java - Cascade.ALL 有效，但 CascadeType.PERSIST 不用于保存新实体

Question

我有以下实体：

Channel

@ManyToOne(cascade = { CascadeType.ALL })
@JoinColumn(name = "campaign_business_id")
private CampaignBusiness campaignBusiness;

@ManyToOne(cascade = { CascadeType.ALL })
@JoinColumn(name = "campaign_id")
private Campaign campaign;


Campaign

@ManyToOne(cascade = { CascadeType.ALL })
@JoinColumn(name = "event_id")
private Event event;

CampaignBusiness 
@ManyToOne
@JoinColumn(name = "campaign_id")
private Campaign campaign;

我只想使用Cascade.PERSIST - 因为我希望在 casacde 时更新记录而不是删除。

但是，当我写而不是Cascade.ALL时，Cascade.PERSIST并使用以下代码：

Event event = new Event();
Campaign campaign = new Campaign();
campaign.setEvent(event);
CampaignBusiness campaignBusiness = new CampaignBusiness();
campaignBusiness.setCampaign(campaign);
Channel channel = new Channel();
channel.setCampaign(campaign);
channel.setCampaignBusiness(campaignBusiness);
channelDAO.save(channel);

我得到一个例外

org.hibernate.TransientObjectException：对象引用了一个未保存的瞬态实例 - 在刷新之前保存瞬态实例：