java员工信息系统的增删改查

java代码实现增删改查其实并不难，有很多方法
我这里就是举个例子，方法千千万，也不分好坏
写出来能运行的都是好方法!!!

首先：

import java.sql.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

然后，代码主体内容如下：

public class Genggai implements ActionListener{Connection con;Statement stmt;String sql;ResultSet rs;StringBuffer sb = new StringBuffer();JTextField jtf2 = new JTextField("Tom",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)) {searchEmp();} else if ("增加".equals(str)) {addEmp();} else if ("修改".equals(str)) {alterEmp();} else if ("撤除".equals(str)) {deleteEmp();}}Genggai() {createGUI();connectToDataBase();alterEmp();}public Connection connectToDataBase() {System.out.println(con);return con;}public void searchEmp() {jta10.setText("");try {stmt = con.createStatement();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() + jtf4.getText()  + ")";int i = stmt.getUpdateCount();if ((jtf2.getText() != null) && (jtf4.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("姓名 * ");jp2.add(jl2);jp2.add(jtf2);jp00.add(jp2);JPanel jp3 = new JPanel();JLabel jl3 = new JLabel("密码");jp3.add(jl3);jp3.add(jtf3);jp00.add(jp3);JPanel jp4 = new JPanel();JLabel jl4 = new JLabel("密码 *");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("确认密码* ");jp6.add(jl6);jp6.add(jtf6);jp00.add(jp6);JPanel jp7 = new JPanel();JLabel jl7 = new JLabel("手机号 * ");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("                                                        这是修改员工信息  ！");jp01.add(jta10);jf.add(jp01);jf.setSize(700, 500);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);jf.setVisible(true);}public static void main(String[] args) {new Genggai();}}

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