事物管理

除了查詢，都要加事務；

可防止有的數據庫操作成功，有的不成功；

//controller

  @Autowired
  private GirlService girlService;
  @PostMapping(value = "/girls/two")
  public void girlTwo(){
      girlService.insertTwo();
  }

//service

package com.imooc;

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

@Service
public class GirlService {

    @Autowired
    private GirlRepository girlRepository;

    @Transactional //事務處理的關鍵！！！
    public void insertTwo(){
        Girl girlA = new Girl();
        girlA.setAge(12);
        girlA.setCupSize("F");
        girlRepository.save(girlA);


        Girl girlB = new Girl();
        girlB.setAge(18);
        girlB.setCupSize("yy");
        girlRepository.save(girlB);

    }

}

//Repository