package com.example.springboot.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.example.springboot.entity.StorageCage; import com.example.springboot.mapper.SpianMapper; @Service public class SpianService { @Autowired private SpianMapper spianMapper; public void Save(StorageCage spian){ if(spian.getId()==null){ spianMapper.update(); }else{ spianMapper.update(); } } }