[스프링부트] 26. 스프링부트 뱅크 v1 회원가입

UserRequest

package com.metacoding.bankv1.user;

import lombok.Data;

public class UserRequest {

    @Data
    public static class JoinDTO {
        private String username;
        private String password;
        private String fullname;
    }

    @Data
    public static class loginDTO {
        private String username;
        private String password;
    }
}

UserRepository

package com.metacoding.bankv1.user;

import jakarta.persistence.EntityManager;
import jakarta.persistence.Query;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Repository;

@RequiredArgsConstructor
@Repository
public class UserRepository {
    private final EntityManager em;

    public User findByUsername(String username) { // 중복 검사
        Query query = em.createNativeQuery("select * from user_tb where username = ?", User.class);
        query.setParameter(1, username);
        try {
            return (User) query.getSingleResult();
        } catch (Exception e) {
            return null;
        }
    }

    public void save(String username, String password, String fullname) { // 없으면 추가
        Query query = em.createNativeQuery("insert into user_tb(username, password, fullname, created_at) values (?, ?, ?, now())");
        query.setParameter(1, username);
        query.setParameter(2, password);
        query.setParameter(3, fullname);
        query.executeUpdate();
    }
}

UserService

package com.metacoding.bankv1.user;

import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@RequiredArgsConstructor
@Service
public class UserService {
    private final UserRepository userRepository;

    @Transactional
    public void 회원가입(UserRequest.JoinDTO joinDTO) {
        // 1. username 중복 검사
        User user = userRepository.findByUsername(joinDTO.getUsername());

        // 2. 있으면 exception 터트리기, 오류는 리턴 하지말고 바로 터트려라
        if (user != null) throw new RuntimeException("동일한 username이 존재합니다.");

        // 3. 없으면 회원가입
        userRepository.save(joinDTO.getUsername(), joinDTO.getPassword(), joinDTO.getFullname());
    }
}