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moozi
5/20 컴보2B 자바 본문
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Member extends JFrame {
JTextArea ta;//목록
JTextField tfName; //이름
JTextField tfID; //학번
JTextField tfDepartment; //학과
JTextField tfAddress; //주소
Member(){
setTitle("학생관리");//타이틀
Container c=getContentPane();
c.setLayout(new FlowLayout(FlowLayout.LEFT));
c.setBackground(Color.ORANGE);
c.add(new JLabel("이름"));
tfName=new JTextField(20);
c.add(tfName);
c.add(new JLabel("학번"));
tfID=new JTextField(13);
c.add(tfID);
JButton btnSearch=new JButton("Search");
c.add(btnSearch);
btnSearch.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent arg0) {
try{
Class.forName("com.mysql.jdbc.Driver");//드라이버로드
String connStr="jdbc:mysql://localhost:8888/sampledb";
Connection conn=DriverManager.getConnection(connStr,"root","1234");
Statement stm=conn.createStatement();
ResultSet rs=stm.executeQuery("select * from student where id='"+tfID.getText()+"'");
ta.setText("");//목록 초기화
ta.append("학번\t");
ta.append("이름\t");
ta.append("학과\t");
ta.append("주소\n");
ta.append("===========================================\n");
if(rs.next()){
ta.append(rs.getString("id")+"\t");
ta.append(rs.getString("name")+"\t");
ta.append(rs.getString("dept")+"\t");
ta.append(rs.getString("address")+"\n");
tfName.setText(rs.getString("name"));
tfID.setText(rs.getString("id"));
tfDepartment.setText(rs.getString("dept"));
tfAddress.setText(rs.getString("address"));
}
rs.close();
stm.close();
conn.close();
}catch(Exception a){
a.printStackTrace();//에러메시지출력
}
}});
c.add(new JLabel("학과"));
tfDepartment=new JTextField(20);
c.add(tfDepartment);
c.add(new JLabel("주소"));
tfAddress=new JTextField(20);
c.add(tfAddress);
ta=new JTextArea(7,23);
c.add(new JScrollPane(ta));//스크롤구현
JButton btnOK=new JButton("Insert");
c.add(btnOK);
//버튼에 리스너추가
btnOK.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if(tfName.getText().equals("")){
JOptionPane.showMessageDialog(null, "이름을 입력하세요","알림",JOptionPane.ERROR_MESSAGE);
tfName.requestFocus();//포커스
return;//함수종료
}
if(tfDepartment.getText().equals("")){
JOptionPane.showMessageDialog(null, "학과를 입력하세요","알림",JOptionPane.ERROR_MESSAGE);
tfDepartment.requestFocus();//포커스
return;//함수종료
}
if(tfAddress.getText().equals("")){
JOptionPane.showMessageDialog(null, "주소를 입력하세요","알림",JOptionPane.ERROR_MESSAGE);
tfAddress.requestFocus();//포커스
return;//함수종료
}
try{
Class.forName("com.mysql.jdbc.Driver");//드라이버로드
String connStr="jdbc:mysql://localhost:8888/sampledb";
Connection conn=DriverManager.getConnection(connStr,"root","1234");
Statement stm=conn.createStatement();
String sql="insert into student(id,name,dept,address) "
+ " values('"+tfID.getText()+"','"+tfName.getText()+"','"+tfDepartment.getText()+"','"+tfAddress.getText()+"')";
stm.executeUpdate(sql);
ResultSet rs=stm.executeQuery("select * from student");
ta.setText("");//목록 초기화
ta.append("학번\t");
ta.append("이름\t");
ta.append("학과\t");
ta.append("주소\n");
ta.append("===========================================\n");
while(rs.next()){
ta.append(rs.getString("id")+"\t");
ta.append(rs.getString("name")+"\t");
ta.append(rs.getString("dept")+"\t");
ta.append(rs.getString("address")+"\n");
}
rs.close();
stm.close();
conn.close();
}catch(Exception a){
a.printStackTrace();//에러메시지출력
}
}});
JButton btnCancel=new JButton("List");
btnCancel.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
try{
Class.forName("com.mysql.jdbc.Driver");//드라이버로드
String connStr="jdbc:mysql://localhost:8888/sampledb";
Connection conn=DriverManager.getConnection(connStr,"root","1234");
Statement stm=conn.createStatement();
ResultSet rs=stm.executeQuery("select * from student");
ta.setText("");//목록 초기화
ta.append("학번\t");
ta.append("이름\t");
ta.append("학과\t");
ta.append("주소\n");
ta.append("===========================================\n");
while(rs.next()){
ta.append(rs.getString("id")+"\t");
ta.append(rs.getString("name")+"\t");
ta.append(rs.getString("dept")+"\t");
ta.append(rs.getString("address")+"\n");
}
rs.close();
stm.close();
conn.close();
}catch(Exception a){
a.printStackTrace();//에러메시지출력
}
}});
c.add(btnCancel);
JButton btnInsert=new JButton("Update");
c.add(btnInsert);
btnInsert.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if(tfName.getText().equals("")){
JOptionPane.showMessageDialog(null, "이름을 입력하세요","알림",JOptionPane.ERROR_MESSAGE);
tfName.requestFocus();//포커스
return;//함수종료
}
if(tfDepartment.getText().equals("")){
JOptionPane.showMessageDialog(null, "학과를 입력하세요","알림",JOptionPane.ERROR_MESSAGE);
tfDepartment.requestFocus();//포커스
return;//함수종료
}
if(tfAddress.getText().equals("")){
JOptionPane.showMessageDialog(null, "주소를 입력하세요","알림",JOptionPane.ERROR_MESSAGE);
tfAddress.requestFocus();//포커스
return;//함수종료
}
try{
Class.forName("com.mysql.jdbc.Driver");//드라이버로드
String connStr="jdbc:mysql://localhost:8888/sampledb";
Connection conn=DriverManager.getConnection(connStr,"root","1234");
Statement stm=conn.createStatement();
String sql="update student set name='"+tfName.getText()+"', dept='"+tfDepartment.getText()+"', address='"+tfAddress.getText()
+"' where id='"+tfID.getText()+"'";
stm.executeUpdate(sql);
ResultSet rs=stm.executeQuery("select * from student");
ta.setText("");//목록 초기화
ta.append("학번\t");
ta.append("이름\t");
ta.append("학과\t");
ta.append("주소\n");
ta.append("===========================================\n");
while(rs.next()){
ta.append(rs.getString("id")+"\t");
ta.append(rs.getString("name")+"\t");
ta.append(rs.getString("dept")+"\t");
ta.append(rs.getString("address")+"\n");
}
rs.close();
stm.close();
conn.close();
}catch(Exception a){
a.printStackTrace();//에러메시지출력
}
}});
JButton btnDelete=new JButton("Delete");
c.add(btnDelete);
btnDelete.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
try{
Class.forName("com.mysql.jdbc.Driver");//드라이버로드
String connStr="jdbc:mysql://localhost:8888/sampledb";
Connection conn=DriverManager.getConnection(connStr,"root","1234");
Statement stm=conn.createStatement();
String sql="delete from student where id='"+tfID.getText()+"'";
stm.executeUpdate(sql);
ResultSet rs=stm.executeQuery("select * from student");
ta.setText("");//목록 초기화
ta.append("학번\t");
ta.append("이름\t");
ta.append("학과\t");
ta.append("주소\n");
ta.append("===========================================\n");
while(rs.next()){
ta.append(rs.getString("id")+"\t");
ta.append(rs.getString("name")+"\t");
ta.append(rs.getString("dept")+"\t");
ta.append(rs.getString("address")+"\n");
}
//입력필드 초기화
tfName.setText("");
tfID.setText("");
tfDepartment.setText("");
tfAddress.setText("");
rs.close();
stm.close();
conn.close();
}catch(Exception a){
a.printStackTrace();//에러메시지출력
}
}});
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//종료
//setResizable(false);//화면크기조정금지
setSize(305,335);//가로,세로 사이즈
setVisible(true);//보이게하기.
}
public static void main(String[] args) {
new Member();//생성자호출.인스턴스생성
}
}