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Java_Practice2/src/ex_241023_cha15/homework/Kjh0313_DAO.java

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+package ex_241023_cha15.homework;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Kjh0313_DAO {
+	String driver = "oracle.jdbc.driver.OracleDriver";
+	String url = "jdbc:oracle:thin:@localhost:1521:xe";
+	String userid = "scott";
+	String passwd = "tiger";
+
+	public Kjh0313_DAO() {
+		try {
+			Class.forName(driver);
+		} catch (ClassNotFoundException e) {
+			e.printStackTrace();
+		}
+	}
+
+	// 조회
+	public List<Kjh0313_DTO> selectMember() {
+		List<Kjh0313_DTO> list = new ArrayList<Kjh0313_DTO>();
+		Connection con = null;
+		PreparedStatement pstmt = null;
+		ResultSet rs = null;
+
+		try {
+			con = DriverManager.getConnection(url, userid, passwd);
+			String query = "SELECT name,email,password FROM MEMBER501 ORDER BY id ASC";
+			pstmt = con.prepareStatement(query);
+			rs = pstmt.executeQuery();
+
+			while (rs.next()) {
+				Kjh0313_DTO dto = new Kjh0313_DTO();
+				dto.setName(rs.getString("name"));
+				dto.setEmail(rs.getString("email"));
+				dto.setPassword(rs.getString("password"));
+				list.add(dto);
+			}
+
+		} catch (Exception e) {
+			e.printStackTrace();
+
+		} finally {
+			try {
+				if (rs != null) rs.close();
+				if (pstmt != null) pstmt.close();
+				if (con != null) con.close();
+			} catch (SQLException e) {
+				e.printStackTrace();
+			}
+		}
+		return list;
+	}
+
+	// 저장
+	public int insertMember(String name, String email, String password) {
+		Connection con = null;
+		PreparedStatement pstmt = null;
+		int result = 0;
+
+		try {
+			con = DriverManager.getConnection(url, userid, passwd);
+			String sql = "INSERT INTO MEMBER501(id,name,email,password) VALUES(?,?,?,?)";
+			pstmt = con.prepareStatement(sql);
+
+			System.out.println(name);
+
+			pstmt.setInt(1, getMaxId());
+			pstmt.setString(2, name);
+			pstmt.setString(3, email);
+			pstmt.setString(4, password);
+			result = pstmt.executeUpdate();
+
+			System.out.println(result + "개의 레코드가 저장");
+
+		} catch (Exception e) {
+			e.printStackTrace();
+
+		} finally {
+			try {
+				if (pstmt != null) pstmt.close();
+				if (con != null) con.close();
+			} catch (SQLException e) {
+				e.printStackTrace();
+			}
+		}
+		return result;
+	}
+
+	// id 생성
+	private int getMaxId() {
+		Connection con = null;
+		PreparedStatement pstmt = null;
+		ResultSet rs = null;
+		int maxId = 1;
+
+		try {
+			con = DriverManager.getConnection(url, userid, passwd);
+			String query = "SELECT * FROM (SELECT id FROM MEMBER501 ORDER BY id DESC) WHERE ROWNUM = 1";
+			pstmt = con.prepareStatement(query);
+			rs = pstmt.executeQuery();
+
+			if(rs.next()) {
+				maxId = rs.getInt("id") + 1;
+			}
+
+		} catch (Exception e) {
+			e.printStackTrace();
+
+		} finally {
+			try {
+				if (rs != null) rs.close();
+				if (pstmt != null) pstmt.close();
+				if (con != null) con.close();
+			} catch (SQLException e) {
+				e.printStackTrace();
+			}
+		}
+		return maxId;
+	}
+}

Java_Practice2/src/ex_241023_cha15/homework/Kjh0313_DTO.java

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+package ex_241023_cha15.homework;
+
+public class Kjh0313_DTO {
+	private Integer id;
+	private String name;
+	private String email;
+	private String password;
+
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getEmail() {
+		return email;
+	}
+
+	public void setEmail(String email) {
+		this.email = email;
+	}
+
+	public String getPassword() {
+		return password;
+	}
+
+	public void setPassword(String password) {
+		this.password = password;
+	}
+
+}

Java_Practice2/src/ex_241023_cha15/homework/Kjh0313_Db.java

@@ -0,0 +1,103 @@
+package ex_241023_cha15.homework;
+
+import java.awt.BorderLayout;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.swing.*;
+
+public class Kjh0313_Db extends JFrame {
+	private JTextField nameField;
+	private JTextField emailField;
+	private JTextField pwField;
+	private JPanel showPanel;
+
+	private List<Kjh0313_DTO> members;
+
+	private Kjh0313_DAO memberDAO = new Kjh0313_DAO();
+
+	public Kjh0313_Db() {
+		setTitle("회원 관리 프로그램");
+		setSize(800, 300);
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		members = new ArrayList<Kjh0313_DTO>();
+
+		JPanel inputPanel = new JPanel();
+		setLayout(new BorderLayout());
+
+		// 입력창
+		inputPanel.add(new JLabel("이름: "));
+		nameField = new JTextField(10);
+		inputPanel.add(nameField);
+		inputPanel.add(new JLabel("이메일: "));
+		emailField = new JTextField(20);
+		inputPanel.add(emailField);
+		inputPanel.add(new JLabel("비밀번호: "));
+		pwField = new JTextField(10);
+		inputPanel.add(pwField);
+
+		// 버튼
+		JButton addButton = new JButton("가입");
+		inputPanel.add(addButton);
+		JButton selButton = new JButton("조회");
+		inputPanel.add(selButton);
+
+		showPanel = new JPanel();
+		showPanel.setLayout(new BoxLayout(showPanel, BoxLayout.Y_AXIS));
+
+		add(inputPanel,BorderLayout.NORTH);
+		add(showPanel,BorderLayout.CENTER);
+
+		addButton.addActionListener(e -> addMember());
+		selButton.addActionListener(e -> selMember());
+
+		setVisible(true);
+	}
+
+	// 가입
+	public void addMember() {
+		String name = nameField.getText();
+		String email = emailField.getText();
+		String password = pwField.getText();
+
+		if(name.isEmpty() || email.isEmpty() || password.isEmpty()) {
+			JOptionPane.showMessageDialog(null, "이름, 이메일, 비밀번호를 모두 입력해주세요.",
+					"입력 오류", JOptionPane.ERROR_MESSAGE);
+			return;
+		}
+
+		if(memberDAO.insertMember(name, email, password) > 0) {
+			JOptionPane.showMessageDialog(null, "회원가입이 완료되었습니다.",
+					"가입 성공", JOptionPane.INFORMATION_MESSAGE);
+		} else {
+			JOptionPane.showMessageDialog(null, "회원가입에 실패했습니다.",
+					"저장 오류", JOptionPane.ERROR_MESSAGE);
+		}
+
+		showPanel.removeAll(); // 회원목록 초기화
+		showPanel.revalidate();
+		showPanel.repaint();
+	}
+
+	// 조회
+	public void selMember() {
+		showPanel.removeAll(); // 회원목록 초기화
+		members = memberDAO.selectMember();
+
+		for (Kjh0313_DTO member : members) {
+			JLabel memberLabel = new JLabel("이름 : " + member.getName() + ", 이메일 : " + member.getEmail());
+			showPanel.add(memberLabel);
+		}
+
+		showPanel.revalidate();
+		showPanel.repaint();
+	}
+
+
+
+	public static void main(String[] args) {
+		new Kjh0313_Db();
+	}
+
+}