java - 我在@OneToMany hibernate 映射中遇到错误？

Question

我试图在两个类之间建立一对多连接，但我收到此错误 org.hibernate.AnnotationException: Illegal attempt to map a non collection as a @OneToMany。

这是我的代码，

Job.java

@OneToMany
@JoinColumn(name = "id", referencedColumnName = "id", insertable = false, updatable = false)

private Set<JobCostSplit> jobCostSplit;

JobCostSplit.java

@Column(name = "job_id")
private Long jobId;

@JsonIgnore
@OneToMany
@JoinColumn(name = "job_id", referencedColumnName = "id", insertable = false, updatable = false)
private Job job;

Answer 1

您使用 @OneToMany 注释您的 Job。意味着您将在 Job 上拥有一个属性，在 JobCostSplit 上拥有更多属性。

所以如果你想要一个Job和多个JobCostSplit，你必须这样设置:

@ManyToOne
@JoinColumn(name = "job_id", referencedColumnName = "id", insertable = false, updatable = false)
private Job job;