package dev.dao; import dev.database.DatabaseConnection; import dev.model.User; import java.sql.*; public class UserDao { public boolean save(User user) { String sql = "INSERT INTO users(username,password,email) VALUES(?,?,?)"; try(Connection connection = DatabaseConnection.getConnection(); PreparedStatement ps = connection.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) { String sql = "SELECT * FROM users WHERE username=?"; try(Connection connection = DatabaseConnection.getConnection(); PreparedStatement ps = connection.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("password")); user.setEmail(rs.getString("email")); return user; } } catch (SQLException e) { e.printStackTrace(); } return null; } }