如何在 JPA 中保留 List<List<Object>> 类型的属性？

Question

持久化具有 List 类型字段的实体的最聪明方法是什么？

@Entity

@Table(name = "Final_Feign_Client_Result") 公共类 FinalFCResultEntity {

@Id
@Column(name = "id")
@GeneratedValue(strategy = IDENTITY)
private Integer id;

@ElementCollection(targetClass = Object.class)
@CollectionTable(name = "Final_Feign_Client_Result_Columns")
@OnDelete(action = OnDeleteAction.CASCADE)
@JoinColumn(name = "final_feign_client_result_entity_id", nullable = false)
private Set<Object> values;

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public Set<Object> getValues() {
    return values;
}

public void setValues(Set<Object> values) {
    this.values = values;
}

} 我对列没有问题，但如果我尝试插入值，我会得到这个异常：

Caused by: org.hibernate.MappingException: Could not determine type for: java.util.List, at table: final_feign_client_result_columns, for columns: [org.hibernate.mapping.Column(values)]

我该如何解决这个问题？

Answer 1

你好guidop21，请添加

@ElementCollection(targetClass = Object.class)
@CollectionTable(name = "Final_Feign_Client_Result_Columns")
@OnDelete(action = OnDeleteAction.CASCADE)
@JoinColumn(name = "final_feign_client_result_entity_id", nullable = false)
@OneToMany
private List<List<<Object>> values;