Complete the project

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

@@ -1,23 +1,61 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import javax.xml.transform.Result;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 public class UserDao {
 
-    public boolean save(User user) {
+    public boolean save(User user)
+    {
+        String sql = "INSERT INTO users(username,password,email) VALUES(?,?,?)";
 
-        // TODO:
-        // Insert user into database
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(sql))
+        {
+            ps.setString(1, user.getUsername());
+            ps.setString(2, user.getPassword());
+            ps.setString(3, user.getEmail());
 
+            return ps.executeUpdate() > 0;
+        }
+        catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
         return false;
     }
 
-    public User findByUsername(String username) {
+    public User findByUsername(String username)
+    {
+        String sql = "SELECT * FROM users WHERE username=?";
 
-        // TODO:
-        // Find a user by username
+        try (Connection conn = DatabaseConnection.getConnection();
+            PreparedStatement ps = conn.prepareStatement(sql))
+        {
+            ps.setString(1, username);
+            ResultSet rs = ps.executeQuery();
 
+            if (rs.next())
+            {
+                User user = new User();
+                user.setId(rs.getInt("id"));
+                user.setUsername(rs.getString("username"));
+                user.setPassword(rs.getString("email"));
+                user.setPassword(rs.getString("password"));
+
+                return user;
+            }
+        }
+        catch (SQLException e)
+        {
+            throw new RuntimeException(e);
+        }
         return null;
     }
-
 }