如何修复 Hibernate 的“对象引用未保存的瞬态实例 - 在刷新之前保存瞬态实例"错误 [英] How to fix the Hibernate "object references an unsaved transient instance - save the transient instance before flushing" error

问题描述

当我使用 Hibernate 保存对象时收到以下错误

I receive following error when I save the object using Hibernate

object references an unsaved transient instance - save the transient instance before flushing

推荐答案

我相信这可能只是重复答案，但只是为了澄清，我在 @OneToOne 映射以及一个@OneToMany.在这两种情况下，事实是我添加到 Parent 的 Child 对象尚未保存在数据库中.因此，当我将 Child 添加到 Parent，然后保存 Parent 时，Hibernate 会抛出 " 对象引用未保存的瞬态实例- 在刷新之前保存瞬态实例" 保存父级时的消息.

I believe this might be just repeat answer, but just to clarify, I got this on a @OneToOne mapping as well as a @OneToMany. In both cases, it was the fact that the Child object I was adding to the Parent wasn't saved in the database yet. So when I added the Child to the Parent, then saved the Parent, Hibernate would toss the "object references an unsaved transient instance - save the transient instance before flushing" message when saving the Parent.

在 Parent's 引用上添加 cascade = {CascadeType.ALL} 到 Child 解决了这两种情况下的问题.这保存了 Child 和 Parent.

Adding in the cascade = {CascadeType.ALL} on the Parent's reference to the Child solved the problem in both cases. This saved the Child and the Parent.

很抱歉重复回答，只是想为大家进一步澄清.

Sorry for any repeat answers, just wanted to further clarify for folks.

@OneToOne(cascade = {CascadeType.ALL})
@JoinColumn(name = "performancelog_id")
public PerformanceLog getPerformanceLog() {
    return performanceLog;
}

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