Hibernate刪除行和外鍵行ManyToOne

Question

我有以下兩個類，一個ReqCandAssociation可以具有許多注釋，並且它的映射方式如下。 我需要找出一種方法，當我刪除ReqCandAssociation時，它會刪除所有與其相關的注釋。 謝謝

@Entity
@Table(name = "candidate_jobReq")
public class ReqCandAssociation implements Serializable {

@Id
private Integer candidateId;

@Id
private Integer jobId;

@Column(name = "reqStatus")
private String reqStatus;

@ManyToOne
@PrimaryKeyJoinColumn(name="candidateId", referencedColumnName="id")
private Candidate candidate;

@ManyToOne
@PrimaryKeyJoinColumn(name="jobId", referencedColumnName="id")
private JobReq jobReq;

public ReqCandAssociation(){

}

二等

@Entity
@Table(name="comment")

 public class Comment {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Integer id; 

@Column(name="commentText")
private String commentText;

@Column(name="commentDate")
private Date commentDate;

@ManyToOne
@PrimaryKeyJoinColumn(name="reqCandAssociationId", referencedColumnName="id")
private ReqCandAssociation reqCandAssociation;

@ManyToOne
@PrimaryKeyJoinColumn(name="userId", referencedColumnName="id")
private User user;

Answer 1

將其更改為以下內容，我將其進行雙向映射。

@Entity
@Table(name = "candidate_jobReq")
public class ReqCandAssociation implements Serializable {

@Id
private Integer candidateId;

@Id
private Integer jobId;

@Column(name = "reqStatus")
private String reqStatus;

@OneToMany(cascade = { CascadeType.ALL }) //this is added here.
@JoinColumn(name ="reqCandAssociationId")
private Set<Comment> comments;
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閱讀有關級聯選項的更多信息。 所有級聯類型均為all | none |保存更新| delete | alldelete-orphan | delete-orphan

級聯全部將刪除與此類關聯的所有注釋。