Implement user registration and login methods

src/main/java/dao/UserDAO.java

@@ -1,10 +1,52 @@
 package dao;
 
-
+import model.User;
+import java.sql.*;
 
 public class UserDAO {
 
-
+    public boolean registerUser(User user) {
+        String sql = "INSERT INTO users (name, email, password, role) VALUES (?, ?, ?, ?)";
+        try (Connection conn = DBConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+
+            stmt.setString(1, user.getName());
+            stmt.setString(2, user.getEmail());
+            stmt.setString(3, user.getPassword());
+            stmt.setString(4, user.getRole());
+            int rows = stmt.executeUpdate();
+            return rows > 0;
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+
+    public User loginUser(String email, String password) {
+        String sql = "SELECT * FROM users WHERE email = ? AND password = ?";
+        try (Connection conn = DBConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+
+            stmt.setString(1, email);
+            stmt.setString(2, password);
+            ResultSet rs = stmt.executeQuery();
+
+            if (rs.next()) {
+                User user = new User();
+                user.setId(rs.getInt("id"));
+                user.setName(rs.getString("name"));
+                user.setEmail(rs.getString("email"));
+                user.setPassword(rs.getString("password"));
+                user.setRole(rs.getString("role"));
+                return user;
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
 
     // New method to reset password