Complete Users and UserDao

src/main/java/dev/dao/UserDao.java

@@ -1,21 +1,71 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 public class UserDao {
 
     public boolean save(User user) {
 
-        // TODO:
-        // Insert user into database
+        String sql = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)";
+
+        try (
+                Connection connection = DatabaseConnection.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)
+        ) {
+
+            statement.setString(1, user.getUsername());
+            statement.setString(2, user.getPassword());
+            statement.setString(3, user.getEmail());
+
+            int rows = statement.executeUpdate();
+
+            return rows > 0;
+
+        } catch (SQLException e) {
+
+            System.out.println("Error saving user: " + e.getMessage());
+            return false;
+
+        }
 
-        return false;
     }
 
     public User findByUsername(String username) {
 
-        // TODO:
-        // Find a user by username
+        String sql = "SELECT id, username, password, email FROM users WHERE username = ?";
+
+        try (
+                Connection connection = DatabaseConnection.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)
+        ) {
+
+            statement.setString(1, username);
+
+            ResultSet resultSet = statement.executeQuery();
+
+            if (resultSet.next()) {
+
+                User user = new User();
+
+                user.setId(resultSet.getInt("id"));
+                user.setUsername(resultSet.getString("username"));
+                user.setPassword(resultSet.getString("password"));
+                user.setEmail(resultSet.getString("email"));
+
+                return user;
+            }
+
+        } catch (SQLException e) {
+
+            System.out.println("Error finding user: " + e.getMessage());
+
+        }
 
         return null;
     }