Hibernate删除行和外键行ManyToOne

Question

我有以下两个类，一个 ReqCandAssociation 可以有很多 Comments，它是这样映射的。我需要找出一种方法，当我删除 ReqCandAssociation 时，它会删除其所有关联的 cmets。谢谢

@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

把它改成下面这样，我正在做双向映射。

@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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阅读有关级联选项的更多信息。所有级联类型均为 all|none|save-update|delete|all-delete-orphan|delete-orphan

级联 all 将删除与该类关联的所有 cmets。