Spring Data JPA-按ID綁定對象

Question

這是我的代碼

@OneToMany(mappedBy = "parentTest")
@Cascade(CascadeType.ALL)
List<LanguageRecord> records = new ArrayList<>();

我想要這樣的東西

@OneToMany(mappedBy = "parentTest")
@Cascade(CascadeType.ALL)
List<Long> languageRecordsIds = new ArrayList<>();

如何通過ID而不是對象進行映射？

Answer 1

這個問題的公認答案回答了如何僅保留id引用。

為了明確您的特定問題該怎么做，您需要執行以下操作：

@ElementCollection
@CollectionTable(name = "LanguageRecordTable", joinColumns=(@JoinColumn(name="<Column name of field to select from in LanguageRecordTable>"))
@Column(name = "<Name of id field to join on in this table>")
List<Long> languageRecordsIds;