批量添加（两个表）

DishServiceImpl

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);//后绪步骤实现

        //获取insert语句生成的主键值
        Long dishId = dish.getId();
		//批量添加主键id
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
        }
    }
}

DishFlavorMapper

@Mapper
public interface DishFlavorMapper {
    /**
     * 批量插入口味数据
     * @param flavors
     */
    void insertBatch(List<DishFlavor> flavors);

}

DishFlavorMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sky.mapper.DishFlavorMapper">
    <insert id="insertBatch">
        insert into dish_flavor (dish_id, name, value) VALUES
        <foreach collection="flavors" item="df" separator=",">
            (#{df.dishId},#{df.name},#{df.value})
        </foreach>
    </insert>
</mapper>