6.getText().toLowerCase().trim() + "or Phone="+ jtf7.getText().toLowerCase().trim() + "or region="+ jtf8.getText().toLowerCase().trim() + "or busStation=" + jtf9.getText().toLowerCase().trim();stmt.executeUpdate(sql);int i = stmt.getUpdateCount();jta10.setText("撤除操作成功" + i + "条");} catch (SQLException e) {e.printStackTrace();}}public void alterEmp() {searchEmp();sql = "update Mstar set chineseName="+ jtf2.getText().toLowerCase().trim() + "and id="+ jtf3.getText().toLowerCase().trim() + "and engName="+ jtf4.getText().toLowerCase().trim() + "and UNIT="+ jtf5.getText().toLowerCase().trim() + "and TEAM="+ jtf6.getText().toLowerCase().trim() + "and Phone="+ jtf7.getText().toLowerCase().trim() + "and region="+ jtf8.getText().toLowerCase().trim() + "and busStation=" + jtf9.getText().toLowerCase().trim();int i = 0;try {stmt.executeUpdate(sql);i = stmt.getUpdateCount();} catch (SQLException e) {e.printStackTrace();}jta10.setText("修改操作成功" + i + "条");}public void createGUI() {JFrame jf = new JFrame("员工信息管理系统");jf.setLayout(new GridLayout(2, 1));// jf.setLayout(new GridLayout(10,2));JPanel jp00 = new JPanel(new GridLayout(5, 4));JPanel jp1 = new JPanel();JButton jb11 = new JButton("查询");jb11.addActionListener(this);JButton jb12 = new JButton("增加");jb12.addActionListener(this);jp1.add(jb11);jp1.add(jb12);jp00.add(jp1);JPanel jp11 = new JPanel();JButton jb111 = new JButton("修改");jb111.addActionListener(this);JButton jb112 = new JButton("撤除");jb112.addActionListener(this);jp11.add(jb111);jp11.add(jb112);jp00.add(jp11);JPanel jp2 = new JPanel();JLabel jl2 = new JLabel("中文名 * ");jp2.add(jl2);jp2.add(jtf2);jp00.add(jp2);JPanel jp3 = new JPanel();JLabel jl3 = new JLabel("工号 ");jp3.add(jl3);jp3.add(jtf3);jp00.add(jp3);JPanel jp4 = new JPanel();JLabel jl4 = new JLabel("EngName*");jp4.add(jl4);jp4.add(jtf4);jp00.add(jp4);JPanel jp5 = new JPanel();JLabel jl5 = new JLabel("UNIT ");jp5.add(jl5);jp5.add(jtf5);jp00.add(jp5);JPanel jp6 = new JPanel();JLabel jl6 = new JLabel("TEAM* ");jp6.add(jl6);jp6.add(jtf6);jp00.add(jp6);JPanel jp7 = new JPanel();JLabel jl7 = new JLabel("Phone* ");jp7.add(jl7);jp7.add(jtf7);jp00.add(jp7);JPanel jp8 = new JPanel();JLabel jl8 = new JLabel("区域 ");jp8.add(jl8);jp8.add(jtf8);jp00.add(jp8);JPanel jp9 = new JPanel();JLabel jl9 = new JLabel("公交站 ");jp9.add(jl9);jp9.add(jtf9);jp00.add(jp9);jf.add(jp00);JPanel jp01 = new JPanel();jta10.setText("--用户使用手册-- \n1、查询：选择一个字段，如 EngName 在文本框中输入相应内容，点击查询\n2、增加：在各个文本框中输入相应内容后，点击增加。