使用 Hibernate 在 Postgresql 中持久化 EnumSet

Persisting EnumSet in Postgresql with Hibernate

Effective Java, Item 32, states Use EnumSet instead of bit fields. I also found this nice tutorial on the topic. This book has been around for a while, so why don't I find any posts on how to persist an EnumSet with Hibernate? Well, I actually found this one, and another one,但它们都很旧,指向相同且更旧的解决方案,不幸的是这对我没有帮助,也许是因为我缺乏更深入的休眠知识?这是我的代码摘要:

public class MyThing {
    public enum MyOptions {
        FLAG1, FLAG2
    }

    @Id
    private Long id;

    @Column(name = "options")
    private EnumSet<MyOptions> options;

    // [other fields, getters, setters etc]
}

我尝试过其他注释,例如

@ElementCollection

有无(targetClass = MyOptions.class)

@JoinTable(name = "my_options",
    joinColumns = @JoinColumn(name = "id"))

还有

@OneToMany
@JoinColumn(name = "options")

但运气不好。

我最好将信息存储在 my_thing table 的新列中,但如果需要,我也可以使用单独的 table 作为枚举。

试试这个

@ElementCollection
@CollectionTable(name = "my_options", 
        joinColumns = @JoinColumn( name = "mything_id"))
@Column(name = "option")
@Enumerated(EnumType.STRING)
private Set<MyOptions> options;

使用此配置,您需要一个名为 my_options 的数据库 table,其中包含列 optionmything_id,目标 MyThing table。