added LoginPage.java

LoginPage.java

@@ -0,0 +1,80 @@
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.sql.*;
+
+public class LoginPage extends JDialog implements jdbcValues{
+    private JFormattedTextField ftfUserId;
+    private JPasswordField pfPassword;
+    private JButton loginButton;
+    private JButton cancelButton;
+    private JPanel loginPanel;
+
+    public Guest guest;
+
+    public LoginPage(JFrame parent){
+        super(parent);
+        setTitle("Login");
+        setContentPane(loginPanel);
+        setMinimumSize(new Dimension(450,474));
+        setModal(true);
+        setLocationRelativeTo(parent);
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+        loginButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try{
+                    long id = Long.parseLong(ftfUserId.getText());
+                    String password = String.valueOf(pfPassword.getPassword());
+
+                    guest = getAuthenticatedGuest(id, password);
+
+                    if(guest != null) dispose();
+                    else throw new Exception();
+
+                } catch (Exception i) {JOptionPane.showMessageDialog(LoginPage.this, "User ID and/or Password is INVALID", "Try Again", JOptionPane.ERROR_MESSAGE);}
+            }
+        });
+        cancelButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                dispose();
+            }
+        });
+        setVisible(true);
+    }
+
+
+
+    private Guest getAuthenticatedGuest(long id, String password){
+        Guest guest = null;
+        try{
+            Connection conn = DriverManager.getConnection(DB_URL,DB_USERNAME,DB_PASSWORD);
+            Statement stmt = conn.createStatement();
+            String query = "SELECT * FROM employees WHERE user_id=? AND password=?";
+            PreparedStatement preparedStatement = conn.prepareStatement(query);
+            preparedStatement.setLong(1, id);
+            preparedStatement.setString(2, password);
+            ResultSet resultSet = preparedStatement.executeQuery();
+
+            if(resultSet.next()) {
+                guest = new Guest();
+                guest.id_number = resultSet.getLong("user_id");
+                guest.password = resultSet.getString("password");
+                guest.first_name = resultSet.getString("first_name");
+                guest.last_name = resultSet.getString("last_name");
+                guest.setEnum(resultSet.getString("status"));
+            }
+            preparedStatement.close();
+            stmt.close();
+            conn.close();
+        }catch (Exception e){
+            e.printStackTrace();
+        }
+
+        return guest;
+    }
+}
+
+