我在@OneToMany 休眠映射中遇到错误？

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

您必须将 JobCostSplit 中的字段注释为 @ManyToOne

 @ManyToOne
 private Job job

Answer 2

您用 @OneToMany 注释了您的 Job。意味着您将在 Job 上拥有一个属性，在 JobCostSplit 上拥有更多属性。

所以如果你想拥有一个 Job 和更多 JobCostSplit 你必须这样设置：

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

Answer 3

首先你需要写

@OneToMany(fetch = FetchType.LAZY, mappedBy = "job")
private Set<JobCostSplit> jobCostSplit= new HashSet<JobCostSplit>();

在Job.java中，然后添加

@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name="jobId",nullable=false)
private Job job;

在JobCostSplit.java

Answer 4

在job.java中将@OneToMany替换为@ManyToOne

我在@OneToMany 休眠映射中遇到错误？

I'm getting error in @OneToMany hibernate mapping?

java

annotations

hibernate

hibernate-mapping

spring-boot