建立對應的service

JpaService.java

package cn.wuyang.springboot.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import cn.wuyang.springboot
 
.dao.JpaDao;
import cn.wuyang.springboot.entity.Jpa;

@Service
public class JpaService {

    @Autowired
    private JpaDao jpaDao;

    //開啟事務
    @Transactional
    public List<Jpa> jpaList(){
        return jpaDao.findAll();
    }
}